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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 31°C, while the coldest is October averaging around 18°C at night. Precipitation totals about 1489 mm a year and is strongly seasonal — October alone averages 286 mm while March barely receives 4 mm.
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 (°C) | 28 | 29 | 30 | 31 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 |
| Avg temp (°C) | 23 | 24 | 24 | 25 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 |
| Avg low (°C) | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 |
| Precipitation (mm) | 7 | 7 | 4 | 53 | 176 | 209 | 130 | 177 | 258 | 286 | 146 | 35 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 29 | 30 | 31 | 29 | 29 |
| Avg temp (°C) | 23 | 24 | 24 | 25 | 24 | 24 |
| Avg low (°C) | 18 | 18 | 19 | 19 | 19 | 19 |
| Precipitation (mm) | 7 | 7 | 4 | 53 | 176 | 209 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 28 | 28 | 28 | 28 |
| Avg temp (°C) | 24 | 24 | 23 | 23 | 23 | 23 |
| Avg low (°C) | 19 | 19 | 18 | 18 | 18 | 18 |
| Precipitation (mm) | 130 | 177 | 258 | 286 | 146 | 35 |
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 (km/h) | 2.3 | 2.7 | 2.8 | 2.4 | 2.2 | 1.9 | 1.7 | 1.8 | 2.0 | 2.1 | 1.9 | 2.0 |
| 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 (km/h) | 2.3 | 2.7 | 2.8 | 2.4 | 2.2 | 1.9 |
| 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 (km/h) | 1.7 | 1.8 | 2.0 | 2.1 | 1.9 | 2.0 |
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.