Thornton Weather Forecast

    • 50
    • 81

    Increasing Clouds

    • 45
    • 65

    Rain Showers Likely

    • 41
    • 49

    Rain Showers

    • 37
    • 58

    Chance Rain Showers

    • 38
    • 59

    Mostly Sunny

    • 45
    • 73

    Mostly Sunny

    • 46
    • 73

    Mostly Sunny

Today 12 Oct North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Sunny. Highs in the lower to mid 70s.

Tonight 12 Oct North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Partly cloudy. Lows 43 to 49. West Winds 10 to 15 Mph, becoming north after midnight.

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Thornton Temperature Statistics

October Temperature

Broomfield / Jeffco (6.8 miles)

  • Lowest 2 October, 2026

    46.4 °F

  • Average October

    66 °F

  • Highest 5 October, 2026

    89.6 °F

Climate (2021–2026)

Broomfield / Jeffco (6.8 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    51.7 °F

  • Average High 2021–2026

    66.1 °F
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