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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 42.69°N 89.03°W (Text-Only)
NWS Forecast for: Janesville WI
Issued by: National Weather Service Milwaukee, WI
Last Update: 4:52 am CDT Jun 30, 2026		Print

  • Today

    Today: Mostly sunny and hot, with a high near 93. Heat index values as high as 105. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Hot



  • Tonight

    Tonight: Mostly clear, with a low around 75. Southwest wind 10 to 15 mph.

    Low: 75 °F

    Mostly Clear



  • Wednesday

    Wednesday: Sunny and hot, with a high near 93. Heat index values as high as 103. Southwest wind 10 to 15 mph.

    High: 93 °F

    Hot



  • Wednesday
    Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 75. Southwest wind 10 to 15 mph.

    Low: 75 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 91. Southwest wind around 10 mph.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday
    Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 88. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Showers
    Likely


  • Friday
    Night

    Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Showers
    Likely


  • Independence
    Day

    Independence Day: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms



    • Today: Mostly sunny and hot, with a high near 93. Heat index values as high as 105. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Tonight: Mostly clear, with a low around 75. Southwest wind 10 to 15 mph.

    Wednesday: Sunny and hot, with a high near 93. Heat index values as high as 103. Southwest wind 10 to 15 mph.

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 75. Southwest wind 10 to 15 mph.

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 91. Southwest wind around 10 mph.

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Friday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 88. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Independence Day: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.

    Saturday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.

    Sunday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.

    Sunday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.

    Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.


    Janesville WI
     42.69°N 89.03°W (Elev. 860 ft)

    Visit your local NWS office at: https://www.weather.gov/mkx