Climate Insights for Rosário do Sul

The climate in Rosário do Sul is warm and mild. The average annual temperature is 20°C and approximately 1499mm of precipitation falls per year. Rosário do Sul receives a notable amount of rainfall throughout the year, including during its driest month. Rosário do Sul 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: December, January, February. The coldest months are July, June, August, when temperatures can drop to 9°C.

Temperatures in Rosário do Sul vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is December, when average highs reach 31°C and the mean temperature sits around 25°C. July is the coolest month, with minimum temperatures around 9°C and an average of 13°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 4°C shift in average temperatures.

Rosário do Sul is a fairly wet location, receiving approximately 1499mm of precipitation annually, which averages out to around 125mm per month. The wettest month is October, averaging 177mm of rainfall. January and May also tend to see above-average precipitation. The driest month is February, with just 88mm. That's 88mm less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Rosário do Sul is relatively calm, with an average annual wind speed of 4km/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 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently winter in Rosário do Sul, which began on June 21, 2026. Rosário do Sul 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 December at around 31°C, while the coldest stretch bottoms out in July near 9°C. Spring is next, beginning on September 23, 2026 — 90 days from now.

The best time to visit Rosário do Sul is during February, when the weather is most comfortable for travellers. During these months, average temperatures hover around 25°C with modest rainfall averaging 88mm per month. By contrast, December can be uncomfortably hot with highs reaching 31°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 Rosário do Sul 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.