Climate Insights for San José

The climate in San José is warm and mild. The average annual temperature is 25°C and approximately 2831mm 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 February, January, December, when temperatures can drop to 22°C.

San José has relatively stable temperatures year-round, staying within a 6°C range. The warmest month is April, when average highs reach 28°C and the mean temperature sits around 26°C. February is the coolest month, with minimum temperatures around 22°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.

San José is a very wet location, receiving approximately 2831mm of precipitation annually, which averages out to around 236mm per month. The wettest month is November, averaging 374mm of rainfall. October and June also tend to see above-average precipitation. The driest month is March, with just 74mm. That's 300mm less than November, 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.

San José is mildly breezy, with an average annual wind speed of 15km/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 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in October, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 11km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 19km/h in winter, 15km/h in spring, 13km/h in summer, 11km/h in autumn.

It is currently autumn in San José, which began on September 23, 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 28°C, while the coldest stretch bottoms out in February near 22°C. Winter is next, beginning on December 21, 2026 (88 days from now).

The best time to visit San José is during February and March, when the weather is most comfortable for travellers. During these months, average temperatures hover around 25°C with modest rainfall averaging 87mm per month. By contrast, April can be uncomfortably hot with temperatures reaching 28°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

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.