Jamestown Weather Forecast

    • 62
    • 79

    Increasing Clouds

    • 69
    • 83

    Mostly Cloudy

    • 59
    • 82

    Slight Chance Rain Showers

    • 56
    • 77

    Mostly Sunny

    • 62
    • 80

    Partly Sunny

    • 62
    • 80

    Chance Thunderstorms

Today 7 Sep Grant

Patchy dense fog in the morning. Mostly sunny. Highs around 80. Southeast Winds 5 to 10 Mph.

Tonight 7 Sep Grant

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the lower 60s. Southeast Winds 5 to 10 Mph.

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Jamestown Temperature Statistics

September Temperature

Platteville Municipal Airport (8.7 miles)

  • Lowest 2 September, 2026

    70.7 °F

  • Average September

    80.9 °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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