Average annual temperature is 26.1 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: 21.6 °C
Number of sunny days: 23 days
Number of rainy days: 342 days
Look at detailed online map of San Marcos
* Weather data for San Marcos 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) | 29.0 | 29.9 | 30.1 | 30.3 | 30.4 | 35.5 | 29.8 | 29.9 | 29.8 | 29.9 | 29.4 | 30.2 |
| Average daytime temperature (°C) | 27.3 | 28.7 | 28.6 | 29.0 | 29.3 | 29.0 | 28.4 | 28.4 | 28.4 | 28.3 | 27.8 | 28.8 |
| Average temperature (°C) | 25.2 | 26.4 | 26.1 | 26.5 | 26.9 | 26.5 | 26.2 | 26.1 | 26.0 | 25.6 | 25.5 | 26.3 |
| Average night temperature (°C) | 22.9 | 23.7 | 23.5 | 24.2 | 24.8 | 24.6 | 24.3 | 24.2 | 24.1 | 23.7 | 23.9 | 24.0 |
| Absolute minimum temperature (°C) | 21.6 | 22.7 | 22.7 | 23.5 | 23.4 | 23.8 | 23.1 | 22.7 | 23.0 | 22.7 | 22.5 | 22.0 |
| 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) | 11.7 | 11.8 | 12.1 | 12.3 | 12.5 | 12.6 | 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) | 10.1 | 10.9 | 10.1 | 10.5 | 9.4 | 8.2 | 7.0 | 7.7 | 8.1 | 7.2 | 6.8 | 10.4 |
| Precipitation (mm) | 100 | 28 | 126 | 74 | 240 | 237 | 344 | 349 | 279 | 544 | 710 | 141 |
| Sunny days | 0 | 5 | 5 | 5 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 5 |
| Rainy days | 31 | 23 | 26 | 25 | 29 | 29 | 31 | 31 | 30 | 31 | 30 | 26 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in San Marcos is at