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San José, Costa Rica climate
As Tropical savanna (dry summer)
San José has a remarkably steady warm-temperate climate (Tropical savanna (dry summer), Köppen As). The hottest month is April with an average daily high near 87°F, while the coldest is October averaging around 65°F at night. Precipitation totals about 59 inches a year and is strongly seasonal — October alone averages 11.3 inches while March barely receives 0.17 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)San José climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 85 | 86 | 87 | 84 | 83 | 83 | 83 | 83 | 82 | 82 | 83 |
| Avg temp (°F) | 74 | 75 | 76 | 77 | 75 | 75 | 75 | 74 | 74 | 73 | 73 | 74 |
| Avg low (°F) | 65 | 65 | 65 | 66 | 66 | 66 | 66 | 65 | 65 | 65 | 65 | 65 |
| Precipitation (in) | 0.3 | 0.3 | 0.2 | 2.1 | 6.9 | 8.2 | 5.1 | 7.0 | 10.2 | 11.3 | 5.8 | 1.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 85 | 86 | 87 | 84 | 83 |
| Avg temp (°F) | 74 | 75 | 76 | 77 | 75 | 75 |
| Avg low (°F) | 65 | 65 | 65 | 66 | 66 | 66 |
| Precipitation (in) | 0.3 | 0.3 | 0.2 | 2.1 | 6.9 | 8.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 83 | 83 | 82 | 82 | 83 |
| Avg temp (°F) | 75 | 74 | 74 | 73 | 73 | 74 |
| Avg low (°F) | 66 | 65 | 65 | 65 | 65 | 65 |
| Precipitation (in) | 5.1 | 7.0 | 10.2 | 11.3 | 5.8 | 1.4 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 43 | 38 | 41 | 67 | 82 | 85 | 85 | 84 | 84 | 84 | 78 | 57 |
| Relative humidity (%) | 76 | 69 | 63 | 67 | 80 | 87 | 86 | 87 | 89 | 91 | 89 | 83 |
| Wind speed (mph) | 1.5 | 1.7 | 1.7 | 1.5 | 1.3 | 1.2 | 1.1 | 1.1 | 1.3 | 1.3 | 1.2 | 1.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 43 | 38 | 41 | 67 | 82 | 85 |
| Relative humidity (%) | 76 | 69 | 63 | 67 | 80 | 87 |
| Wind speed (mph) | 1.5 | 1.7 | 1.7 | 1.5 | 1.3 | 1.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 85 | 84 | 84 | 84 | 78 | 57 |
| Relative humidity (%) | 86 | 87 | 89 | 91 | 89 | 83 |
| Wind speed (mph) | 1.1 | 1.1 | 1.3 | 1.3 | 1.2 | 1.2 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Juan Santamaria Intl, a weather station, about 15 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.