Lower Arapahoe Weather Forecast

    • 42
    • 66

    Increasing Clouds

    • 40
    • 62

    Partly Sunny

    • 32
    • 63

    Chance Rain

    • 38
    • 52

    Partly Sunny

    • 44
    • 66

    Partly Sunny

    • 35
    • 61

    Partly Sunny

Today 15 Dec Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly sunny. Highs 62 to 68.

Tonight 15 Dec Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly clear. Lows 35 to 43. West Winds 10 to 15 Mph with Gusts up to 20 Mph after midnight.

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Lower Arapahoe Temperature Statistics

December Temperature

Boulder Municipal Airport (3.7 miles)

  • Lowest 4 December, 2025

    10.4 °F

  • Average December

    40.8 °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

    65.2 °F
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