Whitewater Lake Weather Forecast

    • 61
    • 85

    Increasing Clouds

    • 62
    • 82

    Chance Thunderstorms

    • 61
    • 78

    Chance Thunderstorms

    • 61
    • 77

    Chance Thunderstorms

    • 59
    • 77

    Chance Rain Showers

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    • 75

    Chance Rain Showers

Today 18 Sep Walworth

Sunny. Highs in the mid 80s. South Winds up to 5 Mph shifting to the east around 5 Mph in the afternoon.

Tonight 18 Sep Walworth

Partly cloudy through around midnight then becoming mostly cloudy. Lows in the lower 60s. East Winds up to 5 Mph.

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Whitewater Lake Temperature Statistics

September Temperature

Janesville-Rock County (19.9 miles)

  • Lowest 7 September, 2025

    39.2 °F

  • Average September

    59.4 °F

  • Highest 14 September, 2025

    84.2 °F

Climate (2020–Present)

Janesville-Rock County (19.9 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.3 °F
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