Climate and average weather in São João de Meriti
In São João de Meriti, the weather is muggy, hot, wet, and partly cloudy and remarkably steady, with daytime highs holding near hot levels all year. The wettest stretch peaks around January.
Over the course of the year, the temperature in São João de Meriti typically varies from 16°C to 32°C, and is rarely below 13°C or above 36°C. February is the hottest month of the year, while July is the coldest.
Based on the travel score, the best time of year to visit São João de Meriti for warm-weather activities is from late April to late September.
- Hottest
- Feb
- 32°
- Coldest
- Jul
- 16°
- Wettest
- Jan
- 266 mm
- Driest
- Aug
- 44 mm
- Rain / yr
- 1652 mm
- 172 wet days
- Daylight
- 10.6–13.4 h
- shortest–longest
- Elevation
- 14 m
- 22.8°S
- Clearest
- Jul
- 44% cloud
São João de Meriti is human settlement in Brazil.
- Air quality
- Moderate
- PM2.5 12 µg/m³ · 2015
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
São João de Meriti weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around late April to late September.
Temperature through the year
Daily average highs and lows in São João de Meriti, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in São João de Meriti stay fairly even through the year, without a distinct hot or cool season. The warmest month is February, with an average high of 32°C and low of 23°C; the coolest is July, with an average low of 16°C and high of 26°C.
Days typically run about 8°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 32 | 30 | 29 | 26 | 26 | 26 | 26 | 27 | 28 | 28 | 30 |
| Avg low (°C) | 23 | 23 | 22 | 21 | 18 | 17 | 16 | 17 | 18 | 20 | 21 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 31 | 23 |
| Feb | 32 | 23 |
| Mar | 30 | 22 |
| Apr | 29 | 21 |
| May | 26 | 18 |
| Jun | 26 | 17 |
| Jul | 26 | 16 |
| Aug | 26 | 17 |
| Sep | 27 | 18 |
| Oct | 28 | 20 |
| Nov | 28 | 21 |
| Dec | 30 | 22 |
How hot and cold São João de Meriti really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, São João de Meriti feels like about 36°C (around February 10). About 117 days a year carry some heat stress, peaking in February.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 35 | 36 | 34 | 31 | 27 | 26 | 26 | 26 | 28 | 29 | 30 | 33 |
| Air high (°C) | 31 | 32 | 30 | 29 | 26 | 26 | 26 | 26 | 27 | 28 | 28 | 30 |
| Feels-like low (°C) | 23 | 23 | 22 | 21 | 18 | 17 | 16 | 17 | 18 | 20 | 21 | 22 |
| Air low (°C) | 23 | 23 | 22 | 21 | 18 | 17 | 16 | 17 | 18 | 20 | 21 | 22 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 35 | 31 | 23 | 23 |
| Feb | 36 | 32 | 23 | 23 |
| Mar | 34 | 30 | 22 | 22 |
| Apr | 31 | 29 | 21 | 21 |
| May | 27 | 26 | 18 | 18 |
| Jun | 26 | 26 | 17 | 17 |
| Jul | 26 | 26 | 16 | 16 |
| Aug | 26 | 26 | 17 | 17 |
| Sep | 28 | 27 | 18 | 18 |
| Oct | 29 | 28 | 20 | 20 |
| Nov | 30 | 28 | 21 | 21 |
| Dec | 33 | 30 | 22 | 22 |
Average hourly temperature in São João de Meriti
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on February afternoons, near 32°C, and coldest before dawn in July, near 16°C.
São João de Meriti weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 31° / 23° | 266 | 21.3 | 13.2 | 3.2 |
| Feb | 32° / 23° | 197 | 17.8 | 12.8 | 3.3 |
| Mar | 30° / 22° | 216 | 21.1 | 12.2 | 3.7 |
| Apr | 29° / 21° | 106 | 13.5 | 11.5 | 5.2 |
| May | 26° / 18° | 74 | 11.1 | 10.9 | 6.6 |
| Jun | 26° / 17° | 47 | 7.1 | 10.6 | 7.3 |
| Jul | 26° / 16° | 47 | 7.2 | 10.7 | 7.4 |
| Aug | 26° / 17° | 44 | 7.5 | 11.2 | 7.2 |
| Sep | 27° / 18° | 87 | 11.1 | 11.9 | 6.3 |
| Oct | 28° / 20° | 120 | 14.4 | 12.5 | 5.3 |
| Nov | 28° / 21° | 213 | 19 | 13.1 | 4.4 |
| Dec | 30° / 22° | 237 | 21.2 | 13.4 | 3.6 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
São João de Meriti gets about 1652 mm of precipitation a year. On a typical day the chance of rain is very wet, but that rises and falls sharply with the seasons.
The wetter season lasts 5.7 months, from around Oct 20 to Apr 11, peaking in December at about 73% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 22.
January is the wettest month by volume, with 266 mm over about 21 wet days; August is the driest, with 44 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 69 | 64 | 67 | 46 | 36 | 24 | 23 | 25 | 36 | 47 | 63 | 68 |
| Rain days | 21 | 18 | 21 | 14 | 11 | 7 | 7 | 8 | 11 | 14 | 19 | 21 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 69 | 21 |
| Feb | 64 | 18 |
| Mar | 67 | 21 |
| Apr | 46 | 14 |
| May | 36 | 11 |
| Jun | 24 | 7 |
| Jul | 23 | 7 |
| Aug | 25 | 8 |
| Sep | 36 | 11 |
| Oct | 47 | 14 |
| Nov | 63 | 19 |
| Dec | 68 | 21 |
Monthly rainfall
Over a full year, São João de Meriti collects about 1652 mm of rain across 172 wet days — roughly 138 mm in an average month.
It doesn’t fall evenly. January is the wettest month with 266 mm, while August is the driest at just 44 mm. The three wettest months alone bring about 43% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 266 | 197 | 216 | 106 | 74 | 47 | 47 | 44 | 87 | 120 | 213 | 237 |
| Rain days | 21 | 18 | 21 | 14 | 11 | 7 | 7 | 8 | 11 | 14 | 19 | 21 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 266 | 21 |
| Feb | 197 | 18 |
| Mar | 216 | 21 |
| Apr | 106 | 14 |
| May | 74 | 11 |
| Jun | 47 | 7 |
| Jul | 47 | 7 |
| Aug | 44 | 8 |
| Sep | 87 | 11 |
| Oct | 120 | 14 |
| Nov | 213 | 19 |
| Dec | 237 | 21 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In São João de Meriti, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around April 1 and lasts for 5.5 months, ending around September 15. The clearest month is June, when the sky is clear, mostly clear, or partly cloudy 64% of the time on average.
The cloudier part of the year begins around September 16 and lasts for 6.5 months, ending around March 31. The cloudiest month is November, when it is overcast or mostly cloudy 71% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 32 | 41 | 43 | 56 | 58 | 64 | 62 | 63 | 47 | 33 | 29 | 29 |
| Cloudier (%) | 68 | 59 | 57 | 44 | 42 | 36 | 38 | 37 | 53 | 67 | 71 | 71 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 32 | 68 |
| Feb | 41 | 59 |
| Mar | 43 | 57 |
| Apr | 56 | 44 |
| May | 58 | 42 |
| Jun | 64 | 36 |
| Jul | 62 | 38 |
| Aug | 63 | 37 |
| Sep | 47 | 53 |
| Oct | 33 | 67 |
| Nov | 29 | 71 |
| Dec | 29 | 71 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around January 1, brings about 13 h 24 min of light; the shortest, around June 8, only 10 h 36 min — a swing of roughly 2 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.2 | 12.8 | 12.2 | 11.5 | 10.9 | 10.6 | 10.7 | 11.2 | 11.9 | 12.5 | 13.1 | 13.4 |
| Sunrise (AM) | 6:25 | 6:45 | 6:58 | 7:10 | 7:23 | 7:35 | 7:37 | 7:21 | 6:52 | 6:22 | 6:05 | 6:08 |
| Sunset (PM) | 7:41 | 7:32 | 7:08 | 6:38 | 6:17 | 6:12 | 6:21 | 6:34 | 6:44 | 6:55 | 7:12 | 7:31 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 13.2 | 6:25 | 7:41 |
| Feb | 12.8 | 6:45 | 7:32 |
| Mar | 12.2 | 6:58 | 7:08 |
| Apr | 11.5 | 7:10 | 6:38 |
| May | 10.9 | 7:23 | 6:17 |
| Jun | 10.6 | 7:35 | 6:12 |
| Jul | 10.7 | 7:37 | 6:21 |
| Aug | 11.2 | 7:21 | 6:34 |
| Sep | 11.9 | 6:52 | 6:44 |
| Oct | 12.5 | 6:22 | 6:55 |
| Nov | 13.1 | 6:05 | 7:12 |
| Dec | 13.4 | 6:08 | 7:31 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
São João de Meriti averages about 9 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 3 and 15 days.
The sunnier stretch runs 5.4 months, from around Apr 10 to Sep 19. The sunniest month is August, with roughly 15 sunny days (mixed).
The greyest month is December, down near 4 sunny days — about 70% fewer than the August peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 6 | 7 | 8 | 10 | 11 | 14 | 15 | 15 | 10 | 6 | 4 | 4 |
| Sky | Gloomy | Gloomy | Gloomy | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 6 | Gloomy |
| Feb | 7 | Gloomy |
| Mar | 8 | Gloomy |
| Apr | 10 | Mixed |
| May | 11 | Mixed |
| Jun | 14 | Mixed |
| Jul | 15 | Mixed |
| Aug | 15 | Mixed |
| Sep | 10 | Mixed |
| Oct | 6 | Gloomy |
| Nov | 4 | Gloomy |
| Dec | 4 | Gloomy |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In São João de Meriti, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 7.4 months, from around October 9 to May 20. The muggiest month is January, when the air feels humid, muggy or worse about 100% of the time.
The most comfortable stretch runs from around May 21 to October 8, and August is the most comfortable month — the air is dry or comfortable 30% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 4 | 2 | 1 | 0 | 0 |
| Comfortable (%) | 0 | 0 | 0 | 1 | 8 | 15 | 27 | 26 | 14 | 6 | 2 | 0 |
| Humid (%) | 1 | 0 | 1 | 12 | 37 | 53 | 58 | 52 | 46 | 27 | 15 | 4 |
| Muggy (%) | 16 | 15 | 21 | 40 | 47 | 29 | 13 | 18 | 35 | 50 | 45 | 26 |
| Oppressive (%) | 74 | 75 | 72 | 46 | 7 | 0 | 0 | 0 | 2 | 16 | 38 | 67 |
| Miserable (%) | 9 | 9 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| Jan | 0 | 0 | 1 | 16 | 74 | 9 |
| Feb | 0 | 0 | 0 | 15 | 75 | 9 |
| Mar | 0 | 0 | 1 | 21 | 72 | 5 |
| Apr | 0 | 1 | 12 | 40 | 46 | 1 |
| May | 0 | 8 | 37 | 47 | 7 | 0 |
| Jun | 2 | 15 | 53 | 29 | 0 | 0 |
| Jul | 2 | 27 | 58 | 13 | 0 | 0 |
| Aug | 4 | 26 | 52 | 18 | 0 | 0 |
| Sep | 2 | 14 | 46 | 35 | 2 | 0 |
| Oct | 1 | 6 | 27 | 50 | 16 | 0 |
| Nov | 0 | 2 | 15 | 45 | 38 | 0 |
| Dec | 0 | 0 | 4 | 26 | 67 | 3 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Wind in São João de Meriti is steady company: average speeds sit near 6 km/h — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 7 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 5 | calm |
| Feb | 5 | calm |
| Mar | 5 | calm |
| Apr | 5 | calm |
| May | 5 | calm |
| Jun | 5 | calm |
| Jul | 6 | calm |
| Aug | 6 | calm |
| Sep | 7 | calm |
| Oct | 6 | calm |
| Nov | 6 | calm |
| Dec | 6 | calm |
Hazard calendar for São João de Meriti
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
São João de Meriti's rainy season runs October–March, when most of the year's rain falls.
Best time to visit São João de Meriti
To characterize how pleasant the weather is in São João de Meriti throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early May, São João de Meriti is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit São João de Meriti for general outdoor tourist activities is from late April to late September, with a peak score in the last week of July.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 3.2 | 3.3 | 3.7 | 5.2 | 6.5 | 7.3 | 7.4 | 7.2 | 6.4 | 5.3 | 4.4 | 3.7 |
| Rating | poor | poor | fair | fair | good | good | good | good | good | fair | fair | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 3.2 | poor |
| Feb | 3.3 | poor |
| Mar | 3.7 | fair |
| Apr | 5.2 | fair |
| May | 6.5 | good |
| Jun | 7.3 | good |
| Jul | 7.4 | good |
| Aug | 7.2 | good |
| Sep | 6.4 | good |
| Oct | 5.3 | fair |
| Nov | 4.4 | fair |
| Dec | 3.7 | fair |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit São João de Meriti for hot-weather activities is from early April to late October, with a peak score in the third week of June.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for São João de Meriti, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
São João de Meriti packs about the same all year — highs hold near 32°C. Across the year the things worth having are light clothes, rain gear and sun protection.
In February, São João de Meriti sees daytime highs around 32°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.
Sea temperature near São João de Meriti
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea at the nearest coast (about 36 km away) is warmest in March at about 26°C and coldest in August near 21°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 25 | 25 | 26 | 25 | 24 | 23 | 22 | 21 | 21 | 22 | 22 | 24 |
| Comfort | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 25 | Warm |
| Feb | 25 | Warm |
| Mar | 26 | Warm |
| Apr | 25 | Warm |
| May | 24 | Refreshing |
| Jun | 23 | Refreshing |
| Jul | 22 | Refreshing |
| Aug | 21 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 22 | Refreshing |
| Nov | 22 | Refreshing |
| Dec | 24 | Warm |
UV index (midday) in São João de Meriti by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in São João de Meriti peaks around January 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 5 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 14 | 13 | 12 | 9 | 6 | 6 | 5 | 8 | 6 | 11 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | Moderate | Very high | High | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 12 | Extreme |
| Apr | 9 | Very high |
| May | 6 | High |
| Jun | 6 | High |
| Jul | 5 | Moderate |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 11 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Average hourly UV index in São João de Meriti
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in January the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 7 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 9 | 8.5 | 8 | 6.5 | 5.5 | 5 | 4.5 | 6 | 6.5 | 8 | 8.5 | 9 |
| UV ≥ 6 (h/day) | 7 | 6.5 | 6 | 4.5 | 1.5 | 0 | 0 | 3 | 2.5 | 5.5 | 6.5 | 7 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 9 | 7 |
| Feb | 8.5 | 6.5 |
| Mar | 8 | 6 |
| Apr | 6.5 | 4.5 |
| May | 5.5 | 1.5 |
| Jun | 5 | 0 |
| Jul | 4.5 | 0 |
| Aug | 6 | 3 |
| Sep | 6.5 | 2.5 |
| Oct | 8 | 5.5 |
| Nov | 8.5 | 6.5 |
| Dec | 9 | 7 |
Air quality in São João de Meriti by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in São João de Meriti is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 8 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to São João de Meriti's WHO annual average of 12 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 8 | 9 | 11 | 14 | 16 | 17 | 14 | 17 | 11 | 9 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 8 | Good |
| Mar | 9 | Good |
| Apr | 11 | Good |
| May | 14 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 14 | Moderate |
| Sep | 17 | Moderate |
| Oct | 11 | Good |
| Nov | 9 | Good |
| Dec | 8 | Good |
Growing season
São João de Meriti is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. São João de Meriti banks about 5,112 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around February.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 528 | 484 | 505 | 440 | 380 | 342 | 338 | 355 | 377 | 429 | 437 | 499 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 528 |
| Feb | 484 |
| Mar | 505 |
| Apr | 440 |
| May | 380 |
| Jun | 342 |
| Jul | 338 |
| Aug | 355 |
| Sep | 377 |
| Oct | 429 |
| Nov | 437 |
| Dec | 499 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
São João de Meriti receives about 4.6 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.3 and 6.0 kWh/m².
The brighter stretch of the year lasts 6.0 months, from around Sep 30 to Mar 30. The brightest month is February, averaging about 5.8 kWh/m² (bright).
The dimmest month is May, down near 3.5 kWh/m² — roughly 39% less than the February peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.8 | 5.9 | 5.0 | 4.3 | 3.5 | 3.3 | 3.4 | 4.2 | 4.5 | 5.0 | 5.1 | 5.6 |
| Level | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 5.8 | Bright |
| Feb | 5.9 | Bright |
| Mar | 5.0 | Bright |
| Apr | 4.3 | Bright |
| May | 3.5 | Moderate |
| Jun | 3.3 | Moderate |
| Jul | 3.4 | Moderate |
| Aug | 4.2 | Bright |
| Sep | 4.5 | Bright |
| Oct | 5.0 | Bright |
| Nov | 5.1 | Bright |
| Dec | 5.6 | Bright |
Where is São João de Meriti?
São João de Meriti sits at 22.8°S, 43.4°W, 14 m above sea level, in Brazil. The nearest listed city is Nilópolis, 4.0 km away.
Topography around São João de Meriti
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São João de Meriti.
Within 3 km, the terrain around São João de Meriti has only modest variations in elevation — a maximum elevation change of 154 m around an average of 27 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 956 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,224 m.
The land around São João de Meriti is covered by artificial surfaces (88%) within 3 km, artificial surfaces (52%) and trees (28%) within 16 km, and trees (37%), water (31%) and grassland (24%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for São João de Meriti (-22.8039°, -43.3722°, elevation 14 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).