South Beloit Weather Forecast

    • 60
    • 70

    Rain Showers

    • 54
    • 67

    Chance Thunderstorms

    • 48
    • 62

    Chance Rain Showers

    • 47
    • 61

    Partly Sunny

    • 49
    • 64

    Partly Sunny

    • 50
    • 66

    Mostly Cloudy

Today 19 Sep Winnebago

A chance of Thunderstorms late in the morning. Showers. A chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall late in the morning. Highs in the mid 70s. South Winds 5 to 10 Mph. Chance of precipitation near 100 percent.

Tonight 19 Sep Winnebago

Showers with Thunderstorms likely until early Morning, then a chance of Showers and Thunderstorms late. Lows around 60. East Winds around 5 Mph, increasing to northeast 10 to 15 Mph after midnight. Chance of precipitation 90 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

    67.5 °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

    40.4 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.2 °F
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