Whitewater Lake Weather Forecast

    • 45
    • 73

    Partly Sunny

    • 54
    • 74

    Mostly Sunny

    • 59
    • 78

    Rain Showers Likely

    • 44
    • 71

    Chance Thunderstorms

    • 43
    • 64

    Mostly Cloudy

    • 43
    • 61

    Chance Rain Showers

Today 21 Apr Walworth

Warmer. Partly sunny. Chance of Sprinkles in the afternoon. Highs in the lower 70s. Southwest Winds 10 to 15 Mph.

Tonight 21 Apr Walworth

Mostly clear. Lows in the mid 40s. North Winds around 5 Mph shifting to the northeast up to 5 Mph after midnight.

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Whitewater Lake Temperature Statistics

April Temperature

Janesville-Rock County (19.9 miles)

  • Lowest 7 April, 2026

    23 °F

  • Average April

    48.4 °F

  • Highest 17 April, 2026

    78.8 °F

Climate (2021–Present)

Janesville-Rock County (19.9 miles)

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  • Average Low 2021–2026

    40.4 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    60.4 °F
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