Sugar River Forest Preserve Weather Forecast

    • 59
    • 83

    Becoming Sunny

    • 60
    • 88

    Mostly Sunny

    • 57
    • 86

    Partly Sunny

    • 53
    • 82

    Partly Sunny

    • 54
    • 81

    Partly Sunny

    • 52
    • 77

    Partly Sunny

Today 25 May Winnebago

Partly cloudy. Highs in the lower 80s. Southwest Winds 5 to 10 Mph, increasing to 10 to 15 Mph in the afternoon.

Tonight 25 May Winnebago

Clear. Lows around 60. South Winds 5 to 10 Mph.

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Sugar River Forest Preserve Temperature Statistics

May Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 2 May, 2026

    30.2 °F

  • Average May

    53.8 °F

  • Highest 17 May, 2026

    84.2 °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

    60.4 °F
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