San José, Costa Rica Climate by Month
San José, Alajuela Province, Costa Rica
Hot all year, with rain spread through the year.
The climate in San José is hot all year, with rain spread through the year. April is the warmest month, with highs around 90°F (32°C); November is the coolest at 86°F (30°C), and nights dip to 71°F (22°C). It gets 109 in (2768 mm) of rain a year, spread across the months. The air is humid, averaging 81% relative humidity.
- Warmest month
- 90°F(32°C)
- Average high, April
- Coldest nights
- 71°F(22°C)
- Average low, December
- Rain per year
- 109 in(2768 mm)
- No clear rainy season
- Humidity
- 81%
- Sunniest: April
Best and worst months in San José
Best for weatherThe most comfortable weather comes from February to April, with highs around 89°F (32°C) and about 2.4 in (60 mm) of rain a month.
Least pleasantJune and October are the least pleasant; June is the wettest, with 14 in (351 mm) of rain.
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in March.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San José weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 86°F(30°C) | 71°F(22°C) | 8.5 in(216 mm) | 78% | 4.9 |
| FebFebruaryBest | 87°F(31°C) | 72°F(22°C) | 3.9 in(98 mm) | 76% | 5.5 |
| MarMarchBest | 89°F(32°C) | 73°F(23°C) | 1.8 in(46 mm) | 75% | 5.9 |
| AprAprilBest | 90°F(32°C) | 74°F(23°C) | 1.5 in(37 mm) | 75% | 6.2 |
| MayMay | 89°F(32°C) | 74°F(24°C) | 9.1 in(230 mm) | 79% | 5.7 |
| JunJune | 88°F(31°C) | 74°F(23°C) | 14 in(351 mm) | 84% | 5.4 |
| JulJuly | 88°F(31°C) | 74°F(23°C) | 13 in(322 mm) | 84% | 5.5 |
| AugAugust | 88°F(31°C) | 73°F(23°C) | 12 in(302 mm) | 84% | 5.4 |
| SepSeptember | 88°F(31°C) | 73°F(23°C) | 13 in(322 mm) | 85% | 5.5 |
| OctOctober | 87°F(31°C) | 73°F(23°C) | 14 in(348 mm) | 84% | 5.1 |
| NovNovember | 86°F(30°C) | 72°F(22°C) | 11 in(280 mm) | 83% | 4.7 |
| DecDecember | 86°F(30°C) | 71°F(22°C) | 8.5 in(216 mm) | 82% | 4.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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