South Beloit Weather Forecast

    • 58
    • 85

    Chance Thunderstorms

    • 65
    • 84

    Rain Showers Likely

    • 63
    • 82

    Rain Showers

    • 48
    • 80

    Rain Showers Likely

    • 41
    • 64

    Partly Sunny

    • 44
    • 66

    Partly Sunny

Today 16 May Winnebago

Mostly sunny early in the Afternoon, then becoming partly cloudy. A slight chance of Showers and Thunderstorms late. Highs in the mid 80s. West Winds 5 to 10 Mph. Chance of precipitation 20 percent.

Tonight 16 May Winnebago

Mostly cloudy. A chance of Showers until early morning. A chance of Thunderstorms. Showers likely late. Lows in the upper 50s. Southeast Winds around 5 Mph. Chance of precipitation 70 percent.

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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

    48.9 °F

  • Highest 4 May, 2026

    80.6 °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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