Average annual temperature is 19.5 °C
Absolute maximum temperature: 27.0 °C
Absolute minimum temperature: 14.3 °C
Number of sunny days: 30 days
Number of rainy days: 335 days
Look at detailed online map of San Martín Sur
* Weather data for San Martín Sur 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) | 22.5 | 21.5 | 24.6 | 27.0 | 26.9 | 25.7 | 26.3 | 25.9 | 25.6 | 25.2 | 24.6 | 24.1 |
| Average daytime temperature (°C) | 20.5 | 20.2 | 22.2 | 23.5 | 25.1 | 24.1 | 23.7 | 24.0 | 24.4 | 23.4 | 22.8 | 21.1 |
| Average temperature (°C) | 17.8 | 17.5 | 18.6 | 19.4 | 20.8 | 20.6 | 20.3 | 20.3 | 20.4 | 20.2 | 19.8 | 18.7 |
| Average night temperature (°C) | 16.0 | 15.9 | 16.0 | 16.2 | 17.8 | 18.2 | 18.1 | 18.2 | 17.8 | 18.0 | 17.9 | 16.9 |
| Absolute minimum temperature (°C) | 14.7 | 14.3 | 15.0 | 14.3 | 16.2 | 16.7 | 16.4 | 16.4 | 16.6 | 16.7 | 16.9 | 14.6 |
| 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 | 12.4 | 12.6 | 12.7 | 12.7 | 12.5 | 12.2 | 11.9 | 11.7 | 11.5 |
| 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) | 8.3 | 8.9 | 9.3 | 10.1 | 9.2 | 7.8 | 7.2 | 7.0 | 8.7 | 6.4 | 6.2 | 6.4 |
| Precipitation (mm) | 96 | 92 | 77 | 36 | 111 | 207 | 127 | 275 | 166 | 632 | 172 | 111 |
| Sunny days | 3 | 1 | 4 | 12 | 4 | 0 | 0 | 1 | 1 | 0 | 0 | 4 |
| Rainy days | 28 | 27 | 27 | 18 | 27 | 30 | 31 | 30 | 29 | 31 | 30 | 27 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit San Martín Sur during the most sunny months:
The largest precipitation sum in San Martín Sur is at