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Rio Grande Weather by Month
Average temperatures, rainfall and humidity for Rio Grande, Brazil, month by month, built from OpenWeather’s historical records. Use it to see what a typical Rio Grande month looks like before you travel — then check the live Rio Grande forecast for the days ahead.
Warmest month
February
29°C average high
Coolest month
July
10°C average low
Wettest month
September
119 mm of rain
Driest month
December
53 mm of rain
Average temperature and rainfall in Rio Grande by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 29°C | 21°C | 11°C / 41°C | 65 mm | 76% | 18 km/h |
| February | 29°C | 20°C | 10°C / 40°C | 53 mm | 77% | 17 km/h |
| March | 27°C | 19°C | 6°C / 38°C | 58 mm | 78% | 17 km/h |
| April | 25°C | 17°C | 6°C / 36°C | 54 mm | 78% | 17 km/h |
| May | 20°C | 13°C | 1°C / 33°C | 73 mm | 82% | 16 km/h |
| June | 18°C | 11°C | 0°C / 31°C | 83 mm | 84% | 15 km/h |
| July | 17°C | 10°C | -2°C / 31°C | 69 mm | 86% | 15 km/h |
| August | 19°C | 11°C | -1°C / 34°C | 80 mm | 84% | 17 km/h |
| September | 20°C | 13°C | 1°C / 35°C | 119 mm | 84% | 18 km/h |
| October | 22°C | 15°C | 4°C / 37°C | 63 mm | 81% | 19 km/h |
| November | 25°C | 17°C | 4°C / 38°C | 54 mm | 76% | 19 km/h |
| December | 27°C | 19°C | 10°C / 38°C | 53 mm | 75% | 19 km/h |
Best time to visit Rio Grande
The most comfortable time to visit Rio Grande is generally April and October to November, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around September, totalling about 823 mm a year.
Travellers who prefer heat should aim for February, when highs average 29°C. September is the month to avoid if rain would spoil your plans — it averages 119 mm, roughly 2× the rainfall of the driest month (December).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Rio Grande forecast for what is happening now.
Weather across Brazil right now
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