Thornton Weather Forecast

    • 45
    • 56

    Increasing Clouds

    • 35
    • 65

    Partly Sunny

    • 37
    • 58

    Partly Sunny

    • 30
    • 62

    Mostly Sunny

    • 38
    • 61

    Partly Sunny

    • 36
    • 61

    Partly Sunny

    • 35
    • 61

    Partly Sunny

Today 10 Dec North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Partly cloudy. Highs in the mid 50s to lower 60s. West Winds 10 to 15 Mph with Gusts up to 20 Mph in the afternoon.

Tonight 10 Dec North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Mostly clear. Lows in the lower 40s. Southwest Winds 10 to 15 Mph with Gusts up to 20 Mph.

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Thornton Temperature Statistics

December Temperature

Broomfield / Jeffco (6.8 miles)

  • Lowest 1 December, 2025

    14 °F

  • Average December

    34 °F

  • Highest 8 December, 2025

    53.6 °F

Climate (2020–Present)

Broomfield / Jeffco (6.8 miles)

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  • Average Low 2020–2025

    41.4 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    64.9 °F
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