Boulder Weather Forecast

    • 51
    • 80

    Sunny

    • 53
    • 83

    Sunny

    • 53
    • 84

    Sunny

    • 53
    • 84

    Mostly Sunny

    • 53
    • 83

    Mostly Sunny

    • 51
    • 81

    Slight Chance Thunderstorms

Today 25 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Sunny. Highs around 80.

Tonight 25 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Clear. Lows around 50.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Boulder Temperature Statistics

September Temperature

Boulder Municipal Airport (2.5 miles)

  • Lowest 16 September, 2023

    44.6 °F

  • Average September

    66.9 °F

  • Highest 1 September, 2023

    95 °F

Climate (2010–Present)

Boulder Municipal Airport (2.5 miles)

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  • Average Low 2010–Present

    40.7 °F

  • Average 2010–Present

    52.7 °F

  • Average High 2010–Present

    65 °F
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