Climate and average weather in Porto Alegre
In Porto Alegre, the summers are humid, hot, showery, and partly cloudy and the winters are mild and partly cloudy.
Over the course of the year, the temperature in Porto Alegre typically varies from 10°C to 30°C, and is rarely below 5°C or above 35°C. January is the hottest month of the year, while July is the coldest.
Based on the travel score, the best time of year to visit Porto Alegre for warm-weather activities is from mid March to early December.
- Hottest
- Jan
- 30°
- Coldest
- Jul
- 10°
- Wettest
- Oct
- 170 mm
- Driest
- Apr
- 106 mm
- Rain / yr
- 1522 mm
- 133 wet days
- Daylight
- 10.1–13.9 h
- shortest–longest
- Elevation
- 46 m
- 30.0°S
- Clearest
- Mar
- 55% cloud
Porto Alegre is human settlement in Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Porto Alegre 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 mid March to early December.
Temperature through the year
Daily average highs and lows in Porto Alegre, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.4 months, from November 19 to April 1, with daily high temperatures above 27°C. The hottest month of the year in Porto Alegre is January, with an average high of 30°C and low of 21°C.
The cool season lasts 2.8 months, from May 22 to August 15, with daily high temperatures below 21°C. The coldest month of the year in Porto Alegre is July, with an average low of 10°C and high of 19°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) | 30 | 30 | 28 | 26 | 22 | 20 | 19 | 21 | 22 | 24 | 27 | 29 |
| Avg low (°C) | 21 | 21 | 20 | 17 | 13 | 11 | 10 | 11 | 13 | 16 | 17 | 20 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 30 | 21 |
| Feb | 30 | 21 |
| Mar | 28 | 20 |
| Apr | 26 | 17 |
| May | 22 | 13 |
| Jun | 20 | 11 |
| Jul | 19 | 10 |
| Aug | 21 | 11 |
| Sep | 22 | 13 |
| Oct | 24 | 16 |
| Nov | 27 | 17 |
| Dec | 29 | 20 |
How hot and cold Porto Alegre 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, Porto Alegre feels like about 32°C (around January 31). About 10 days a year carry some heat stress, peaking in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 32 | 32 | 30 | 26 | 22 | 20 | 19 | 21 | 22 | 24 | 27 | 30 |
| Air high (°C) | 30 | 30 | 28 | 26 | 22 | 20 | 19 | 21 | 22 | 24 | 27 | 29 |
| Feels-like low (°C) | 21 | 21 | 19 | 17 | 13 | 11 | 10 | 11 | 13 | 15 | 17 | 19 |
| Air low (°C) | 21 | 21 | 20 | 17 | 13 | 11 | 10 | 11 | 13 | 16 | 17 | 20 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 32 | 30 | 21 | 21 |
| Feb | 32 | 30 | 21 | 21 |
| Mar | 30 | 28 | 19 | 20 |
| Apr | 26 | 26 | 17 | 17 |
| May | 22 | 22 | 13 | 13 |
| Jun | 20 | 20 | 11 | 11 |
| Jul | 19 | 19 | 10 | 10 |
| Aug | 21 | 21 | 11 | 11 |
| Sep | 22 | 22 | 13 | 13 |
| Oct | 24 | 24 | 15 | 16 |
| Nov | 27 | 27 | 17 | 17 |
| Dec | 30 | 29 | 19 | 20 |
Average hourly temperature in Porto Alegre
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 January afternoons, near 30°C, and coldest before dawn in July, near 10°C.
Porto Alegre 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 | 30° / 21° | 137 | 14.1 | 13.7 | 4.6 |
| Feb | 30° / 21° | 126 | 13.3 | 13.1 | 4.6 |
| Mar | 28° / 20° | 112 | 11.9 | 12.2 | 5.7 |
| Apr | 26° / 17° | 106 | 9.2 | 11.3 | 6.8 |
| May | 22° / 13° | 107 | 9.2 | 10.5 | 6.7 |
| Jun | 20° / 11° | 113 | 9.2 | 10.1 | 6.2 |
| Jul | 19° / 10° | 140 | 10 | 10.3 | 6.1 |
| Aug | 21° / 11° | 120 | 10.2 | 10.9 | 6.5 |
| Sep | 22° / 13° | 146 | 11.1 | 11.8 | 6.4 |
| Oct | 24° / 16° | 170 | 12.5 | 12.7 | 6.4 |
| Nov | 27° / 17° | 123 | 10.8 | 13.5 | 6.4 |
| Dec | 29° / 20° | 125 | 11.7 | 13.9 | 5.2 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Porto Alegre gets about 1522 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 3.6 months, from around Dec 3 to Mar 22, peaking in February at about 48% chance on a given day. The drier stretch runs the rest of the year, bottoming out around May 28.
October is the wettest month by volume, with 170 mm over about 13 wet days; April is the driest, with 106 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 45 | 47 | 39 | 31 | 30 | 31 | 32 | 33 | 38 | 40 | 36 | 38 |
| Rain days | 14 | 13 | 12 | 9 | 9 | 9 | 10 | 10 | 11 | 13 | 11 | 12 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 45 | 14 |
| Feb | 47 | 13 |
| Mar | 39 | 12 |
| Apr | 31 | 9 |
| May | 30 | 9 |
| Jun | 31 | 9 |
| Jul | 32 | 10 |
| Aug | 33 | 10 |
| Sep | 38 | 11 |
| Oct | 40 | 13 |
| Nov | 36 | 11 |
| Dec | 38 | 12 |
Monthly rainfall
Over a full year, Porto Alegre collects about 1522 mm of rain across 133 wet days — roughly 127 mm in an average month.
It doesn’t fall evenly. October is the wettest month with 170 mm, while April is the driest at just 106 mm. The three wettest months alone bring about 30% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 137 | 126 | 112 | 106 | 107 | 113 | 140 | 120 | 146 | 170 | 123 | 125 |
| Rain days | 14 | 13 | 12 | 9 | 9 | 9 | 10 | 10 | 11 | 13 | 11 | 12 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 137 | 14 |
| Feb | 126 | 13 |
| Mar | 112 | 12 |
| Apr | 106 | 9 |
| May | 107 | 9 |
| Jun | 113 | 9 |
| Jul | 140 | 10 |
| Aug | 120 | 10 |
| Sep | 146 | 11 |
| Oct | 170 | 13 |
| Nov | 123 | 11 |
| Dec | 125 | 12 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Porto Alegre, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around November 11 and lasts for 5.4 months, ending around April 22. The clearest month is March, when the sky is clear, mostly clear, or partly cloudy 53% of the time on average.
The cloudier part of the year begins around August 31 and lasts for 2.4 months, ending around November 10. The cloudiest month is October, when it is overcast or mostly cloudy 62% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 51 | 49 | 53 | 49 | 46 | 41 | 46 | 48 | 41 | 38 | 48 | 52 |
| Cloudier (%) | 49 | 51 | 47 | 51 | 54 | 59 | 54 | 52 | 59 | 62 | 52 | 48 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 51 | 49 |
| Feb | 49 | 51 |
| Mar | 53 | 47 |
| Apr | 49 | 51 |
| May | 46 | 54 |
| Jun | 41 | 59 |
| Jul | 46 | 54 |
| Aug | 48 | 52 |
| Sep | 41 | 59 |
| Oct | 38 | 62 |
| Nov | 48 | 52 |
| Dec | 52 | 48 |
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 54 min of light; the shortest, around June 7, only 10 h 06 min — a swing of roughly 3 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.7 | 13.1 | 12.2 | 11.3 | 10.5 | 10.1 | 10.3 | 10.9 | 11.8 | 12.7 | 13.5 | 13.9 |
| Sunrise (AM) | 6:42 | 7:07 | 7:28 | 7:47 | 8:06 | 8:23 | 8:23 | 8:02 | 7:25 | 6:48 | 6:24 | 6:23 |
| Sunset (PM) | 8:26 | 8:12 | 7:41 | 7:03 | 6:36 | 6:28 | 6:38 | 6:56 | 7:14 | 7:32 | 7:56 | 8:19 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 13.7 | 6:42 | 8:26 |
| Feb | 13.1 | 7:07 | 8:12 |
| Mar | 12.2 | 7:28 | 7:41 |
| Apr | 11.3 | 7:47 | 7:03 |
| May | 10.5 | 8:06 | 6:36 |
| Jun | 10.1 | 8:23 | 6:28 |
| Jul | 10.3 | 8:23 | 6:38 |
| Aug | 10.9 | 8:02 | 6:56 |
| Sep | 11.8 | 7:25 | 7:14 |
| Oct | 12.7 | 6:48 | 7:32 |
| Nov | 13.5 | 6:24 | 7:56 |
| Dec | 13.9 | 6:23 | 8:19 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Porto Alegre averages about 9 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 7 and 11 days.
The sunnier stretch runs 2.5 months, from around Nov 3 to Jan 18. The sunniest month is November, with roughly 10 sunny days (mixed).
The greyest month is October, down near 8 sunny days — about 28% fewer than the November peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 10 | 8 | 11 | 10 | 9 | 8 | 10 | 11 | 9 | 8 | 10 | 11 |
| Sky | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Gloomy | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 10 | Mixed |
| Feb | 8 | Mixed |
| Mar | 11 | Mixed |
| Apr | 10 | Mixed |
| May | 9 | Mixed |
| Jun | 8 | Mixed |
| Jul | 10 | Mixed |
| Aug | 11 | Mixed |
| Sep | 9 | Mixed |
| Oct | 8 | Gloomy |
| Nov | 10 | Mixed |
| Dec | 11 | Mixed |
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 Porto Alegre, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 6.2 months, from around October 21 to April 27. The muggiest month is January, when the air feels humid, muggy or worse about 94% of the time.
The most comfortable stretch runs from around April 28 to October 20, and July is the most comfortable month — the air is dry or comfortable 89% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 1 | 1 | 2 | 13 | 36 | 54 | 61 | 52 | 40 | 22 | 11 | 4 |
| Comfortable (%) | 5 | 5 | 9 | 20 | 30 | 27 | 28 | 31 | 28 | 27 | 25 | 13 |
| Humid (%) | 18 | 18 | 24 | 32 | 26 | 17 | 11 | 16 | 26 | 29 | 31 | 26 |
| Muggy (%) | 37 | 34 | 39 | 28 | 8 | 2 | 0 | 1 | 6 | 21 | 28 | 36 |
| Oppressive (%) | 38 | 40 | 25 | 7 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 20 |
| Miserable (%) | 2 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| Jan | 1 | 5 | 18 | 37 | 38 | 2 |
| Feb | 1 | 5 | 18 | 34 | 40 | 3 |
| Mar | 2 | 9 | 24 | 39 | 25 | 1 |
| Apr | 13 | 20 | 32 | 28 | 7 | 0 |
| May | 36 | 30 | 26 | 8 | 0 | 0 |
| Jun | 54 | 27 | 17 | 2 | 0 | 0 |
| Jul | 61 | 28 | 11 | 0 | 0 | 0 |
| Aug | 52 | 31 | 16 | 1 | 0 | 0 |
| Sep | 40 | 28 | 26 | 6 | 0 | 0 |
| Oct | 22 | 27 | 29 | 21 | 1 | 0 |
| Nov | 11 | 25 | 31 | 28 | 5 | 0 |
| Dec | 4 | 13 | 26 | 36 | 20 | 0 |
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 Porto Alegre is steady company: average speeds sit near 11 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) | 11 | 10 | 10 | 10 | 9 | 10 | 10 | 10 | 12 | 12 | 12 | 12 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 11 | calm |
| Feb | 10 | calm |
| Mar | 10 | calm |
| Apr | 10 | calm |
| May | 9 | calm |
| Jun | 10 | calm |
| Jul | 10 | calm |
| Aug | 10 | calm |
| Sep | 12 | calm |
| Oct | 12 | calm |
| Nov | 12 | calm |
| Dec | 12 | calm |
Best time to visit Porto Alegre
To characterize how pleasant the weather is in Porto Alegre throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late November, Porto Alegre 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 Porto Alegre for general outdoor tourist activities is from mid March to early December, with a peak score in the last week of April.
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) | 4.6 | 4.7 | 5.7 | 6.8 | 6.7 | 6.2 | 6.1 | 6.5 | 6.4 | 6.4 | 6.3 | 5.3 |
| Rating | fair | fair | good | good | good | good | good | good | good | good | good | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 4.6 | fair |
| Feb | 4.7 | fair |
| Mar | 5.7 | good |
| Apr | 6.8 | good |
| May | 6.7 | good |
| Jun | 6.2 | good |
| Jul | 6.1 | good |
| Aug | 6.5 | good |
| Sep | 6.4 | good |
| Oct | 6.4 | good |
| Nov | 6.3 | good |
| Dec | 5.3 | 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 Porto Alegre for hot-weather activities is from mid October to early May, with a peak score in the second week of December.
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 Porto Alegre, 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.
For a warm-season trip around January (highs near 30°C), the essentials are light clothes, rain gear and sun protection. In the cold season around July (highs near 19°C), pack rain gear.
In January, Porto Alegre sees daytime highs around 30°C and nights near 21°C. Pack light clothes, rain gear and sun protection. About 14 days see rain.
Sea temperature near Porto Alegre
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 39 km away) is warmest in February at about 26°C and coldest in July near 15°C.
It's comfortable for a long swim from Oct 23 to May 10 — about 6.6 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 26 | 26 | 25 | 23 | 19 | 17 | 15 | 16 | 17 | 20 | 22 | 24 |
| Comfort | Warm | Warm | Warm | Refreshing | Cool | Cool | Cool | Cool | Cool | Cool | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 26 | Warm |
| Feb | 26 | Warm |
| Mar | 25 | Warm |
| Apr | 23 | Refreshing |
| May | 19 | Cool |
| Jun | 17 | Cool |
| Jul | 15 | Cool |
| Aug | 16 | Cool |
| Sep | 17 | Cool |
| Oct | 20 | Cool |
| Nov | 22 | Refreshing |
| Dec | 24 | Warm |
UV index (midday) in Porto Alegre 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 Porto Alegre peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (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) | 13 | 12 | 10 | 7 | 4 | 3 | 4 | 5 | 8 | 8 | 11 | 12 |
| Level | Extreme | Extreme | Very high | Very high | Moderate | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 12 | Extreme |
| Mar | 10 | Very high |
| Apr | 7 | Very high |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 4 | Moderate |
| Aug | 5 | Moderate |
| Sep | 8 | Very high |
| Oct | 8 | Very high |
| Nov | 11 | Extreme |
| Dec | 12 | Extreme |
Average hourly UV index in Porto Alegre
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 6.5 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 | 7.5 | 6 | 4 | 2.5 | 3 | 5 | 6.5 | 7 | 8.5 | 9 |
| UV ≥ 6 (h/day) | 6.5 | 6.5 | 5 | 3 | 0 | 0 | 0 | 0 | 3.5 | 4 | 6 | 6.5 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 9 | 6.5 |
| Feb | 8.5 | 6.5 |
| Mar | 7.5 | 5 |
| Apr | 6 | 3 |
| May | 4 | 0 |
| Jun | 2.5 | 0 |
| Jul | 3 | 0 |
| Aug | 5 | 0 |
| Sep | 6.5 | 3.5 |
| Oct | 7 | 4 |
| Nov | 8.5 | 6 |
| Dec | 9 | 6.5 |
Air quality in Porto Alegre 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 Porto Alegre is worst in August — around 27 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 13 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 13 | 13 | 15 | 18 | 21 | 23 | 25 | 27 | 23 | 16 | 15 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 15 | Moderate |
| Apr | 18 | Moderate |
| May | 21 | Moderate |
| Jun | 23 | Moderate |
| Jul | 25 | Moderate |
| Aug | 27 | Moderate |
| Sep | 23 | Moderate |
| Oct | 16 | Moderate |
| Nov | 15 | Moderate |
| Dec | 13 | Moderate |
Growing season
Porto Alegre 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 | 99 | 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 | 99 | 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. Porto Alegre banks about 3,735 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 477 | 425 | 432 | 333 | 234 | 161 | 142 | 191 | 229 | 307 | 361 | 443 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 477 |
| Feb | 425 |
| Mar | 432 |
| Apr | 333 |
| May | 234 |
| Jun | 161 |
| Jul | 142 |
| Aug | 191 |
| Sep | 229 |
| Oct | 307 |
| Nov | 361 |
| Dec | 443 |
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.
Porto Alegre receives about 4.5 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.3 and 6.6 kWh/m².
The brighter stretch of the year lasts 5.9 months, from around Oct 2 to Mar 29. The brightest month is December, averaging about 6.5 kWh/m² (intense).
The dimmest month is June, down near 2.4 kWh/m² — roughly 63% less than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.3 | 5.7 | 4.9 | 3.8 | 2.9 | 2.4 | 2.6 | 3.4 | 4.1 | 4.9 | 6.1 | 6.6 |
| Level | Intense | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Bright | Bright | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 6.3 | Intense |
| Feb | 5.7 | Bright |
| Mar | 4.9 | Bright |
| Apr | 3.8 | Moderate |
| May | 2.9 | Moderate |
| Jun | 2.4 | Moderate |
| Jul | 2.6 | Moderate |
| Aug | 3.4 | Moderate |
| Sep | 4.1 | Bright |
| Oct | 4.9 | Bright |
| Nov | 6.1 | Intense |
| Dec | 6.6 | Intense |
Where is Porto Alegre?
Porto Alegre sits at 30.0°S, 51.2°W, 46 m above sea level, in Brazil. The nearest listed city is Guaíba, 13 km away.
Topography around Porto Alegre
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Porto Alegre.
Within 3 km, the terrain around Porto Alegre has only modest variations in elevation — a maximum elevation change of 86 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 311 m; within 80 km, large variations in elevation — a maximum elevation change of 883 m.
The land around Porto Alegre is covered by artificial surfaces (42%) and water (35%) within 3 km, artificial surfaces (29%) and trees (26%) within 16 km, and trees (43%) and grassland (21%) 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 Porto Alegre (-30.0328°, -51.2302°, elevation 46 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).