Janesville Weather Forecast

    • 47
    • 80

    Severe Tstms

    • 42
    • 63

    Partly Sunny

    • 50
    • 62

    Rain Showers Likely

    • 45
    • 68

    Chance Rain Showers

    • 42
    • 65

    Mostly Sunny

    • 51
    • 71

    Mostly Sunny

Today 28 Apr Bremer

Mostly cloudy. A chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may be severe. Windy with Highs in the upper 70s. South Winds 25 to 30 Mph with Gusts up to 45 Mph. Chance of rain 40 percent.

Tonight 28 Apr Bremer

Mostly cloudy in the Evening, then becoming partly cloudy. A chance of Showers and Thunderstorms. Some Thunderstorms may be severe. Windy with Lows in the upper 40s. South Winds 20 to 30 Mph with Gusts up to 45 Mph, becoming west 15 to 20 Mph with Gusts up to 30 Mph after midnight. Chance of rain 50 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Janesville Temperature Statistics

April Temperature

Waterloo, Waterloo Municipal Airport (6.8 miles)

  • Lowest 8 April, 2025

    16.8 °F

  • Average April

    49.6 °F

  • Highest 13 April, 2025

    76.6 °F

Climate (2020–Present)

Waterloo, Waterloo Municipal Airport (6.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    40.1 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    61.5 °F
Get WillyWeather+ to remove ads