Jamestown Weather Forecast

    • 49
    • 67

    Chance Thunderstorms

    • 46
    • 57

    Rain Showers Likely

    • 49
    • 66

    Chance Rain Showers

    • 49
    • 71

    Mostly Sunny

    • 51
    • 72

    Partly Sunny

    • 46
    • 68

    Rain Showers Likely

Today 23 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Mostly cloudy. Slight chance of Showers in the Morning, then a chance of Showers and slight chance of Thunderstorms in the afternoon. Highs 64 to 74. Chance of rain 40 percent.

Tonight 23 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Mostly cloudy with a 30 percent chance of Showers. Lows 44 to 54.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Jamestown Temperature Statistics

September Temperature

Boulder Municipal Airport (9.9 miles)

  • Lowest 16 September, 2026

    51.8 °F

  • Average September

    71.2 °F

  • Highest 13 September, 2026

    96.8 °F

Climate (2021–2026)

Boulder Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    41.4 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    66.4 °F
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