Thornton Weather Forecast

    • 61
    • 82

    Thunderstorms Likely

    • 61
    • 85

    Thunderstorms Likely

    • 61
    • 83

    Rain Showers Likely

    • 57
    • 82

    Chance Thunderstorms

    • 59
    • 85

    Slight Chance Thunderstorms

    • 61
    • 89

    Partly Sunny

Today 13 Aug North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Slight chance of Thunderstorms in the Morning, then Thunderstorms likely in the afternoon. Some Thunderstorms may produce heavy rainfall in the late morning and afternoon. Highs 77 to 83. Chance of precipitation 70 percent.

Tonight 13 Aug North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Showers likely and chance of Thunderstorms in the Evening, then partly cloudy with a slight chance of Showers after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Lows in the mid 50s to lower 60s. Chance of rain 70 percent.

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Thornton Temperature Statistics

August Temperature

Broomfield / Jeffco (6.8 miles)

  • Lowest 4 August, 2026

    51.8 °F

  • Average August

    75.3 °F

  • Highest 2 August, 2026

    102.2 °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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