Whitewater Lake Weather Forecast

    • 58
    • 80

    Rain Showers Likely

    • 52
    • 75

    Mostly Sunny

    • 61
    • 78

    Mostly Sunny

    • 57
    • 79

    Chance Rain Showers

    • 62
    • 77

    Chance Rain Showers

    • 63
    • 82

    Rain Showers Likely

Today 9 Sep Walworth

Cloudy with light Showers likely and slight chance of Thunderstorms in the Morning, then mostly cloudy with chance of light Showers late in the morning. Partly sunny in the afternoon. Highs in the upper 70s. West Winds 5 to 10 Mph. Chance of precipitation 70 percent.

Tonight 9 Sep Walworth

Cooler. Partly cloudy. Lows in the upper 50s. Northwest Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Whitewater Lake Temperature Statistics

September Temperature

Janesville-Rock County (19.9 miles)

  • Lowest 6 September, 2026

    57.2 °F

  • Average September

    74.4 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (19.9 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.3 °F
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