Climate Insights for Río Grande

The climate in Río Grande is hot. The average annual temperature is 26°C and approximately 795mm of precipitation falls per year. Río Grande receives a notable amount of rainfall throughout the year, including during its driest month. Río Grande is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, August, June. The coldest months are January, February, March, when temperatures can drop to 21°C.

Río Grande has relatively stable temperatures year-round, staying within a 10°C range. The warmest month is September, when average highs reach 31°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 21°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows.

Río Grande is a relatively dry area, receiving approximately 795mm of precipitation annually, which averages out to around 66mm per month. The wettest month is November, averaging 97mm of rainfall. September and October also tend to see above-average precipitation. The driest month is June, with just 34mm. That's 64mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Río Grande is mildly breezy, with an average annual wind speed of 14km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months.

It is currently summer in Río Grande, which began on June 21, 2026. Río Grande is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 31°C, while the coldest stretch bottoms out in January near 21°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Río Grande is during January, February, March and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 63mm per month. By contrast, September can be uncomfortably hot with temperatures reaching 31°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Río Grande based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.