Jamestown Weather Forecast

    • 69
    • 90

    Chance Thunderstorms

    • 65
    • 86

    Partly Sunny

    • 63
    • 82

    Partly Sunny

    • 65
    • 81

    Mostly Cloudy

    • 70
    • 85

    Chance Rain Showers

    • 66
    • 85

    Chance Rain Showers

Today 4 Sep Grant

Mostly sunny. A chance of Showers and Thunderstorms in the morning. Humid with Highs in the upper 80s. South Winds 5 to 10 Mph, becoming southwest in the afternoon. Chance of rain 40 percent. Heat index Values up to 100 in the afternoon.

Tonight 4 Sep Grant

A chance of Thunderstorms in the evening. Partly cloudy with a chance of Showers. Humid with Lows in the upper 60s. Southwest Winds around 5 Mph, becoming northeast after midnight. Chance of rain 40 percent. Heat index Values up to 100 early in the evening.

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Jamestown Temperature Statistics

September Temperature

Platteville Municipal Airport (8.7 miles)

  • Lowest 1 September, 2026

    76.6 °F

  • Average September

    84.8 °F

  • Highest 1 September, 2026

    90.9 °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

    58.8 °F
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