Climate Overview
The climate in Río Grande is hot. The average annual temperature is 27°C and approximately 1581mm of precipitation falls per year. September is the wettest month, receiving around 427mm of rainfall. Río Grande is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, April, March. The coldest months are January, December, February, when temperatures can drop to 23°C.
Temperature
Río Grande has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is May, when average highs reach 31°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 23°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows.
Precipitation
Río Grande is a fairly wet location, receiving approximately 1581mm of precipitation annually, which averages out to around 132mm per month. The wettest month is September, averaging 427mm of rainfall. August and June also tend to see above-average precipitation. The driest month is April, with just 3mm. That's 424mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Río Grande is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Río Grande, which began on September 23, 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 May at around 31°C, while the coldest stretch bottoms out in January near 23°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 23 to 31°C. Rainfall is relatively light, with around 70mm over the season and a monthly average of 23mm. Winds are generally light, averaging 9km/h. Light layers work well as temperatures warm through the season. It is a great time to be outdoors.
Summer
Temperatures range from 25 to 30°C. Rainfall is heavy, totalling around 785mm across the season with a monthly average of 262mm. Winds are generally light, averaging 7km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 29°C. Rainfall is heavy, totalling around 714mm across the season with a monthly average of 238mm. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 23 to 29°C. Precipitation is minimal, with only around 13mm for the entire season. Winds are generally light, averaging 8km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
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.
