Jamestown Weather Forecast

    • 49
    • 75

    Chance Rain Showers

    • 50
    • 67

    Chance Thunderstorms

    • 55
    • 71

    Chance Thunderstorms

    • 52
    • 68

    Rain Showers

    • 49
    • 71

    Rain Showers Likely

    • 47
    • 66

    Chance Thunderstorms

    • 47
    • 65

    Slight Chance Thunderstorms

Today 14 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Partly cloudy. Slight chance of Showers early in the Afternoon, then a slight chance of Thunderstorms late in the afternoon. Highs 71 to 81. West Winds 10 to 20 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

Tonight 14 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Partly cloudy with a 40 percent chance of Showers. Lows 41 to 51. West Winds 10 to 15 Mph with Gusts up to 30 Mph in the Evening, becoming light.

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Jamestown Temperature Statistics

September Temperature

Boulder Municipal Airport (9.9 miles)

  • Lowest 10 September, 2026

    53.6 °F

  • Average September

    73.8 °F

  • Highest 4 September, 2026

    95 °F

Climate (2021–2026)

Boulder Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    41.3 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    66.4 °F
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