Jamestown Weather Forecast

    • 56
    • 75

    Chance Thunderstorms

    • 53
    • 71

    Rain Showers Likely

    • 53
    • 73

    Slight Chance Thunderstorms

    • 53
    • 75

    Partly Sunny

    • 56
    • 76

    Slight Chance Thunderstorms

    • 57
    • 77

    Chance Thunderstorms

Today 30 Aug Larimer and Boulder Counties Between 6000 and 9000 Feet

Mostly cloudy. Chance of Showers in the Morning, then a chance of Thunderstorms in the afternoon. Highs 69 to 79. West Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

Tonight 30 Aug Larimer and Boulder Counties Between 6000 and 9000 Feet

Mostly cloudy. Slight chance of Thunderstorms in the evening. Lows 48 to 58. West Winds 10 to 15 Mph with Gusts up to 20 Mph in the Evening, becoming light. Chance of precipitation 20 percent.

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Jamestown Temperature Statistics

August Temperature

Boulder Municipal Airport (9.9 miles)

  • Lowest 5 August, 2026

    50 °F

  • Average August

    76.2 °F

  • Highest 2 August, 2026

    104 °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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