Average annual temperature is 13.5 °C
Absolute maximum temperature: 38.7 °C
Absolute minimum temperature: -14.3 °C
Number of sunny days: 245 days
Number of rainy days: 101 days
Number of snow days: 19 days
Look at detailed online map of San Juan
* Weather data for San Juan United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 14.9 | 15.8 | 18.8 | 26.5 | 28.8 | 34.9 | 38.7 | 37.2 | 33.5 | 27.1 | 22.7 | 14.3 |
| Average daytime temperature (°C) | 7.4 | 9.5 | 12.7 | 20.2 | 25.1 | 29.1 | 35.2 | 31.9 | 28.3 | 22.2 | 14.2 | 8.1 |
| Average temperature (°C) | 1.8 | 2.7 | 6.0 | 11.9 | 17.2 | 21.8 | 27.4 | 25.0 | 21.4 | 14.6 | 7.8 | 3.0 |
| Average night temperature (°C) | -1.9 | -2.2 | 0.4 | 4.5 | 10.3 | 14.1 | 19.6 | 18.5 | 15.0 | 8.2 | 3.1 | -0.6 |
| Absolute minimum temperature (°C) | -11.4 | -14.3 | -9.4 | -4.3 | 5.3 | 9.7 | 15.7 | 14.7 | 10.7 | -5.8 | -7.1 | -7.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 8.1 | 8.9 | 10.0 | 11.6 | 11.4 | 12.7 | 12.8 | 11.5 | 10.9 | 10.1 | 8.4 | 7.9 |
| Precipitation (mm) | 11 | 20 | 36 | 6 | 80 | 29 | 4 | 29 | 30 | 5 | 21 | 27 |
| Sunny days | 21 | 18 | 17 | 26 | 13 | 17 | 22 | 18 | 22 | 25 | 22 | 24 |
| Rainy days | 5 | 4 | 10 | 4 | 18 | 13 | 9 | 13 | 8 | 5 | 6 | 6 |
| Snow days | 5 | 6 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 1 |
The largest precipitation sum in San Juan is at