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Porto Alegre weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Porto Alegre?
For a warm holiday, the best week has been 27 November – 3 December (Weather Index 89). Several start dates remain plausible, and the best timing varies between years. January is warmest (31°C), July is driest and November to February have the most sun.
- Warmest
- January 31°C
- Coolest
- June and July 19°C
- Driest
- July 27% rain-day chance
- Wettest
- January 40% rain-day chance
- Sunniest
- November to February 11 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Porto Alegre
Porto Alegre historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 30.7 | 21.3 | 40.3 | 12.5 | 94.5 | 11.4 |
| February | 30.5 | 20.9 | 34.6 | 9.7 | 94.7 | 11.5 |
| March | 28.6 | 19.8 | 35.8 | 11.1 | 120.5 | 9.7 |
| April | 25.7 | 17.3 | 30.3 | 9.1 | 89.6 | 8.7 |
| May | 21.2 | 13.5 | 34.8 | 10.8 | 156.3 | 7.1 |
| June | 19.2 | 11.1 | 28.3 | 8.5 | 128.5 | 6.8 |
| July | 19.1 | 10.4 | 27.4 | 8.5 | 108.6 | 7.4 |
| August | 20.8 | 11.4 | 31.6 | 9.8 | 90.4 | 8.3 |
| September | 22.4 | 14.0 | 38.0 | 11.4 | 170.9 | 8.1 |
| October | 24.3 | 15.6 | 37.1 | 11.5 | 129.7 | 9.1 |
| November | 26.8 | 17.1 | 36.3 | 10.9 | 127.0 | 10.8 |
| December | 29.5 | 19.6 | 33.9 | 10.5 | 111.4 | 11.5 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.