Sugar River Forest Preserve Weather Forecast

    • 60
    • 85

    Partly Sunny

    • 61
    • 83

    Chance Thunderstorms

    • 61
    • 78

    Chance Rain Showers

    • 61
    • 77

    Chance Thunderstorms

    • 59
    • 77

    Chance Rain Showers

    • 56
    • 76

    Slight Chance Thunderstorms

Today 18 Sep Winnebago

Partly cloudy. Highs in the mid 80s. Southeast Winds around 5 Mph.

Tonight 18 Sep Winnebago

Partly cloudy. Lows around 60. East Winds 5 to 10 Mph.

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Sugar River Forest Preserve Temperature Statistics

September Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 7 September, 2025

    39.2 °F

  • Average September

    59.4 °F

  • Highest 14 September, 2025

    84.2 °F

Climate (2020–Present)

Janesville-Rock County (14.3 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.3 °F
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