Sugar River Forest Preserve Weather Forecast

    • 38
    • 79

    Rain Showers

    • 30
    • 48

    Chance Rain Showers

    • 29
    • 49

    Mostly Sunny

    • 47
    • 59

    Partly Sunny

Today 17 Apr Winnebago

Partly cloudy in the Morning, then becoming mostly cloudy. A slight chance of Showers and Thunderstorms early in the afternoon. A chance of Showers and Thunderstorms late. Breezy. Highs around 80. Southeast Winds 15 to 20 Mph, becoming south 15 to 25 Mph in the afternoon. Gusts up to 35 Mph. Chance of precipitation 50 percent.

Tonight 17 Apr Winnebago

Mostly cloudy. Showers with Thunderstorms likely in the Evening, then a chance of Showers after midnight. Breezy with Lows in the upper 30s. Southwest Winds 15 to 20 Mph, becoming northwest after midnight. Gusts up to 30 Mph. Chance of precipitation 90 percent.

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Sugar River Forest Preserve Temperature Statistics

April Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 7 April, 2026

    23 °F

  • Average April

    45.8 °F

  • Highest 12 April, 2026

    75.2 °F

Climate (2021–Present)

Janesville-Rock County (14.3 miles)

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  • Average Low 2021–2026

    40.4 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.4 °F
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