Climate Insights for Río Branco

The climate in Río Branco is warm and mild. The average annual temperature is 18°C and approximately 1264mm of precipitation falls per year. Río Branco receives a notable amount of rainfall throughout the year, including during its driest month. Río Branco is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: January, February, December. The coldest months are July, June, August, when temperatures can drop to 9°C.

Río Branco sees moderate temperature variation throughout the year, ranging from 9°C to 29°C. The warmest month is January, when average highs reach 29°C and the mean temperature sits around 24°C. July is the coolest month, with minimum temperatures around 9°C and an average of 13°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between April and May, with a 4°C shift in average temperatures.

Río Branco is a fairly wet location, receiving approximately 1264mm of precipitation annually, which averages out to around 105mm per month. The wettest month is September, averaging 154mm of rainfall. January and August also tend to see above-average precipitation. The driest month is February, with just 76mm. That's 78mm less than September, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Río Branco is moderately windy, with an average annual wind speed of 21km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in May, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months.

It is currently autumn in Río Branco, which began on March 20, 2026. Río Branco is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in January at around 29°C, while the coldest stretch bottoms out in July near 9°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Río Branco is during February, March, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 85mm per month. By contrast, January can be uncomfortably hot with highs reaching 29°C, while July is the coldest period with lows dropping to 9°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Río Branco 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.