Average annual temperature is 25.6 °C
Absolute maximum temperature: 33.2 °C
Absolute minimum temperature: 17.6 °C
Number of sunny days: 18 days
Number of rainy days: 347 days
Look at detailed online map of San Juan
* Weather data for 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) | 30.2 | 32.9 | 32.5 | 32.2 | 33.2 | 30.7 | 30.7 | 30.4 | 30.6 | 30.4 | 29.8 | 30.3 |
| Average daytime temperature (°C) | 28.6 | 31.1 | 30.4 | 30.7 | 30.8 | 29.2 | 28.9 | 28.9 | 29.2 | 29.0 | 28.3 | 29.3 |
| Average temperature (°C) | 24.5 | 26.1 | 25.6 | 26.2 | 26.5 | 25.8 | 25.6 | 25.5 | 25.6 | 25.2 | 25.1 | 25.6 |
| Average night temperature (°C) | 21.0 | 21.5 | 21.9 | 22.6 | 23.7 | 23.4 | 23.3 | 23.2 | 23.3 | 22.9 | 22.9 | 22.5 |
| Absolute minimum temperature (°C) | 17.6 | 20.2 | 18.0 | 20.2 | 21.2 | 22.2 | 22.1 | 21.5 | 22.6 | 22.0 | 20.9 | 19.6 |
| 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 | 11.0 | 9.9 | 10.6 | 9.1 | 7.4 | 7.6 | 7.6 | 8.1 | 6.8 | 7.8 | 10.2 |
| Precipitation (mm) | 92 | 7 | 177 | 127 | 306 | 407 | 607 | 491 | 516 | 713 | 379 | 103 |
| Sunny days | 1 | 8 | 2 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| Rainy days | 30 | 20 | 29 | 27 | 30 | 30 | 31 | 31 | 30 | 31 | 30 | 28 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in San Juan is at