Sugar River Forest Preserve Weather Forecast

    • 48
    • 71

    Mostly Sunny

    • 57
    • 74

    Partly Sunny

    • 47
    • 73

    Slight Chance Thunderstorms

    • 47
    • 70

    Partly Sunny

    • 50
    • 71

    Partly Sunny

    • 53
    • 74

    Partly Sunny

Today 26 Aug Winnebago

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the lower 70s. Northwest Winds 5 to 10 Mph.

Tonight 26 Aug Winnebago

Partly cloudy early in the Evening, then becoming mostly clear. Lows in the upper 40s. West Winds around 5 Mph.

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Sugar River Forest Preserve Temperature Statistics

August Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 2 August, 2025

    50 °F

  • Average August

    69.3 °F

  • Highest 8 August, 2025

    89.6 °F

Climate (2020–Present)

Janesville-Rock County (14.3 miles)

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  • Average Low 2020–2025

    40.5 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    60.3 °F
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