Mount Vernon Weather Forecast

    • 43
    • 69

    Rain Showers Likely

    • 41
    • 59

    Rain Showers Likely

    • 41
    • 62

    Chance Rain Showers

    • 44
    • 68

    Mostly Sunny

    • 47
    • 73

    Partly Sunny

    • 48
    • 73

    Partly Sunny

Today 16 Sep Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below

Partly cloudy in the Morning, then Showers likely and chance of Thunderstorms in the afternoon. Highs 65 to 75. Chance of rain 60 percent.

Tonight 16 Sep Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below

Showers likely and chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Lows 39 to 49. Chance of rain 60 percent.

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Mount Vernon Temperature Statistics

September Temperature

Broomfield / Jeffco (15.5 miles)

  • Lowest 6 September, 2025

    48.2 °F

  • Average September

    66.7 °F

  • Highest 10 September, 2025

    91.4 °F

Climate (2020–Present)

Broomfield / Jeffco (15.5 miles)

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  • Average Low 2020–2025

    41.3 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    64.9 °F
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