Boulder Municipal Airport Weather Forecast

    • 55
    • 85

    Slight Chance Thunderstorms

    • 55
    • 83

    Slight Chance Thunderstorms

    • 56
    • 85

    Slight Chance Thunderstorms

    • 56
    • 83

    Chance Thunderstorms

    • 51
    • 79

    Chance Thunderstorms

    • 49
    • 76

    Slight Chance Thunderstorms

Today 8 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy until late Afternoon, then mostly cloudy with a slight chance of Thunderstorms late in the afternoon. Some Thunderstorms may produce gusty Winds late in the afternoon. Highs in the mid to upper 80s. Chance of precipitation 20 percent.

Tonight 8 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Slight chance of Thunderstorms in the evening. Some Thunderstorms may produce gusty Winds in the evening. Lows in the 50s. Chance of precipitation 20 percent.

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Boulder Municipal Airport Temperature Statistics

September Temperature

Boulder Municipal Airport (0 miles)

  • Lowest 6 September, 2025

    44.6 °F

  • Average September

    67.9 °F

  • Highest 3 September, 2025

    87.8 °F

Climate (2020–Present)

Boulder Municipal Airport (0 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    52.5 °F

  • Average High 2020–2025

    64.9 °F
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