Boulder Weather Forecast

    • 43
    • 63

    Partly Sunny

    • 41
    • 71

    Partly Sunny

    • 41
    • 67

    Mostly Cloudy

    • 43
    • 67

    Partly Sunny

    • 40
    • 66

    Partly Sunny

    • 34
    • 60

    Mostly Cloudy

    • 30
    • 52

    Slight Chance Rain/Snow

Today 21 Dec Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Highs 55 to 61.

Tonight 21 Dec Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Lows 37 to 43. West Winds 10 to 15 Mph with Gusts up to 20 Mph after midnight.

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Boulder Temperature Statistics

December Temperature

Boulder Municipal Airport (2.5 miles)

  • Lowest 4 December, 2025

    10.4 °F

  • Average December

    43.8 °F

  • Highest 19 December, 2025

    69.8 °F

Climate (2020–Present)

Boulder Municipal Airport (2.5 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    65.2 °F
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