Climate Overview
The climate in São Simão is warm and mild. The average annual temperature is 23°C and approximately 1376mm of precipitation falls per year. January is the wettest month, receiving around 341mm of rainfall. São Simão 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, April, September. The coldest months are June, July, August, when temperatures can drop to 14°C.
Temperature
São Simão sees moderate temperature variation throughout the year, ranging from 14°C to 31°C. The warmest month is October, when average highs reach 31°C and the mean temperature sits around 25°C. June is the coolest month, with minimum temperatures around 14°C and an average of 19°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 4°C shift in average temperatures.
Precipitation
São Simão is a fairly wet location, receiving approximately 1376mm of precipitation annually, which averages out to around 115mm per month. The wettest month is January, averaging 341mm of rainfall. March and December also tend to see above-average precipitation. The driest month is July, with just 2mm. That's 339mm 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.
Wind
São Simão 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 October, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 2km/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.
Seasons
61 days until Spring
It is currently winter in São Simão, which began on June 21, 2026. São Simão 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 31°C, while the coldest stretch bottoms out in June near 14°C. Spring is next, beginning on September 23, 2026 — 61 days from now.
Spring
Temperatures range from 18 to 31°C. Precipitation is moderate at around 294mm for the season, averaging 98mm per month. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 21 to 31°C. Rainfall is heavy, totalling around 661mm across the season with a monthly average of 220mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 16 to 31°C. Precipitation is moderate at around 271mm for the season, averaging 90mm per month. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 14 to 29°C. Rainfall is relatively light, with around 151mm over the season and a monthly average of 50mm. Winds are generally light, averaging 2km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit São Simão is during May, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 25mm per month. By contrast, October can be uncomfortably hot with highs reaching 31°C, while June is the coldest period with lows dropping to 14°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for São Simão 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.