Flagstaff Weather Forecast

    • 31
    • 60

    Increasing Clouds

    • 40
    • 62

    Partly Sunny

    • 39
    • 64

    Mostly Sunny

    • 40
    • 62

    Partly Sunny

    • 33
    • 63

    Slight Chance Rain/Snow

    • 36
    • 54

    Partly Sunny

Today 13 Dec Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Highs near 60. West Winds 10 to 15 Mph, becoming north in the afternoon.

Tonight 13 Dec Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Lows 26 to 32.

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Flagstaff Temperature Statistics

December Temperature

Boulder Municipal Airport (3.7 miles)

  • Lowest 4 December, 2025

    10.4 °F

  • Average December

    39.8 °F

  • Highest 11 December, 2025

    64.4 °F

Climate (2020–Present)

Boulder Municipal Airport (3.7 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    52.7 °F

  • Average High 2020–2025

    65.1 °F
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