Climate Insights for Barreiras

The climate in Barreiras is hot. The average annual temperature is 25°C and approximately 946mm of precipitation falls per year. January is the wettest month, receiving around 188mm of rainfall. Barreiras 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: October, September, August. The coldest months are July, June, August, when temperatures can drop to 17°C.

Barreiras sees moderate temperature variation throughout the year, ranging from 17°C to 35°C. The warmest month is October, when average highs reach 35°C and the mean temperature sits around 28°C. July is the coolest month, with minimum temperatures around 17°C and an average of 23°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 2°C shift in average temperatures.

Barreiras is a moderately rainy area, receiving approximately 946mm of precipitation annually, which averages out to around 79mm per month. The wettest month is January, averaging 188mm of rainfall. December and November also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 188mm less than January, 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.

Barreiras is relatively calm, with an average annual wind speed of 12km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/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 14km/h in winter, 13km/h in spring, 10km/h in summer, 11km/h in autumn.

It is currently autumn in Barreiras, which began on March 20, 2026. Barreiras 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 October at around 35°C, while the coldest stretch bottoms out in July near 17°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Barreiras is during April, May, June and July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 23mm per month. By contrast, October can be uncomfortably hot with temperatures reaching 35°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Barreiras 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.