Sugar River Forest Preserve Weather Forecast

    • 29
    • 41

    Rain/Snow Likely

    • 20
    • 34

    Chance Rain/Snow

    • 21
    • 30

    Partly Sunny

    • 31
    • 39

    Mostly Cloudy

    • 27
    • 42

    Mostly Cloudy

Today 9 Jan Winnebago

Mostly cloudy in the Morning, then becoming partly cloudy. A chance of Showers early in the Morning, then a slight chance of Showers late in the morning. Breezy. Near steady temperature around 40. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming north 10 to 15 Mph in the afternoon. Chance of precipitation 30 percent.

Tonight 9 Jan Winnebago

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 30. North Winds around 5 Mph, becoming southeast after midnight.

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Sugar River Forest Preserve Temperature Statistics

January Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 1 January, 2026

    8.6 °F

  • Average January

    24.5 °F

  • Highest 6 January, 2026

    39.2 °F

Climate (2021–Present)

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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