Climate Insights for Arroio Grande

The climate in Arroio Grande is warm and mild. The average annual temperature is 19°C and approximately 1271mm of precipitation falls per year. Arroio Grande receives a notable amount of rainfall throughout the year, including during its driest month. Arroio Grande 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: February, January, December. The coldest months are July, August, June, when temperatures can drop to 10°C.

Arroio Grande sees moderate temperature variation throughout the year, ranging from 10°C to 28°C. The warmest month is February, when average highs reach 28°C and the mean temperature sits around 24°C. July is the coolest month, with minimum temperatures around 10°C and an average of 13°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between April and May, with a 4°C shift in average temperatures.

Arroio Grande is a fairly wet location, receiving approximately 1271mm of precipitation annually, which averages out to around 106mm per month. The wettest month is January, averaging 151mm of rainfall. October and April also tend to see above-average precipitation. The driest month is February, with just 56mm. That's 95mm less than January, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Arroio Grande 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 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 4km/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 Arroio Grande, which began on June 21, 2026. Arroio Grande 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 February at around 28°C, while the coldest stretch bottoms out in July near 10°C. Spring is next, beginning on September 23, 2026 — 89 days from now.

The best time to visit Arroio Grande is during February, March, May, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 78mm per month. By contrast, July can be quite cold with temperatures dropping to 10°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 Arroio Grande 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.