Whitewater Lake Weather Forecast

    • 37
    • 50

    Rain

    • 30
    • 42

    Snow

    • 19
    • 33

    Snow

    • 17
    • 28

    Partly Sunny

    • 27
    • 35

    Mostly Cloudy

    • 26
    • 37

    Cloudy

Today 8 Jan Walworth

Not as cool. Rain in the afternoon. Highs around 50. South Winds 5 to 15 Mph. Chance of rain near 100 percent.

Tonight 8 Jan Walworth

Rain through around Midnight, then chance of light rain after midnight. Lows in the upper 30s. South Winds 10 to 15 Mph shifting to the southwest after midnight. Chance of rain near 100 percent.

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Whitewater Lake Temperature Statistics

January Temperature

Janesville-Rock County (19.9 miles)

  • Lowest 1 January, 2026

    8.6 °F

  • Average January

    22.4 °F

  • Highest 5 January, 2026

    37.4 °F

Climate (2021–Present)

Janesville-Rock County (19.9 miles)

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  • Average Low 2021–2026

    40.4 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.2 °F
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