Thornton Weather Forecast

    • 33
    • 70

    Chance Rain/Snow

    • 36
    • 49

    Increasing Clouds

    • 45
    • 67

    Partly Sunny

    • 31
    • 57

    Slight Chance Rain

    • 39
    • 56

    Partly Sunny

    • 38
    • 67

    Partly Sunny

    • 36
    • 59

    Partly Sunny

Today 17 Dec North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Partly cloudy. Highs in the upper 60s. Southwest Winds 15 to 25 Mph. Gusts up to 40 Mph in the afternoon.

Tonight 17 Dec North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Patchy blowing dust in the evening. Mostly cloudy with a chance of rain early in the Evening, then mostly cloudy with a chance of rain and snow during the late evening hours. Mostly clear after midnight. Windy. Lows near 30. Northwest Winds 20 to 30 Mph. Gusts up to 50 Mph, decreasing to 40 Mph after midnight. Chance of precipitation 30 percent.

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Thornton Temperature Statistics

December Temperature

Broomfield / Jeffco (6.8 miles)

  • Lowest 1 December, 2025

    14 °F

  • Average December

    41.2 °F

  • Highest 11 December, 2025

    66.2 °F

Climate (2020–Present)

Broomfield / Jeffco (6.8 miles)

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  • Average Low 2020–2025

    41.4 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    65 °F
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