Jamestown Weather Forecast

    • 44
    • 65

    Rain Showers Likely

    • 43
    • 59

    Rain Showers

    • 43
    • 58

    Chance Rain Showers

    • 47
    • 66

    Mostly Sunny

    • 50
    • 70

    Partly Sunny

    • 49
    • 68

    Slight Chance Thunderstorms

Today 16 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Partly cloudy with a slight chance of Thunderstorms in the Morning, then rain Showers likely and chance of Thunderstorms in the afternoon. Highs 60 to 70. Chance of rain 70 percent.

Tonight 16 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Rain Showers and chance of Thunderstorms in the Evening, then a chance of rain Showers and slight chance of Thunderstorms after midnight. Lows 37 to 47.

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Jamestown Temperature Statistics

September Temperature

Boulder Municipal Airport (9.9 miles)

  • Lowest 6 September, 2025

    44.6 °F

  • Average September

    68.6 °F

  • Highest 10 September, 2025

    91.4 °F

Climate (2020–Present)

Boulder Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    65 °F
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