Porto Alegre weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: February – December
What is the weather like in Porto Alegre in August?
In August, Porto Alegre is mild: daytime highs average 20 °C, and nights cool down to about 11 °C. The sea averages 15.7 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 117 mm in total. All in all, August is a good month for a holiday in Porto Alegre.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 73 | 73 | 71 |
| Day | 18° | 20° | 21° |
| Night | 10° | 11° | 13° |
| Sea | 15° | 16° | 17° |
| Sun | 4 h | 5 h | 5 h |
| Rain days | 9 | 10 | 11 |
More details for August
- Daylight
- 11 h 0 min07:00 – 18:00
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 56 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Time zone
- UTC−3America/Sao_Paulo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %30 %
- Few rainy daysweight 30 %55 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Porto Alegre in August: quick answers
Is Porto Alegre hot in August?
No. In August, Porto Alegre is mild: daytime highs average 20 °C and nights drop to about 11 °C.
Can you swim in Porto Alegre in August?
Only if you don't mind cold water: in August the sea averages just 15.7 °C. Comfortable swimming is possible from November to April.
Does it rain much in Porto Alegre in August?
Rain is frequent, with about 10 rainy days and 117 mm in total.
Porto Alegre month by month
The whole year in Porto AlegreAll destinations: BrazilWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences