Sugar River Forest Preserve Weather Forecast

    • 49
    • 61

    Chance Rain Showers

    • 49
    • 65

    Mostly Cloudy

    • 49
    • 65

    Mostly Cloudy

    • 46
    • 66

    Mostly Cloudy

    • 49
    • 65

    Slight Chance Rain Showers

    • 53
    • 68

    Partly Sunny

Today 22 Sep Winnebago

Mostly cloudy. A chance of Showers, mainly in the morning. Highs in the lower 60s. Northeast Winds 10 to 15 Mph. Chance of precipitation 50 percent.

Tonight 22 Sep Winnebago

Partly cloudy. Lows in the upper 40s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sugar River Forest Preserve Temperature Statistics

September Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    66.8 °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

    60.2 °F
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