Climate Insights for São João da Barra

The climate in São João da Barra is warm and mild. The average annual temperature is 24°C and approximately 826mm of precipitation falls per year. November is the wettest month, receiving around 138mm of rainfall. São João da Barra 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: March, February, January. The coldest months are July, August, June, when temperatures can drop to 20°C.

São João da Barra has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is March, when average highs reach 28°C and the mean temperature sits around 26°C. July is the coolest month, with minimum temperatures around 20°C and an average of 22°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.

São João da Barra is a moderately rainy area, receiving approximately 826mm of precipitation annually, which averages out to around 69mm per month. The wettest month is November, averaging 138mm of rainfall. December and January also tend to see above-average precipitation. The driest month is July, with just 21mm. That's 117mm 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.

São João da Barra is moderately windy, with an average annual wind speed of 25km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 30km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in April, with average winds dropping to 22km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 8km/h between the calmest and windiest months.

It is currently autumn in São João da Barra, which began on March 20, 2026. São João da Barra 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 March at around 28°C, while the coldest stretch bottoms out in July near 20°C. Winter is next, beginning on June 21, 2026 — 87 days from now.

The best time to visit São João da Barra is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 41mm per month. By contrast, March can be uncomfortably hot with temperatures reaching 28°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for São João da Barra 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.