Climate Insights for São Mateus

The climate in São Mateus is warm and mild. The average annual temperature is 25°C and approximately 1197mm of precipitation falls per year. São Mateus receives a notable amount of rainfall throughout the year, including during its driest month. São Mateus 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 21°C.

São Mateus has relatively stable temperatures year-round, staying within a 7°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 21°C and an average of 23°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.

São Mateus is a moderately rainy area, receiving approximately 1197mm of precipitation annually, which averages out to around 100mm per month. The wettest month is December, averaging 196mm of rainfall. November and January also tend to see above-average precipitation. The driest month is June, with just 48mm. That's 148mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

São Mateus is mildly breezy, with an average annual wind speed of 17km/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 20km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 14km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months.

It is currently winter in São Mateus, which began on June 21, 2026. São Mateus 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 21°C. Spring is next, beginning on September 23, 2026 (3 days from now).

The best time to visit São Mateus is during May, June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 55mm 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 Mateus 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.