Sugar River Forest Preserve Weather Forecast

    • 63
    • 79

    Chance Thunderstorms

    • 56
    • 78

    Partly Sunny

    • 58
    • 79

    Mostly Sunny

    • 60
    • 79

    Chance Rain Showers

    • 56
    • 76

    Partly Sunny

    • 55
    • 74

    Partly Sunny

Today 18 Aug Winnebago

Mostly cloudy. A slight chance of Showers and Thunderstorms late in the morning. A chance of Showers and Thunderstorms in the afternoon. Highs in the upper 70s. Southwest Winds 10 to 15 Mph. Chance of precipitation 50 percent.

Tonight 18 Aug Winnebago

Mostly cloudy. A chance of Showers and Thunderstorms, mainly in the evening. Lows in the lower 60s. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sugar River Forest Preserve Temperature Statistics

August Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 3 August, 2026

    53.6 °F

  • Average August

    69.8 °F

  • Highest 4 August, 2026

    84.2 °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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