Average annual temperature is 14.8 °C
Absolute maximum temperature: 37.2 °C
Absolute minimum temperature: -11.1 °C
Number of sunny days: 201 days
Number of rainy days: 159 days
Number of snow days: 5 days
Look at detailed online map of Boulder
* Weather data for Boulder 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) | 19.9 | 21.9 | 22.4 | 28.1 | 32.1 | 35.1 | 36.2 | 37.2 | 32.3 | 29.7 | 25.3 | 17.5 |
| Average daytime temperature (°C) | 8.1 | 11.3 | 13.1 | 20.7 | 25.9 | 30.1 | 31.2 | 29.8 | 27.1 | 20.4 | 13.9 | 9.9 |
| Average temperature (°C) | 3.8 | 5.5 | 7.2 | 14.0 | 19.7 | 23.9 | 26.1 | 24.8 | 21.8 | 15.6 | 8.7 | 5.7 |
| Average night temperature (°C) | 0.8 | 1.4 | 2.8 | 8.7 | 14.4 | 18.5 | 21.9 | 20.6 | 17.3 | 11.8 | 4.6 | 2.9 |
| Absolute minimum temperature (°C) | -11.1 | -10.7 | -5.7 | 1.3 | 7.0 | 13.8 | 18.0 | 14.3 | 12.7 | -0.6 | -5.4 | -5.5 |
| 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 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.6 | 13.6 | 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) | 4.9 | 7.7 | 7.1 | 10.2 | 11.3 | 12.7 | 12.4 | 10.4 | 10.4 | 7.9 | 7.9 | 5.7 |
| Precipitation (mm) | 92 | 61 | 213 | 79 | 63 | 64 | 73 | 126 | 60 | 56 | 16 | 89 |
| Sunny days | 12 | 17 | 13 | 16 | 19 | 20 | 11 | 14 | 21 | 20 | 22 | 16 |
| Rainy days | 15 | 10 | 18 | 14 | 12 | 10 | 20 | 17 | 9 | 11 | 8 | 15 |
| Snow days | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Boulder during the most sunny months:
The largest precipitation sum in Boulder is at