Average annual temperature is 11.4 °C
Absolute maximum temperature: 37.7 °C
Absolute minimum temperature: -17.6 °C
Number of sunny days: 247 days
Number of rainy days: 99 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) | 10.2 | 12.7 | 17.7 | 25.7 | 27.6 | 34.6 | 37.7 | 36.4 | 34.1 | 26.4 | 23.0 | 9.6 |
| Average daytime temperature (°C) | 4.4 | 6.3 | 11.1 | 19.3 | 24.3 | 28.7 | 35.2 | 32.2 | 27.6 | 21.9 | 13.7 | 3.3 |
| Average temperature (°C) | -1.2 | -0.6 | 4.1 | 10.0 | 16.5 | 20.3 | 26.9 | 24.1 | 19.4 | 13.6 | 5.6 | -2.4 |
| Average night temperature (°C) | -5.4 | -5.6 | -1.6 | 1.9 | 9.0 | 11.8 | 17.7 | 16.4 | 11.7 | 6.2 | -0.7 | -7.0 |
| Absolute minimum temperature (°C) | -11.7 | -17.6 | -12.7 | -5.6 | 4.6 | 7.4 | 13.6 | 13.7 | 8.1 | -4.2 | -7.4 | -14.0 |
| 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) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 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) | 7.6 | 9.0 | 9.5 | 11.8 | 12.0 | 13.1 | 13.2 | 11.9 | 11.1 | 10.3 | 8.9 | 8.1 |
| Precipitation (mm) | 26 | 26 | 57 | 8 | 18 | 9 | 4 | 8 | 20 | 1 | 15 | 42 |
| Sunny days | 20 | 17 | 14 | 25 | 13 | 20 | 26 | 20 | 19 | 27 | 24 | 22 |
| Rainy days | 6 | 5 | 14 | 5 | 18 | 10 | 5 | 11 | 11 | 4 | 4 | 6 |
| Snow days | 5 | 6 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 |
The best time to visit San Juan during the most sunny months:
The largest precipitation sum in San Juan is at