Sugar River Forest Preserve Weather Forecast

    • 61
    • 74

    Rain Showers Likely

    • 64
    • 69

    Rain Showers

    • 52
    • 69

    Rain Showers

    • 45
    • 65

    Partly Sunny

    • 47
    • 65

    Partly Sunny

    • 42
    • 65

    Mostly Sunny

Today 29 Sep Winnebago

Partly cloudy in the Morning, then becoming mostly cloudy. Patchy fog early in the morning. Highs in the mid 70s. South Winds 5 to 10 Mph.

Tonight 29 Sep Winnebago

Mostly cloudy. A slight chance of Showers late in the evening. A chance of Showers after Midnight, then Showers likely late. Lows in the lower 60s. South Winds 5 to 10 Mph. Chance of precipitation 70 percent.

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Sugar River Forest Preserve Temperature Statistics

September Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    63.9 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

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

    60.2 °F
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