Best year time to visit Boulder

General weather information about Boulder

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

Boulder air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)19.921.922.428.132.135.136.237.232.329.725.317.5
Average daytime temperature (°C)8.111.313.120.725.930.131.229.827.120.413.99.9
Average temperature (°C)3.85.57.214.019.723.926.124.821.815.68.75.7
Average night temperature (°C)0.81.42.88.714.418.521.920.617.311.84.62.9
Absolute minimum temperature (°C)-11.1-10.7-5.71.37.013.818.014.312.7-0.6-5.4-5.5

Boulder monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.810.812.013.214.314.814.613.612.411.210.19.5
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)4.97.77.110.211.312.712.410.410.47.97.95.7
Precipitation (mm)92612137963647312660561689
Sunny days121713161920111421202216
Rainy days1510181412102017911815
Snow days410000000000

Best time to visit Boulder:

The best time to visit Boulder during the most sunny months:

  • May — 11.3(h)
  • June — 12.7(h)
  • July — 12.4(h)

The largest precipitation sum in Boulder is at

  • March — 213(mm)
  • August — 126(mm)
  • Frequently asked questions

    When is the best time to visit Boulder?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Boulder.
    What is the weather like in Boulder?
    See average temperature, rainfall and daylight hours for Boulder by month in the table above.
    How many sunny days does Boulder have?
    The monthly weather statistics above show sunshine and rainfall patterns for Boulder throughout the year.