Janesville Weather Forecast

    • 59
    • 81

    Increasing Clouds

    • 51
    • 74

    Rain Showers

    • 43
    • 64

    Slight Chance Rain Showers

    • 47
    • 65

    Mostly Cloudy

    • 51
    • 68

    Rain Showers Likely

    • 43
    • 64

    Rain Showers Likely

    • 41
    • 60

    Partly Sunny

Today 22 Apr Bremer

Mostly sunny. Near steady temperature in the upper 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 22 Apr Bremer

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the upper 50s. South Winds around 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Janesville Temperature Statistics

April Temperature

Waterloo, Waterloo Municipal Airport (6.8 miles)

  • Lowest 7 April, 2026

    23.6 °F

  • Average April

    50.2 °F

  • Highest 17 April, 2026

    82.7 °F

Climate (2021–Present)

Waterloo, Waterloo Municipal Airport (6.8 miles)

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  • Average Low 2021–2026

    40.2 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    61.9 °F
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