Thornton Weather Forecast

    • 55
    • 84

    Partly Sunny

    • 52
    • 80

    Chance Thunderstorms

    • 44
    • 76

    Rain Showers

    • 36
    • 52

    Rain Showers Likely

    • 40
    • 57

    Chance Thunderstorms

    • 45
    • 66

    Slight Chance Thunderstorms

Today 15 May North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Mostly sunny. Highs in the lower to mid 80s. Southeast Winds 10 to 15 Mph in the afternoon.

Tonight 15 May North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Mostly cloudy in the Evening, then becoming partly cloudy. Lows 48 to 54.

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Thornton Temperature Statistics

May Temperature

Broomfield / Jeffco (6.8 miles)

  • Lowest 5 May, 2026

    32 °F

  • Average May

    54 °F

  • Highest 11 May, 2026

    87.8 °F

Climate (2021–Present)

Broomfield / Jeffco (6.8 miles)

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  • Average Low 2021–2026

    42.1 °F

  • Average 2021–2026

    51.5 °F

  • Average High 2021–2026

    65.9 °F
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