Climate averages 1991–2020
Rio Grande weather
in August.
A mild, wet month: the 11th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Rio Grande: daytime highs average 15.8°C and nights cool to about 12.5°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 108 mm of rain on roughly 10 days, which makes August a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 57 min on an average August day.
The nearest other city in this atlas is Pelotas (37 km away). In August its highs average 17.6°C, 1.8°C warmer than Rio Grande, with 116 mm of rain.
Among the 448 cities listed in Brazil, Rio Grande ranks 448th of 448 for the warmest August highs and joint 420th of 448 for the driest August (rainfall, lowest first). The mean August high of those 448 cities is 26.2°C; Rio Grande is 10.4°C cooler than that mean.
From August to September, average highs rise by 0.9°C to 16.7°C, and monthly rainfall rises from 108 mm to 125 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rio Grande climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 24.6°C21.9°C | 21.9°C | 87 | 8.6 | 14.014 h |
| February | 24.9°C22.3°C | 22.3°C | 85 | 9.8 | 13.213 h |
| March | 24.0°C21.4°C | 21.4°C | 92 | 9.9 | 12.312 h |
| April | 21.7°C18.8°C | 18.8°C | 112 | 10.1 | 11.311 h |
| May | 18.6°C15.8°C | 15.8°C | 104 | 9.8 | 10.511 h |
| June | 16.1°C13.0°C | 13.0°C | 110 | 9.7 | 10.110 h |
| July | 15.0°C11.7°C | 11.7°C | 112 | 10.1 | 10.310 h |
| August, selected | 15.8°C12.5°C | 12.5°C | 108 | 9.6 | 11.011 h |
| September | 16.7°C13.7°C | 13.7°C | 125 | 10.2 | 11.912 h |
| October | 18.9°C16.1°C | 16.1°C | 129 | 10.1 | 12.913 h |
| November | 21.0°C18.0°C | 18.0°C | 87 | 7.7 | 13.714 h |
| December | 23.2°C20.2°C | 20.2°C | 86 | 8.0 | 14.214 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Pelotas in AugustBrazil · 37 kmHigh 17.6°C · Low 11.1°C · 116 mm rain
- Bagé in AugustBrazil · 206 kmHigh 18.5°C · Low 9.3°C · 113 mm rain
- Guaíba in AugustBrazil · 226 kmHigh 20.4°C · Low 11.0°C · 120 mm rain
- Cachoeira do Sul in AugustBrazil · 235 kmHigh 20.2°C · Low 10.3°C · 121 mm rain
- Porto Alegre in AugustBrazil · 238 kmHigh 20.6°C · Low 11.0°C · 120 mm rain
- Viamão in AugustBrazil · 240 kmHigh 19.9°C · Low 11.2°C · 122 mm rain
- Alvorada in AugustBrazil · 246 kmHigh 20.5°C · Low 11.1°C · 122 mm rain
- Canoas in AugustBrazil · 251 kmHigh 20.7°C · Low 11.0°C · 120 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rio Grande) is explained once on the Rio Grande year overview and on the Sources, method and limits page.