South Beloit Weather Forecast

    • 49
    • 76

    Mostly Sunny

    • 61
    • 74

    Slight Chance Rain Showers

    • 63
    • 71

    Rain Showers

    • 51
    • 69

    Rain Showers

    • 46
    • 65

    Partly Sunny

    • 50
    • 65

    Slight Chance Rain Showers

    • 42
    • 64

    Mostly Sunny

Today 28 Sep Winnebago

Mostly sunny. Highs around 60.

Tonight 28 Sep Winnebago

Clear late in the Evening, then becoming partly cloudy. Lows in the upper 40s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Beloit Temperature Statistics

September Temperature

Janesville-Rock County (8.7 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    64.3 °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

    40.4 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.2 °F
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