Janesville Weather Forecast

    • 56
    • 78

    Partly Sunny

    • 59
    • 78

    Partly Sunny

    • 63
    • 81

    Mostly Sunny

    • 67
    • 83

    Slight Chance Thunderstorms

    • 69
    • 87

    Chance Thunderstorms

    • 70
    • 89

    Chance Thunderstorms

    • 68
    • 88

    Slight Chance Thunderstorms

Today 3 Aug Bremer

Mostly sunny. Near steady temperature in the mid 70s. South Winds 5 to 10 Mph.

Tonight 3 Aug Bremer

Partly cloudy. Lows in the mid 50s. Southeast Winds 5 to 10 Mph.

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Janesville Temperature Statistics

August Temperature

Waterloo, Waterloo Municipal Airport (6.8 miles)

  • Lowest 1 August, 2025

    54 °F

  • Average August

    65 °F

  • Highest 1 August, 2025

    75.9 °F

Climate (2020–Present)

Waterloo, Waterloo Municipal Airport (6.8 miles)

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  • Average Low 2020–2025

    40 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    61.5 °F
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