Average annual temperature is 4.2 °C
Absolute maximum temperature: 13.4 °C
Absolute minimum temperature: -3.7 °C
Number of sunny days: 77 days
Number of rainy days: 279 days
Number of snow days: 9 days
Look at detailed online map of San Marcos
* Weather data for San Marcos Peru is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 12.0 | 11.2 | 10.8 | 10.9 | 10.3 | 10.5 | 12.3 | 13.4 | 12.2 | 12.8 | 13.1 | 12.5 |
| Average daytime temperature (°C) | 8.8 | 8.1 | 8.7 | 9.0 | 8.3 | 8.9 | 10.3 | 10.1 | 10.1 | 10.9 | 11.2 | 10.6 |
| Average temperature (°C) | 3.3 | 3.5 | 3.7 | 3.9 | 3.5 | 4.1 | 4.9 | 4.6 | 4.4 | 4.8 | 4.9 | 5.4 |
| Average night temperature (°C) | -0.6 | 0.6 | 0.6 | 0.0 | -0.4 | -0.1 | -0.4 | -0.4 | 0.1 | 0.6 | 0.6 | 1.8 |
| Absolute minimum temperature (°C) | -3.7 | -2.8 | -3.3 | -3.7 | -3.1 | -2.2 | -3.4 | -3.0 | -2.2 | -3.0 | -2.2 | -0.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Daylight mean duration (h) | 12.9 | 12.6 | 12.2 | 11.8 | 11.5 | 11.3 | 11.4 | 11.6 | 12.0 | 12.4 | 12.8 | 13.0 |
| Daylight minimum duration (h) | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 |
| Sunshine mean duration (h) | 9.5 | 9.0 | 9.3 | 10.1 | 10.2 | 10.5 | 10.5 | 10.8 | 10.8 | 10.7 | 10.6 | 10.0 |
| Precipitation (mm) | 252 | 320 | 240 | 107 | 59 | 1 | 19 | 42 | 100 | 171 | 212 | 279 |
| Sunny days | 0 | 0 | 0 | 1 | 13 | 25 | 19 | 9 | 4 | 5 | 1 | 0 |
| Rainy days | 30 | 28 | 31 | 29 | 17 | 3 | 10 | 19 | 26 | 26 | 29 | 31 |
| Snow days | 1 | 0 | 0 | 0 | 1 | 2 | 2 | 3 | 0 | 0 | 0 | 0 |
The largest precipitation sum in San Marcos is at