Climate Overview
The climate in San José is hot. The average annual temperature is 26°C and approximately 4625mm of precipitation falls per year. San José receives a notable amount of rainfall throughout the year, including during its driest month. San José sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
San José has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is March, when average highs reach 30°C and the mean temperature sits around 26°C. September is the coolest month, with minimum temperatures around 22°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows.
Precipitation
San José is a very wet location, receiving approximately 4625mm of precipitation annually, which averages out to around 385mm per month. The wettest month is January, averaging 549mm of rainfall. May and April also tend to see above-average precipitation. The driest month is August, with just 276mm. That's 273mm less than January, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.
Wind
San José 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 September, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 1km/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.
Seasons
83 days until Autumn
It is currently summer in San José, which began on June 21, 2026. San José sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in March at around 30°C, while the coldest stretch bottoms out in September near 22°C. Autumn is next, beginning on September 23, 2026 — 83 days from now.
Spring
Temperatures range from 23 to 30°C. Rainfall is heavy, totalling around 1351mm across the season with a monthly average of 450mm. Winds are generally light, averaging 1km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 29°C. Rainfall is heavy, totalling around 971mm across the season with a monthly average of 324mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 22 to 29°C. Rainfall is heavy, totalling around 927mm across the season with a monthly average of 309mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 23 to 30°C. Rainfall is heavy, totalling around 1376mm across the season with a monthly average of 459mm. Winds are generally light, averaging 2km/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.
