Jamestown Weather Forecast

    • 60
    • 75

    Rain Showers

    • 54
    • 67

    Chance Rain Showers

    • 49
    • 63

    Chance Rain Showers

    • 46
    • 61

    Partly Sunny

    • 50
    • 65

    Partly Sunny

    • 52
    • 66

    Partly Sunny

Today 19 Sep Grant

A chance of Thunderstorms. Showers. Some Thunderstorms may produce heavy rainfall. Locally heavy rainfall possible this morning. Highs in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 100 percent.

Tonight 19 Sep Grant

Cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Lows in the upper 50s. Northeast Winds 5 to 10 Mph. Chance of rain 90 percent.

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Jamestown Temperature Statistics

September Temperature

Platteville Municipal Airport (8.7 miles)

  • Lowest 14 September, 2026

    49.8 °F

  • Average September

    71.5 °F

  • Highest 4 September, 2026

    91.6 °F

Climate (2021–2026)

Platteville Municipal Airport (8.7 miles)

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  • Average Low 2021–2026

    40.8 °F

  • Average 2021–2026

    49.9 °F

  • Average High 2021–2026

    58.8 °F
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