Sugar River Forest Preserve Weather Forecast

    • 70
    • 85

    Increasing Clouds

    • 58
    • 81

    Rain Showers Likely

    • 52
    • 78

    Mostly Sunny

    • 61
    • 80

    Partly Sunny

    • 58
    • 82

    Slight Chance Thunderstorms

    • 58
    • 78

    Chance Thunderstorms

Today 8 Sep Winnebago

Mostly cloudy. Highs in the mid 80s. South Winds 5 to 10 Mph, increasing to 10 to 15 Mph in the afternoon.

Tonight 8 Sep Winnebago

Mostly cloudy. Near steady temperature in the lower 60s. Southeast Winds around 5 Mph.

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Sugar River Forest Preserve Temperature Statistics

September Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 5 September, 2026

    64.4 °F

  • Average September

    76.1 °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

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.3 °F
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