Climate and average weather in Castelo
In Castelo, the weather is humid, hot, wet, and partly cloudy and remarkably steady, with daytime highs holding near hot levels all year. The wettest stretch peaks around December.
Over the course of the year, the temperature in Castelo typically varies from 14°C to 29°C, and is rarely below 11°C or above 32°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 Castelo for warm-weather activities is from late April to late September.
- Hottest
- Feb
- 29°
- Coldest
- Jul
- 14°
- Wettest
- Dec
- 224 mm
- Driest
- Jun
- 23 mm
- Rain / yr
- 1201 mm
- 140 wet days
- Daylight
- 10.7–13.3 h
- shortest–longest
- Elevation
- 129 m
- 20.6°S
- Clearest
- Aug
- 49% cloud
Castelo is human settlement in Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Castelo 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 Castelo, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Castelo stay fairly even through the year, without a distinct hot or cool season. The warmest month is February, with an average high of 29°C and low of 20°C; the coolest is July, with an average low of 14°C and high of 24°C.
Days typically run about 9°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 28 | 27 | 25 | 24 | 24 | 24 | 26 | 26 | 26 | 28 |
| Avg low (°C) | 20 | 20 | 19 | 18 | 16 | 14 | 14 | 14 | 16 | 17 | 18 | 19 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 29 | 20 |
| Feb | 29 | 20 |
| Mar | 28 | 19 |
| Apr | 27 | 18 |
| May | 25 | 16 |
| Jun | 24 | 14 |
| Jul | 24 | 14 |
| Aug | 24 | 14 |
| Sep | 26 | 16 |
| Oct | 26 | 17 |
| Nov | 26 | 18 |
| Dec | 28 | 19 |
Average hourly temperature in Castelo
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 29°C, and coldest before dawn in July, near 14°C.
Castelo 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 | 29° / 20° | 148 | 14.1 | 13.1 | 4.9 |
| Feb | 29° / 20° | 107 | 11.9 | 12.7 | 4.8 |
| Mar | 28° / 19° | 159 | 16.6 | 12.1 | 5.0 |
| Apr | 27° / 18° | 88 | 13.4 | 11.5 | 6.0 |
| May | 25° / 16° | 43 | 8.6 | 11 | 7.1 |
| Jun | 24° / 14° | 23 | 5.5 | 10.8 | 7.8 |
| Jul | 24° / 14° | 24 | 6 | 10.9 | 7.8 |
| Aug | 24° / 14° | 26 | 6.5 | 11.3 | 7.7 |
| Sep | 26° / 16° | 58 | 9.3 | 11.9 | 6.9 |
| Oct | 26° / 17° | 110 | 12.3 | 12.5 | 6.1 |
| Nov | 26° / 18° | 191 | 17.1 | 13 | 5.2 |
| Dec | 28° / 19° | 224 | 19 | 13.2 | 4.8 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Castelo gets about 1201 mm of precipitation a year. On a typical day the chance of rain is often wet, but that rises and falls sharply with the seasons.
The wetter season lasts 6.2 months, from around Oct 18 to Apr 23, peaking in December at about 63% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 25.
December is the wettest month by volume, with 224 mm over about 19 wet days; June is the driest, with 23 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 46 | 43 | 53 | 43 | 29 | 19 | 19 | 21 | 30 | 40 | 57 | 60 |
| Rain days | 14 | 12 | 17 | 13 | 9 | 6 | 6 | 7 | 9 | 12 | 17 | 19 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 46 | 14 |
| Feb | 43 | 12 |
| Mar | 53 | 17 |
| Apr | 43 | 13 |
| May | 29 | 9 |
| Jun | 19 | 6 |
| Jul | 19 | 6 |
| Aug | 21 | 7 |
| Sep | 30 | 9 |
| Oct | 40 | 12 |
| Nov | 57 | 17 |
| Dec | 60 | 19 |
Monthly rainfall
Over a full year, Castelo collects about 1201 mm of rain across 140 wet days — roughly 100 mm in an average month.
It doesn’t fall evenly. December is the wettest month with 224 mm, while June is the driest at just 23 mm. The three wettest months alone bring about 48% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 148 | 107 | 159 | 88 | 43 | 23 | 24 | 26 | 58 | 110 | 191 | 224 |
| Rain days | 14 | 12 | 17 | 13 | 9 | 6 | 6 | 7 | 9 | 12 | 17 | 19 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 148 | 14 |
| Feb | 107 | 12 |
| Mar | 159 | 17 |
| Apr | 88 | 13 |
| May | 43 | 9 |
| Jun | 23 | 6 |
| Jul | 24 | 6 |
| Aug | 26 | 7 |
| Sep | 58 | 9 |
| Oct | 110 | 12 |
| Nov | 191 | 17 |
| Dec | 224 | 19 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Castelo, 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 10 and lasts for 5.5 months, ending around September 22. The clearest month is June, when the sky is clear, mostly clear, or partly cloudy 59% of the time on average.
The cloudier part of the year begins around September 23 and lasts for 6.5 months, ending around April 9. The cloudiest month is November, when it is overcast or mostly cloudy 79% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 33 | 39 | 38 | 47 | 50 | 59 | 57 | 58 | 49 | 33 | 21 | 25 |
| Cloudier (%) | 67 | 61 | 62 | 53 | 50 | 41 | 43 | 42 | 51 | 67 | 79 | 75 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 33 | 67 |
| Feb | 39 | 61 |
| Mar | 38 | 62 |
| Apr | 47 | 53 |
| May | 50 | 50 |
| Jun | 59 | 41 |
| Jul | 57 | 43 |
| Aug | 58 | 42 |
| Sep | 49 | 51 |
| Oct | 33 | 67 |
| Nov | 21 | 79 |
| Dec | 25 | 75 |
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 December 21, brings about 13 h 18 min of light; the shortest, around June 21, only 10 h 42 min — a swing of roughly 2 h 36 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.1 | 12.7 | 12.1 | 11.5 | 11.0 | 10.8 | 10.9 | 11.3 | 11.9 | 12.5 | 13.0 | 13.2 |
| Sunrise (AM) | 6:20 | 6:38 | 6:50 | 6:59 | 7:10 | 7:22 | 7:25 | 7:10 | 6:43 | 6:15 | 6:00 | 6:04 |
| Sunset (PM) | 7:28 | 7:20 | 6:59 | 6:31 | 6:12 | 6:08 | 6:16 | 6:28 | 6:36 | 6:44 | 7:00 | 7:18 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 13.1 | 6:20 | 7:28 |
| Feb | 12.7 | 6:38 | 7:20 |
| Mar | 12.1 | 6:50 | 6:59 |
| Apr | 11.5 | 6:59 | 6:31 |
| May | 11.0 | 7:10 | 6:12 |
| Jun | 10.8 | 7:22 | 6:08 |
| Jul | 10.9 | 7:25 | 6:16 |
| Aug | 11.3 | 7:10 | 6:28 |
| Sep | 11.9 | 6:43 | 6:36 |
| Oct | 12.5 | 6:15 | 6:44 |
| Nov | 13.0 | 6:00 | 7:00 |
| Dec | 13.2 | 6:04 | 7:18 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Castelo averages about 8 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 2 and 13 days.
The sunnier stretch runs 5.3 months, from around Apr 20 to Sep 27. The sunniest month is September, with roughly 10 sunny days (mixed).
The greyest month is November, down near 3 sunny days — about 74% fewer than the September peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 5 | 6 | 6 | 7 | 9 | 11 | 12 | 13 | 10 | 6 | 3 | 4 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Mixed | Mixed | Mixed | Mixed | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 5 | Gloomy |
| Feb | 6 | Gloomy |
| Mar | 6 | Gloomy |
| Apr | 7 | Gloomy |
| May | 9 | Mixed |
| Jun | 11 | Mixed |
| Jul | 12 | Mixed |
| Aug | 13 | Mixed |
| Sep | 10 | Mixed |
| Oct | 6 | Gloomy |
| Nov | 3 | 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 Castelo, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 6.7 months, from around October 18 to May 10. The muggiest month is March, when the air feels humid, muggy or worse about 99% of the time.
The most comfortable stretch runs from around May 11 to October 17, and July is the most comfortable month — the air is dry or comfortable 83% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 4 | 10 | 18 | 22 | 12 | 4 | 1 | 0 |
| Comfortable (%) | 1 | 1 | 1 | 9 | 32 | 55 | 65 | 59 | 45 | 27 | 9 | 1 |
| Humid (%) | 26 | 27 | 20 | 35 | 54 | 34 | 17 | 19 | 38 | 50 | 43 | 25 |
| Muggy (%) | 67 | 68 | 74 | 55 | 10 | 0 | 0 | 0 | 5 | 20 | 47 | 69 |
| Oppressive (%) | 5 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 0 | 1 | 26 | 67 | 5 |
| Feb | 0 | 1 | 27 | 68 | 5 |
| Mar | 0 | 1 | 20 | 74 | 4 |
| Apr | 0 | 9 | 35 | 55 | 1 |
| May | 4 | 32 | 54 | 10 | 0 |
| Jun | 10 | 55 | 34 | 0 | 0 |
| Jul | 18 | 65 | 17 | 0 | 0 |
| Aug | 22 | 59 | 19 | 0 | 0 |
| Sep | 12 | 45 | 38 | 5 | 0 |
| Oct | 4 | 27 | 50 | 20 | 0 |
| Nov | 1 | 9 | 43 | 47 | 1 |
| Dec | 0 | 1 | 25 | 69 | 4 |
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 Castelo 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) | 7 | 6 | 6 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 7 | calm |
| Feb | 6 | calm |
| Mar | 6 | calm |
| Apr | 5 | calm |
| May | 6 | calm |
| Jun | 6 | calm |
| Jul | 6 | calm |
| Aug | 7 | calm |
| Sep | 7 | calm |
| Oct | 7 | calm |
| Nov | 7 | calm |
| Dec | 7 | calm |
Hazard calendar for Castelo
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Castelo's rainy season runs October–March, when most of the year's rain falls.
Best time to visit Castelo
To characterize how pleasant the weather is in Castelo throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late September, Castelo is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
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 Castelo for general outdoor tourist activities is from late April to early October, with a peak score in the third week of June.
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) | 4.8 | 4.8 | 5.0 | 6.0 | 7.1 | 7.8 | 7.8 | 7.7 | 6.9 | 6.1 | 5.2 | 4.8 |
| Rating | fair | fair | fair | good | good | ideal | ideal | ideal | good | good | fair | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 4.8 | fair |
| Feb | 4.8 | fair |
| Mar | 5.0 | fair |
| Apr | 6.0 | good |
| May | 7.1 | good |
| Jun | 7.8 | ideal |
| Jul | 7.8 | ideal |
| Aug | 7.7 | ideal |
| Sep | 6.9 | good |
| Oct | 6.1 | good |
| Nov | 5.2 | fair |
| Dec | 4.8 | 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 Castelo for hot-weather activities is from late December to late October, with a peak score in the first week of September.
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 Castelo, 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.
Castelo packs about the same all year — highs hold near 29°C. Across the year the things worth having are light clothes, rain gear and sun protection.
In February, Castelo sees daytime highs around 29°C and nights near 20°C. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.
Sea temperature near Castelo
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 66 km away) is warmest in March at about 25°C and coldest in September near 22°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) | 24 | 25 | 25 | 25 | 25 | 23 | 23 | 23 | 22 | 23 | 24 | 24 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Warm |
| Feb | 25 | Warm |
| Mar | 25 | Warm |
| Apr | 25 | Warm |
| May | 25 | Warm |
| Jun | 23 | Refreshing |
| Jul | 23 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 22 | Refreshing |
| Oct | 23 | Refreshing |
| Nov | 24 | Refreshing |
| Dec | 24 | Warm |
UV index (midday) in Castelo 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 Castelo peaks around February 11 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 6 (high).
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 | 15 | 13 | 10 | 7 | 6 | 7 | 9 | 10 | 12 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | Very high | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 15 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| May | 7 | Very high |
| Jun | 6 | High |
| Jul | 7 | High |
| Aug | 9 | Very high |
| Sep | 10 | Very high |
| Oct | 12 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Average hourly UV index in Castelo
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 February the burn window is concentrated in the middle of the day: about 8.5 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) | 8.5 | 8.5 | 8 | 7 | 6 | 5.5 | 5.5 | 6.5 | 7.5 | 8 | 8.5 | 9 |
| UV ≥ 6 (h/day) | 7 | 7 | 6 | 5 | 3 | 2 | 2.5 | 4 | 5 | 6 | 6.5 | 7 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 8.5 | 7 |
| Feb | 8.5 | 7 |
| Mar | 8 | 6 |
| Apr | 7 | 5 |
| May | 6 | 3 |
| Jun | 5.5 | 2 |
| Jul | 5.5 | 2.5 |
| Aug | 6.5 | 4 |
| Sep | 7.5 | 5 |
| Oct | 8 | 6 |
| Nov | 8.5 | 6.5 |
| Dec | 9 | 7 |
Growing season
Castelo 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. Castelo banks about 4,237 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) | 443 | 406 | 424 | 363 | 310 | 275 | 271 | 286 | 316 | 362 | 365 | 416 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 443 |
| Feb | 406 |
| Mar | 424 |
| Apr | 363 |
| May | 310 |
| Jun | 275 |
| Jul | 271 |
| Aug | 286 |
| Sep | 316 |
| Oct | 362 |
| Nov | 365 |
| Dec | 416 |
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.
Castelo receives about 4.7 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.5 and 6.0 kWh/m².
The brighter stretch of the year lasts 6.9 months, from around Sep 4 to Mar 31. The brightest month is February, averaging about 5.9 kWh/m² (bright).
The dimmest month is June, down near 3.5 kWh/m² — roughly 40% less than the February peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.9 | 6.0 | 5.1 | 4.3 | 3.7 | 3.5 | 3.6 | 4.3 | 4.8 | 5.1 | 4.9 | 5.4 |
| Level | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 5.9 | Bright |
| Feb | 6.0 | Bright |
| Mar | 5.1 | Bright |
| Apr | 4.3 | Bright |
| May | 3.7 | Moderate |
| Jun | 3.5 | Moderate |
| Jul | 3.6 | Moderate |
| Aug | 4.3 | Bright |
| Sep | 4.8 | Bright |
| Oct | 5.1 | Bright |
| Nov | 4.9 | Bright |
| Dec | 5.4 | Bright |
Where is Castelo?
Castelo sits at 20.6°S, 41.2°W, 129 m above sea level, in Brazil. The nearest listed city is Vargem Alta, 20 km away.
Topography around Castelo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castelo.
Within 3 km, the terrain around Castelo has large variations in elevation — a maximum elevation change of 768 m around an average of 224 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,935 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,841 m.
The land around Castelo is covered by trees (56%) and grassland (37%) within 3 km, trees (53%) and grassland (46%) within 16 km, and trees (50%) and grassland (41%) 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 Castelo (-20.6036°, -41.1847°, elevation 129 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).