South Beloit Weather Forecast

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    • 69

    Chance Rain Showers

    • 58
    • 75

    Chance Rain Showers

    • 61
    • 75

    Rain Showers

    • 59
    • 77

    Rain Showers

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    • 71

    Chance Rain Showers

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    • 70

    Chance Rain Showers

Today 16 Sep Winnebago

Mostly cloudy. A slight chance of Showers. Highs in the lower 70s. East Winds 5 to 10 Mph. Chance of precipitation 20 percent.

Tonight 16 Sep Winnebago

Mostly cloudy. A slight chance of Showers early in the Evening, then a chance of Showers with a slight chance of Thunderstorms in the late evening and overnight. Lows in the lower 60s. East Winds 5 to 10 Mph. Chance of precipitation 50 percent.

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South Beloit Temperature Statistics

September Temperature

Janesville-Rock County (8.7 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    68.3 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (8.7 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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