Longmont Weather Forecast

    • 65
    • 98

    Slight Chance Thunderstorms

    • 63
    • 97

    Chance Thunderstorms

    • 63
    • 96

    Slight Chance Thunderstorms

    • 60
    • 92

    Rain Showers Likely

    • 56
    • 80

    Rain Showers

    • 56
    • 79

    Rain Showers

    • 56
    • 80

    Thunderstorms Likely

Today 9 Aug Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy with a 20 percent chance of Thunderstorms. Areas of smoke. Highs in the 90s. Northwest Winds 10 to 15 Mph with Gusts up to 20 Mph.

Tonight 9 Aug Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy. Slight chance of Thunderstorms early in the evening. Areas of smoke through the night. Lows 61 to 67. West Winds 10 to 15 Mph with Gusts up to 20 Mph in the Evening, becoming light. Chance of precipitation 20 percent.

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Longmont Temperature Statistics

August Temperature

Vance Brand Airport (3.1 miles)

  • Lowest 5 August, 2026

    50.4 °F

  • Average August

    72.1 °F

  • Highest 3 August, 2026

    100.8 °F

Climate (2021–2026)

Vance Brand Airport (3.1 miles)

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  • Average Low 2021–2026

    38.5 °F

  • Average 2021–2026

    53.4 °F

  • Average High 2021–2026

    68.8 °F
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