Thornton Weather Forecast

    • 61
    • 81

    Slight Chance Thunderstorms

    • 65
    • 92

    Slight Chance Thunderstorms

    • 60
    • 87

    Chance Rain Showers

    • 57
    • 76

    Rain Showers Likely

    • 57
    • 82

    Chance Thunderstorms

    • 58
    • 80

    Chance Rain Showers

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

Partly cloudy. Slight chance of Showers early in the Afternoon, then a slight chance of Thunderstorms late in the afternoon. Highs 75 to 83. Southeast Winds 10 to 15 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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

Mostly clear. Slight chance of Showers early in the evening. Lows 54 to 60. Chance of rain 20 percent.

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Thornton Temperature Statistics

September Temperature

Broomfield / Jeffco (6.8 miles)

  • Lowest 10 September, 2026

    53.6 °F

  • Average September

    71.8 °F

  • Highest 5 September, 2026

    93.2 °F

Climate (2021–2026)

Broomfield / Jeffco (6.8 miles)

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  • Average Low 2021–2026

    42.1 °F

  • Average 2021–2026

    51.7 °F

  • Average High 2021–2026

    66 °F
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