Average annual temperature is 14.2 °C
Absolute maximum temperature: 34.6 °C
Absolute minimum temperature: -7.2 °C
Number of sunny days: 183 days
Number of rainy days: 177 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) | 19.7 | 23.6 | 25.4 | 27.7 | 28.5 | 31.0 | 34.4 | 34.6 | 32.2 | 28.4 | 24.5 | 17.6 |
| Average daytime temperature (°C) | 11.2 | 14.4 | 15.2 | 20.6 | 23.9 | 26.8 | 30.6 | 28.7 | 27.1 | 20.9 | 15.5 | 11.3 |
| Average temperature (°C) | 5.6 | 8.2 | 8.7 | 13.5 | 17.3 | 20.4 | 24.1 | 22.9 | 20.4 | 14.7 | 8.5 | 5.7 |
| Average night temperature (°C) | 2.0 | 3.5 | 3.5 | 7.4 | 11.7 | 14.7 | 18.8 | 18.4 | 15.2 | 9.6 | 3.3 | 1.7 |
| Absolute minimum temperature (°C) | -6.8 | -7.2 | -6.6 | 0.5 | 2.3 | 6.8 | 13.2 | 13.8 | 10.9 | 3.5 | -6.7 | -5.8 |
| 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 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.8 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| 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) | 4.8 | 5.8 | 8.2 | 9.4 | 10.6 | 11.2 | 11.4 | 10.2 | 11.0 | 8.3 | 8.0 | 5.8 |
| Precipitation (mm) | 103 | 124 | 103 | 89 | 123 | 55 | 47 | 125 | 63 | 24 | 43 | 69 |
| Sunny days | 12 | 13 | 19 | 17 | 13 | 13 | 9 | 12 | 16 | 23 | 21 | 15 |
| Rainy days | 16 | 15 | 11 | 13 | 18 | 17 | 22 | 19 | 14 | 8 | 9 | 15 |
| Snow days | 3 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Boulder during the most sunny months:
The largest precipitation sum in Boulder is at