Thornton Weather Forecast

    • 52
    • 67

    Chance Thunderstorms

    • 55
    • 79

    Mostly Sunny

    • 63
    • 90

    Mostly Sunny

    • 58
    • 98

    Hot

    • 59
    • 86

    Mostly Sunny

    • 62
    • 91

    Mostly Sunny

Today 14 Jun North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Mostly cloudy. Patchy smoke early in the morning. Slight chance of Showers in the Morning, then a slight chance of Thunderstorms in the afternoon. Highs 59 to 69. East Winds 10 to 15 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 14 Jun North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Mostly cloudy with a chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows 44 to 52. Northeast Winds 10 to 15 Mph with Gusts up to 20 Mph in the Evening, becoming light. Chance of precipitation 30 percent.

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Thornton Temperature Statistics

June Temperature

Broomfield / Jeffco (6.8 miles)

  • Lowest 11 June, 2026

    46.4 °F

  • Average June

    68 °F

  • Highest 6 June, 2026

    93.2 °F

Climate (2021–Present)

Broomfield / Jeffco (6.8 miles)

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  • Average Low 2021–2026

    42.1 °F

  • Average 2021–2026

    51.6 °F

  • Average High 2021–2026

    65.9 °F
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