San Isidro, Costa Rica Climate by Month
San Isidro, San José, Costa Rica
Warm all year, with rain spread through the year.
San Isidro is warm all year, with rain spread through the year. Afternoon highs range from 82°F (28°C) in November to 87°F (31°C) in March, and January nights average 61°F (16°C). It gets 114 in (2894 mm) of rain a year, spread across the months. The air is humid, averaging 85% relative humidity.
- Warmest month
- 87°F(31°C)
- Average high, March
- Coldest nights
- 61°F(16°C)
- Average low, January
- Rain per year
- 114 in(2894 mm)
- No clear rainy season
- Humidity
- 85%
- Sunniest: March
Best and worst months in San Isidro
Best for weatherJanuary and February are the best time for weather in San Isidro: highs near 85°F (30°C) and about 2.1 in (55 mm) of rain a month.
Least pleasantOctober is the least pleasant month: it's the wettest, with 19 in (477 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 February.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Isidro weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuaryBest | 84°F(29°C) | 61°F(16°C) | 2.7 in(69 mm) | 83% | 5.3 |
| FebFebruaryBest | 86°F(30°C) | 61°F(16°C) | 1.6 in(40 mm) | 81% | 5.7 |
| MarMarch | 87°F(31°C) | 62°F(17°C) | 2.8 in(72 mm) | 81% | 5.9 |
| AprApril | 87°F(31°C) | 64°F(18°C) | 6.2 in(157 mm) | 83% | 5.7 |
| MayMay | 86°F(30°C) | 64°F(18°C) | 14 in(354 mm) | 87% | 5.4 |
| JunJune | 85°F(30°C) | 64°F(18°C) | 12 in(302 mm) | 86% | 5.3 |
| JulJuly | 85°F(29°C) | 64°F(18°C) | 11 in(270 mm) | 86% | 5.2 |
| AugAugust | 85°F(29°C) | 64°F(18°C) | 14 in(358 mm) | 86% | 5.3 |
| SepSeptember | 84°F(29°C) | 63°F(17°C) | 15 in(376 mm) | 88% | 5.3 |
| OctOctober | 83°F(28°C) | 64°F(18°C) | 19 in(477 mm) | 86% | 5.0 |
| NovNovember | 82°F(28°C) | 63°F(17°C) | 13 in(324 mm) | 87% | 4.7 |
| DecDecember | 83°F(29°C) | 62°F(17°C) | 3.7 in(95 mm) | 88% | 4.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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