Average annual temperature is 5.5 °C
Absolute maximum temperature: 32.7 °C
Absolute minimum temperature: -17.1 °C
Number of sunny days: 181 days
Number of rainy days: 108 days
Number of snow days: 76 days
Look at detailed online map of San Juan (historical)
* Weather data for San Juan (historical) 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) | 0.0 | 1.5 | 2.5 | 15.4 | 20.2 | 22.6 | 32.7 | 27.1 | 24.0 | 19.5 | 15.4 | 9.3 |
| Average daytime temperature (°C) | -3.7 | -2.4 | -3.3 | 4.7 | 13.0 | 17.0 | 27.6 | 23.0 | 18.2 | 13.2 | 6.8 | 4.3 |
| Average temperature (°C) | -6.6 | -5.5 | -6.1 | 0.9 | 8.3 | 12.0 | 22.3 | 17.7 | 13.0 | 7.8 | 2.0 | -0.2 |
| Average night temperature (°C) | -9.3 | -8.0 | -8.9 | -2.1 | 3.9 | 7.1 | 17.3 | 12.7 | 8.5 | 3.5 | -1.7 | -3.8 |
| Absolute minimum temperature (°C) | -15.0 | -16.5 | -17.1 | -14.1 | -4.5 | 0.1 | 12.9 | 7.5 | 0.4 | -7.5 | -10.8 | -12.7 |
| 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 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.4 | 11.2 | 10.1 | 9.5 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.9 | 8.7 | 8.7 | 11.8 | 12.4 | 13.1 | 12.9 | 11.6 | 10.6 | 9.6 | 8.3 | 7.6 |
| Precipitation (mm) | 106 | 42 | 90 | 10 | 87 | 38 | 22 | 111 | 86 | 16 | 17 | 15 |
| Sunny days | 8 | 16 | 8 | 23 | 8 | 11 | 24 | 9 | 13 | 21 | 22 | 18 |
| Rainy days | 0 | 2 | 2 | 2 | 19 | 19 | 7 | 22 | 17 | 10 | 5 | 3 |
| Snow days | 23 | 10 | 21 | 5 | 4 | 0 | 0 | 0 | 0 | 0 | 3 | 10 |
The best time to visit San Juan (historical) during the most sunny months:
The largest precipitation sum in San Juan (historical) is at