Weather in Boulder in August

General weather information about Boulder

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

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* 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)19.723.625.427.728.531.034.434.632.228.424.517.6
Average daytime temperature (°C)11.214.415.220.623.926.830.628.727.120.915.511.3
Average temperature (°C)5.68.28.713.517.320.424.122.920.414.78.55.7
Average night temperature (°C)2.03.53.57.411.714.718.818.415.29.63.31.7
Absolute minimum temperature (°C)-6.8-7.2-6.60.52.36.813.213.810.93.5-6.7-5.8

Boulder monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.012.011.010.09.0
Daylight mean duration (h)10.010.812.013.114.114.614.413.512.411.310.29.7
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)4.85.88.29.410.611.211.410.211.08.38.05.8
Precipitation (mm)10312410389123554712563244369
Sunny days12131917131391216232115
Rainy days1615111318172219148915
Snow days301000000001

Boulder - weather forecast by months

Boulder weather in januaryBoulder weather in februaryBoulder weather in marchBoulder weather in aprilBoulder weather in mayBoulder weather in juneBoulder weather in julyBoulder weather in augustBoulder weather in septemberBoulder weather in octoberBoulder weather in novemberBoulder weather in december

Best time to visit Boulder:

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

  • June — 11.2(h)
  • July — 11.4(h)
  • September — 11.0(h)

The largest precipitation sum in Boulder is at

  • January — 103(mm)
  • February — 124(mm)
  • March — 103(mm)
  • May — 123(mm)
  • August — 125(mm)

    • Weather forecast in the closest to Boulder admin centers

    Weather forecast in the closest towns to Boulder

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    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.