Southern Wisconsin Regional Airport Weather Forecast

    • 33
    • 53

    Increasing Clouds

    • 22
    • 41

    Chance Rain/Snow

    • 29
    • 37

    Mostly Cloudy

    • 26
    • 50

    Mostly Cloudy

    • 16
    • 35

    Mostly Cloudy

    • 18
    • 30

    Mostly Cloudy

Today 30 Jan Rock

Sunny until late afternoon then becoming partly sunny. A 20 percent chance of light rain late in the afternoon. Highs in the lower 50s. Southwest Winds 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 30 Jan Rock

Mostly cloudy. Chance of light rain until early Morning, then light rain likely early in the morning. Lows in the mid 30s. South Winds up to 10 Mph shifting to the northeast after midnight. Chance of rain 60 percent.

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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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