South Beloit Weather Forecast

    • 55
    • 84

    Partly Sunny

    • 52
    • 74

    Mostly Cloudy

    • 53
    • 78

    Mostly Cloudy

    • 53
    • 81

    Partly Sunny

    • 53
    • 81

    Mostly Sunny

    • 58
    • 84

    Partly Sunny

Today 29 May Winnebago

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the mid 80s. South Winds around 5 Mph, becoming west in the afternoon.

Tonight 29 May Winnebago

Partly cloudy. Lows in the mid 50s. East Winds 5 to 10 Mph.

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South Beloit Temperature Statistics

May Temperature

Janesville-Rock County (8.7 miles)

  • Lowest 2 May, 2026

    30.2 °F

  • Average May

    56 °F

  • Highest 26 May, 2026

    87.8 °F

Climate (2021–Present)

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

    60.4 °F
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