Climate Overview
The climate in San José is hot. The average annual temperature is 25°C and approximately 2838mm of precipitation falls per year. San José receives a notable amount of rainfall throughout the year, including during its driest month. San José is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, March. The coldest months are January, February, December, when temperatures can drop to 23°C.
Temperature
San José has relatively stable temperatures year-round, staying within a 6°C range. The warmest month is April, when average highs reach 29°C and the mean temperature sits around 26°C. January is the coolest month, with minimum temperatures around 23°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows.
Precipitation
San José is a very wet location, receiving approximately 2838mm of precipitation annually, which averages out to around 237mm per month. The wettest month is October, averaging 402mm of rainfall. June and November also tend to see above-average precipitation. The driest month is April, with just 69mm. That's 333mm 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
San José is relatively calm, with an average annual wind speed of 5km/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 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 4km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.
Seasons
91 days until Autumn
It is currently summer in San José, which began on June 21, 2026. San José 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 29°C, while the coldest stretch bottoms out in January near 23°C. Autumn is next, beginning on September 23, 2026 — 91 days from now.
Spring
Temperatures range from 23 to 29°C. Rainfall is heavy, totalling around 455mm across the season with a monthly average of 152mm. Winds are generally light, averaging 5km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 24 to 28°C. Rainfall is heavy, totalling around 923mm across the season with a monthly average of 308mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 28°C. Rainfall is heavy, totalling around 971mm across the season with a monthly average of 324mm. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 23 to 27°C. Rainfall is heavy, totalling around 490mm across the season with a monthly average of 163mm. Winds are generally light, averaging 7km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for San José 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.
