Climate Overview
The climate in Río Grande is hot. The average annual temperature is 27°C and approximately 1656mm of precipitation falls per year. November is the wettest month, receiving around 281mm of rainfall. Río Grande sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Río Grande has relatively stable temperatures year-round, staying within a 5°C range. The warmest month is April, when average highs reach 30°C and the mean temperature sits around 27°C. February is the coolest month, with minimum temperatures around 25°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.
Precipitation
Río Grande is a fairly wet location, receiving approximately 1656mm of precipitation annually, which averages out to around 138mm per month. The wettest month is November, averaging 281mm of rainfall. July and October also tend to see above-average precipitation. The driest month is February, with just 1mm. That's 280mm less than November, 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 mildly breezy, with an average annual wind speed of 17km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 25km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in September, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 12km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 22km/h in winter, 19km/h in spring, 14km/h in summer, 14km/h in autumn.
Seasons
89 days until Summer
It is currently spring in Río Grande, which began on March 20, 2026. Río Grande sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in April at around 30°C, while the coldest stretch bottoms out in February near 25°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 25 to 30°C. Precipitation is moderate at around 210mm for the season, averaging 70mm per month. Winds are moderate at around 19km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 665mm across the season with a monthly average of 222mm. Winds are generally light, averaging 14km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 29°C. Rainfall is heavy, totalling around 729mm across the season with a monthly average of 243mm. Winds are generally light, averaging 14km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 25 to 29°C. Rainfall is relatively light, with around 52mm over the season and a monthly average of 17mm. Winds are moderate at around 22km/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.
