South Beloit Weather Forecast

    • 46
    • 68

    Chance Rain Showers

    • 64
    • 73

    Rain Showers Likely

    • 55
    • 78

    Rain Showers

    • 60
    • 70

    Rain Showers Likely

    • 59
    • 76

    Chance Rain Showers

    • 56
    • 74

    Chance Rain Showers

Today 13 Sep Winnebago

Partly cloudy in the Morning, then becoming mostly cloudy. Isolated Showers late in the morning. Scattered Showers early in the afternoon. Highs in the upper 60s. North Winds 5 to 10 Mph. Chance of precipitation 40 percent.

Tonight 13 Sep Winnebago

Mostly clear. Lows in the upper 40s. Northwest Winds around 5 Mph, becoming northeast after midnight.

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South Beloit Temperature Statistics

September Temperature

Janesville-Rock County (8.7 miles)

  • Lowest 7 September, 2026

    55.4 °F

  • Average September

    71.4 °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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