Average annual temperature is 19.9 °C
Absolute maximum temperature: 30.4 °C
Absolute minimum temperature: 12.9 °C
Number of sunny days: 71 days
Number of rainy days: 294 days
Look at detailed online map of San Juan Sur
* Weather data for San Juan 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) | 26.5 | 28.3 | 29.1 | 29.0 | 30.4 | 27.0 | 26.4 | 26.4 | 26.7 | 25.1 | 26.8 | 26.8 |
| Average daytime temperature (°C) | 24.4 | 24.8 | 25.4 | 26.9 | 26.8 | 24.6 | 24.7 | 24.6 | 24.9 | 23.2 | 23.7 | 24.8 |
| Average temperature (°C) | 19.3 | 19.8 | 19.8 | 20.5 | 20.9 | 20.2 | 20.2 | 20.0 | 19.7 | 19.2 | 19.4 | 19.7 |
| Average night temperature (°C) | 15.8 | 16.6 | 16.0 | 16.0 | 17.1 | 17.3 | 17.1 | 16.8 | 16.1 | 16.9 | 16.6 | 16.3 |
| Absolute minimum temperature (°C) | 12.9 | 14.3 | 13.4 | 13.0 | 15.6 | 15.9 | 15.3 | 15.4 | 14.3 | 15.8 | 15.0 | 13.4 |
| 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 | 12.4 | 12.6 | 12.7 | 12.6 | 12.4 | 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) | 10.1 | 10.7 | 9.7 | 10.8 | 9.7 | 8.1 | 8.7 | 8.9 | 9.1 | 6.3 | 8.0 | 10.1 |
| Precipitation (mm) | 14 | 3 | 146 | 58 | 314 | 294 | 315 | 334 | 318 | 676 | 378 | 43 |
| Sunny days | 11 | 21 | 8 | 4 | 8 | 1 | 2 | 3 | 0 | 0 | 1 | 12 |
| Rainy days | 20 | 7 | 23 | 26 | 23 | 29 | 29 | 28 | 30 | 31 | 29 | 19 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in San Juan Sur is at