South Beloit Weather Forecast

    • 54
    • 68

    Mostly Cloudy

    • 55
    • 74

    Chance Rain Showers

    • 54
    • 79

    Partly Sunny

    • 58
    • 85

    Mostly Sunny

    • 60
    • 87

    Partly Sunny

    • 58
    • 84

    Slight Chance Thunderstorms

    • 56
    • 81

    Partly Sunny

Today 22 May Winnebago

Mostly cloudy. Highs in the upper 60s. East Winds 10 to 15 Mph. Gusts up to 25 Mph in the afternoon.

Tonight 22 May Winnebago

Mostly cloudy. Lows in the mid 50s. East Winds 10 to 15 Mph, Diminishing to 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Beloit Temperature Statistics

May Temperature

Janesville-Rock County (8.7 miles)

  • Lowest 2 May, 2026

    30.2 °F

  • Average May

    53.9 °F

  • Highest 17 May, 2026

    84.2 °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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