Average annual temperature is 22.6 °C
Absolute maximum temperature: 28.3 °C
Absolute minimum temperature: 16.4 °C
Number of sunny days: 3 days
Number of rainy days: 362 days
Look at detailed online map of Alto San Juan
* Weather data for Alto San Juan Costa Rica is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 26.4 | 28.3 | 27.3 | 28.1 | 27.9 | 27.2 | 27.6 | 26.9 | 26.3 | 26.1 | 26.8 | 27.1 |
| Average daytime temperature (°C) | 24.6 | 26.6 | 25.6 | 26.0 | 26.1 | 25.3 | 25.3 | 25.2 | 25.1 | 24.7 | 24.6 | 25.9 |
| Average temperature (°C) | 22.1 | 23.3 | 22.6 | 23.0 | 23.5 | 22.8 | 22.6 | 22.4 | 22.3 | 21.9 | 22.0 | 22.6 |
| Average night temperature (°C) | 19.7 | 20.1 | 19.8 | 20.3 | 21.2 | 20.8 | 20.5 | 20.1 | 20.0 | 20.0 | 20.1 | 19.8 |
| Absolute minimum temperature (°C) | 17.6 | 18.2 | 17.5 | 18.5 | 20.1 | 19.8 | 19.5 | 19.2 | 18.8 | 18.9 | 19.3 | 16.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.6 | 11.8 | 12.1 | 12.3 | 12.6 | 12.7 | 12.6 | 12.4 | 12.2 | 11.9 | 11.7 | 11.6 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 10.2 | 10.9 | 9.9 | 10.5 | 9.2 | 7.6 | 7.5 | 7.7 | 8.1 | 6.5 | 7.8 | 10.3 |
| Precipitation (mm) | 244 | 85 | 260 | 277 | 395 | 448 | 782 | 620 | 657 | 862 | 558 | 187 |
| Sunny days | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Rainy days | 31 | 26 | 31 | 30 | 31 | 30 | 31 | 31 | 30 | 31 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Alto San Juan is at