Climate Insights for Barreiras

The climate in Barreiras is hot. The average annual temperature is 27°C and approximately 817mm of precipitation falls per year. January is the wettest month, receiving around 530mm 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, April. The coldest months are July, June, August, when temperatures can drop to 19°C.

Barreiras sees moderate temperature variation throughout the year, ranging from 19°C to 35°C. The warmest month is October, when average highs reach 35°C and the mean temperature sits around 29°C. July is the coolest month, with minimum temperatures around 19°C and an average of 25°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between January and February, with a 2°C shift in average temperatures.

Barreiras is a moderately rainy area, receiving approximately 817mm of precipitation annually, which averages out to around 68mm per month. The wettest month is January, averaging 530mm of rainfall. November and December also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 530mm 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 2km/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 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently winter in Barreiras, which began on June 21, 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 19°C. Spring is next, beginning on September 23, 2026 — 61 days from now.

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.