Climate Overview
The climate in Santo Tomás is hot. The average annual temperature is 25°C and approximately 1641mm of precipitation falls per year. October is the wettest month, receiving around 328mm of rainfall. Santo Tomás is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, September. The coldest months are January, February, March, when temperatures can drop to 21°C.
Temperature
Santo Tomás sees moderate temperature variation throughout the year, ranging from 21°C to 32°C. The warmest month is April, when average highs reach 32°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 21°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
Santo Tomás is a fairly wet location, receiving approximately 1641mm of precipitation annually, which averages out to around 137mm per month. The wettest month is October, averaging 328mm of rainfall. May and June also tend to see above-average precipitation. The driest month is March, with just 28mm. That's 301mm less than October, 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
Santo Tomás 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 February, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, 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 3km/h gap between the calmest and windiest months.
Seasons
92 days until Autumn
It is currently summer in Santo Tomás, which began on June 21, 2026. Santo Tomás is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in April at around 32°C, while the coldest stretch bottoms out in January near 21°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.
Spring
Temperatures range from 22 to 32°C. Rainfall is heavy, totalling around 328mm across the season with a monthly average of 109mm. Winds are generally light, averaging 4km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 30°C. Rainfall is heavy, totalling around 511mm across the season with a monthly average of 170mm. Winds are generally light, averaging 4km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 22 to 30°C. Rainfall is heavy, totalling around 670mm across the season with a monthly average of 223mm. Winds are generally light, averaging 3km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 21 to 29°C. Rainfall is relatively light, with around 132mm over the season and a monthly average of 44mm. Winds are generally light, averaging 5km/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 Santo Tomás is during January, February and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 44mm per month. By contrast, April can be uncomfortably hot with temperatures reaching 32°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Santo Tomás 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.
