Jefferson Weather Forecast

    • 44
    • 75

    Chance Thunderstorms

    • 44
    • 73

    Chance Thunderstorms

    • 45
    • 74

    Chance Thunderstorms

    • 42
    • 73

    Chance Thunderstorms

    • 42
    • 72

    Chance Thunderstorms

    • 44
    • 74

    Chance Thunderstorms

Today 4 Sep South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and Wes

Mostly sunny in the Morning, then mostly cloudy with a slight chance of Thunderstorms early in the afternoon. Mostly cloudy with a chance of Thunderstorms late in the afternoon. Highs 64 to 74. Chance of precipitation 30 percent.

Tonight 4 Sep South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and Wes

Mostly cloudy with a chance of Showers and slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows 41 to 51. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Jefferson Temperature Statistics

September Temperature

Copper Mountain - Red Cliff Pass (19.9 miles)

  • Lowest 1 September, 2026

    39.2 °F

  • Average September

    45.3 °F

  • Highest 2 September, 2026

    57.2 °F

Climate (2021–2026)

Copper Mountain - Red Cliff Pass (19.9 miles)

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  • Average Low 2021–2026

    29.4 °F

  • Average 2021–2026

    35.8 °F

  • Average High 2021–2026

    42.1 °F
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