Sun Valley Weather Forecast

    • 42
    • 71

    Breezy

    • 31
    • 58

    Slight Chance Rain

    • 38
    • 59

    Partly Sunny

    • 38
    • 69

    Partly Sunny

    • 40
    • 67

    Partly Sunny

    • 41
    • 68

    Partly Sunny

    • 38
    • 65

    Mostly Sunny

Today 19 Dec North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Partly cloudy. Highs around 70. Southwest Winds 15 to 25 Mph with Gusts up to 30 Mph.

Tonight 19 Dec North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Partly cloudy. Patchy blowing dust after midnight. Windy. Lows near 40. Southwest Winds 10 to 20 Mph, becoming west 20 to 30 Mph after midnight. Gusts up to 40 Mph.

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Sun Valley Temperature Statistics

December Temperature

Broomfield / Jeffco (11.8 miles)

  • Lowest 1 December, 2025

    14 °F

  • Average December

    42.4 °F

  • Highest 11 December, 2025

    66.2 °F

Climate (2020–Present)

Broomfield / Jeffco (11.8 miles)

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  • Average Low 2020–2025

    41.5 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    65 °F
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