Janesville Weather Forecast

    • 26
    • 47

    Mostly Sunny

    • 32
    • 41

    Mostly Cloudy

    • 23
    • 54

    Mostly Cloudy

    • 14
    • 33

    Mostly Cloudy

    • 19
    • 29

    Mostly Cloudy

    • 14
    • 32

    Slight Chance Snow

Today 31 Jan Bremer

Mostly sunny. Highs in the mid 40s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 31 Jan Bremer

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 20s. Northeast Winds 5 to 10 Mph, becoming east with Gusts up to 20 Mph after midnight.

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  • Temperature Real-Time

Janesville Temperature Statistics

January Temperature

Waterloo, Waterloo Municipal Airport (6.8 miles)

  • Lowest 21 January, 2025

    -13.3 °F

  • Average January

    18.6 °F

  • Highest 28 January, 2025

    55.9 °F

Climate (2020–Present)

Waterloo, Waterloo Municipal Airport (6.8 miles)

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  • Average Low 2020–2025

    40.1 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    61.3 °F
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