Climate averages 1991–2020
San José weather
in August.
A warm, very wet month: the 7th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in San José: daytime highs average 24.3°C and nights cool to about 18.2°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 345 mm of rain on roughly 29 days, which makes August a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average August day.
The nearest other city in this atlas is David (247 km away). In August its highs average 28.1°C, 3.8°C warmer than San José, with 453 mm of rain.
From August to September, average highs fall by 0.1°C to 24.2°C, and monthly rainfall rises from 345 mm to 391 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San José climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 24.6°C16.8°C | 16.8°C | 104 | 13.3 | 11.612 h |
| February | 25.7°C16.9°C | 16.9°C | 69 | 11.9 | 11.812 h |
| March | 26.6°C17.4°C | 17.4°C | 65 | 13.9 | 12.112 h |
| April | 26.5°C18.1°C | 18.1°C | 102 | 18.0 | 12.312 h |
| May | 25.0°C18.6°C | 18.6°C | 357 | 27.8 | 12.613 h |
| June | 24.4°C18.6°C | 18.6°C | 385 | 28.8 | 12.713 h |
| July | 24.2°C18.3°C | 18.3°C | 293 | 28.2 | 12.613 h |
| August, selected | 24.3°C18.2°C | 18.2°C | 345 | 28.5 | 12.412 h |
| September | 24.2°C18.1°C | 18.1°C | 391 | 29.1 | 12.212 h |
| October | 23.7°C18.1°C | 18.1°C | 430 | 30.1 | 11.912 h |
| November | 23.4°C17.9°C | 17.9°C | 312 | 25.5 | 11.712 h |
| December | 23.8°C17.3°C | 17.3°C | 169 | 17.8 | 11.612 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- David in AugustPanama · 247 kmHigh 28.1°C · Low 22.0°C · 453 mm rain
- Granada, Nicaragua in AugustNicaragua · 302 kmHigh 29.6°C · Low 24.7°C · 140 mm rain
- Masaya in AugustNicaragua · 316 kmHigh 29.4°C · Low 23.5°C · 140 mm rain
- Managua in AugustNicaragua · 340 kmHigh 31.8°C · Low 24.6°C · 109 mm rain
- Matagalpa in AugustNicaragua · 388 kmHigh 27.6°C · Low 20.8°C · 113 mm rain
- León, Nicaragua in AugustNicaragua · 413 kmHigh 31.4°C · Low 24.8°C · 231 mm rain
- Estelí in AugustNicaragua · 430 kmHigh 28.2°C · Low 20.5°C · 150 mm rain
- Chinandega in AugustNicaragua · 447 kmHigh 31.5°C · Low 25.0°C · 249 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San José) is explained once on the San José year overview and on the Sources, method and limits page.