Average annual temperature is 22.5 °C
Absolute maximum temperature: 31.9 °C
Absolute minimum temperature: 13.4 °C
Number of sunny days: 9 days
Number of rainy days: 356 days
Look at detailed online map of San Martín
* Weather data for San Martín 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) | 29.8 | 31.9 | 31.1 | 31.5 | 31.0 | 28.6 | 30.3 | 28.7 | 28.5 | 28.1 | 29.6 | 30.2 |
| Average daytime temperature (°C) | 27.0 | 30.3 | 28.4 | 28.7 | 28.6 | 26.7 | 27.0 | 26.7 | 26.9 | 26.4 | 26.3 | 28.1 |
| Average temperature (°C) | 21.3 | 22.6 | 22.2 | 22.8 | 23.3 | 22.8 | 22.8 | 22.6 | 22.6 | 22.2 | 22.1 | 22.6 |
| Average night temperature (°C) | 17.1 | 16.9 | 18.1 | 18.4 | 20.0 | 20.3 | 20.0 | 19.8 | 19.9 | 19.8 | 19.6 | 18.8 |
| Absolute minimum temperature (°C) | 13.4 | 15.4 | 15.4 | 16.1 | 17.4 | 19.1 | 17.5 | 18.0 | 18.2 | 18.7 | 17.2 | 15.5 |
| 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) | 10.3 | 11.1 | 10.0 | 10.9 | 9.4 | 7.0 | 7.6 | 7.6 | 7.7 | 6.6 | 7.4 | 10.3 |
| Precipitation (mm) | 165 | 44 | 190 | 142 | 297 | 367 | 401 | 394 | 331 | 776 | 391 | 126 |
| Sunny days | 1 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| Rainy days | 30 | 24 | 30 | 30 | 31 | 30 | 31 | 31 | 30 | 31 | 29 | 29 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit San Martín during the most sunny months:
The largest precipitation sum in San Martín is at