South Beloit Weather Forecast

    • 45
    • 50

    Rain Showers Likely

    • 40
    • 59

    Partly Sunny

    • 41
    • 63

    Partly Sunny

    • 43
    • 65

    Chance Rain Showers

    • 43
    • 65

    Chance Rain Showers

    • 46
    • 64

    Chance Rain Showers

    • 46
    • 67

    Slight Chance Rain Showers

Today 21 May Winnebago

Cloudy. Areas of fog late in the morning. A chance of Showers. Nearly steady Temperatures in the upper 40s. North Winds around 10 Mph. Chance of precipitation 50 percent.

Tonight 21 May Winnebago

Cloudy. A chance of Showers through the early Overnight, then a slight chance of Showers late. Lows in the mid 40s. Northwest Winds 5 to 10 Mph. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Beloit Temperature Statistics

May Temperature

Janesville-Rock County (8.7 miles)

  • Lowest 9 May, 2025

    32 °F

  • Average May

    55.1 °F

  • Highest 15 May, 2025

    91.4 °F

Climate (2020–Present)

Janesville-Rock County (8.7 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    60.4 °F
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