Jamestown Weather Forecast

    • 35
    • 55

    Chance Thunderstorms

    • 37
    • 54

    Chance Rain/Snow

    • 40
    • 60

    Chance Rain Showers

    • 46
    • 70

    Slight Chance Thunderstorms

    • 48
    • 72

    Chance Thunderstorms

    • 46
    • 68

    Rain Showers Likely

    • 47
    • 67

    Chance Thunderstorms

Today 21 May Larimer and Boulder Counties Between 6000 and 9000 Feet

Chance of Thunderstorms. Showers likely late in the afternoon. Highs 52 to 60. Chance of rain 60 percent.

Tonight 21 May Larimer and Boulder Counties Between 6000 and 9000 Feet

Becoming partly cloudy after midnight. Rain Showers Likely, chance of snow Showers and slight chance of Thunderstorms in the Evening, then a slight chance of rain and snow Showers after midnight. Little or no snow accumulation. Lows 28 to 38. Chance of precipitation 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Jamestown Temperature Statistics

May Temperature

Boulder Municipal Airport (9.9 miles)

  • Lowest 1 May, 2026

    32 °F

  • Average May

    57.5 °F

  • Highest 11 May, 2026

    87.8 °F

Climate (2021–Present)

Boulder Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    41.2 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    66.2 °F
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