Jamestown Weather Forecast

    • 48
    • 59

    Chance Thunderstorms

    • 44
    • 53

    Rain Showers Likely

    • 43
    • 59

    Chance Rain Showers

    • 46
    • 66

    Mostly Sunny

    • 46
    • 68

    Mostly Sunny

    • 48
    • 67

    Mostly Sunny

    • 50
    • 70

    Partly Sunny

Today 29 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Mostly sunny. Highs 66 to 76.

Tonight 29 Sep Larimer and Boulder Counties Between 6000 and 9000 Feet

Mostly cloudy with a 10 percent chance of Showers. Lows 40 to 50.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Jamestown Temperature Statistics

September Temperature

Boulder Municipal Airport (9.9 miles)

  • Lowest 22 September, 2026

    50 °F

  • Average September

    70.3 °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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