Jamestown Weather Forecast

    • 72
    • 88

    Increasing Clouds

    • 73
    • 89

    Decreasing Clouds

    • 72
    • 90

    Chance Thunderstorms

    • 71
    • 86

    Chance Thunderstorms

    • 69
    • 87

    Slight Chance Thunderstorms

    • 66
    • 84

    Slight Chance Thunderstorms

    • 65
    • 82

    Partly Sunny

Today 31 Aug Grant

Mostly sunny with a 50 percent chance of Showers. Warmer with Highs in the upper 80s. Southwest Winds 5 to 10 Mph.

Tonight 31 Aug Grant

Partly cloudy. Patchy fog after midnight. Lows in the lower 70s. Southwest Winds around 5 Mph this Evening, becoming light and variable. Heat index Values in the mid 90s early this evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Jamestown Temperature Statistics

August Temperature

Platteville Municipal Airport (8.7 miles)

  • Lowest 23 August, 2026

    53.1 °F

  • Average August

    72.1 °F

  • Highest 10 August, 2026

    84.2 °F

Climate (2021–2026)

Platteville Municipal Airport (8.7 miles)

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  • Average Low 2021–2026

    40.7 °F

  • Average 2021–2026

    49.9 °F

  • Average High 2021–2026

    58.7 °F
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