Porto Alegre weather in August
In August, Porto Alegre has daytime highs averaging 21 °C, nights around 11 °C, with 10 wet days. Figures are 1991–2020 climate normals.
- 20.7°C Average high
- 11.2°C Average low
- 10days Wet days
- 122mm Rainfall
- 11h Daylight
Daily temperatures through August
How August develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 August | 19.5 °C | 10.4 °C | 34 % |
| 11–20 August | 20.7 °C | 11.2 °C | 30 % |
| 21–31 August | 21.7 °C | 11.9 °C | 32 % |
- Average highs rise from 19.5 °C early in August to 21.7 °C by the end of it.
What to expect
| Measure | Typical August | Share of the month |
|---|---|---|
| Days above 25 °C | 6.4 of 31 | 21 % |
| Days above 30 °C | 0.8 of 31 | 2 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 10 of 31 | 32 % |
Conditions in August
| Measure | Average |
|---|---|
| Mean temperature | 15 °C |
| Record high (1991–2020) | 32 °C |
| Record low (1991–2020) | 0.1 °C |
| Relative humidity | 81 % |
| Wind speed | 16 km/h |
| Cloud cover | 56 % |
August compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| June | 19.2 °C | 118 mm | 63 % |
| July | 18.6 °C | 140 mm | 59 % |
| August | 20.7 °C | 122 mm | 56 % |
| September | 21.7 °C | 149 mm | 61 % |
| October | 23.9 °C | 173 mm | 64 % |
See all twelve months for Porto Alegre
- August is the 10th warmest month here.
- It is the 5th driest month of the year.
- It ranks 7th for least cloud cover.
- Days last about 11 hours from sunrise to sunset.
- It rains on 10 of 31 days — 32 % of the month.
- Nights are about 9.5 °C cooler than the middle of the day.
- The hottest August day on record since 1991 reached 32 °C, 11 °C above the usual daytime high.
QuestionsAugust in Porto Alegre, answered
How warm is Porto Alegre in August?
Daily highs average 21 °C and nights fall to about 11 °C, a spread of 9.5 °C between afternoon and dawn. That makes August the 10th warmest month of the year here.
Does it rain much in Porto Alegre in August?
August averages 122 mm of rain, spread over about 10 of the 31 days — 32 % of the month. Cloud cover averages 56 % of the sky.
How long are the days in August?
Porto Alegre averages 11 hours between sunrise and sunset in August. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.