Southern Wisconsin Regional Airport Weather Forecast

    • 25
    • 43

    Mostly Sunny

    • 34
    • 53

    Rain Likely

    • 22
    • 41

    Chance Rain/Snow

    • 30
    • 38

    Slight Chance Snow

    • 24
    • 48

    Mostly Cloudy

    • 17
    • 34

    Mostly Cloudy

Today 29 Jan Rock

Mostly sunny. Highs in the lower 40s. Northwest Winds 10 to 15 Mph.

Tonight 29 Jan Rock

Mostly clear. Lows in the upper 20s. West Winds up to 5 Mph shifting to the south after midnight.

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Southern Wisconsin Regional Airport Temperature Statistics

January Temperature

Janesville-Rock County (0 miles)

  • Lowest 21 January, 2025

    -13 °F

  • Average January

    16.5 °F

  • Highest 17 January, 2025

    53.6 °F

Climate (2020–Present)

Janesville-Rock County (0 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    60.2 °F
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