National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

50°F

10°C

Humidity 54%
Wind Speed SW 14 mph
Barometer 29.69 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 9 Mar 2:15 am CDT
Extended Forecast for

Janesville WI

  • Overnight

    Overnight: Mostly clear, with a low around 45. Southwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 67. Southwest wind around 10 mph.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 43. South wind around 5 mph becoming calm in the evening.

    Low: 43 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 63. Northeast wind 5 to 10 mph. Chance of precipitation is 30%.

    High: 63 °F

    Mostly Sunny
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then rain and possibly a thunderstorm between 1am and 4am, then rain after 4am. Low around 34. Northeast wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 34 °F

    Showers

  • Wednesday

    Wednesday: Rain likely before 10am, then rain and snow likely between 10am and 4pm, then a chance of snow after 4pm. Cloudy, with a high near 41. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    High: 41 °F

    Rain/Snow
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 25. Northwest wind 5 to 10 mph.

    Low: 25 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Increasing clouds, with a high near 46. West wind 5 to 10 mph becoming south 10 to 15 mph in the afternoon.

    High: 46 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Rain likely before 1am, then rain and snow. Low around 35. Breezy. Chance of precipitation is 80%.

    Low: 35 °F

    Breezy. Rain
    Likely then
    Rain/Snow

Detailed Forecast

Overnight
Mostly clear, with a low around 45. Southwest wind around 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 67. Southwest wind around 10 mph.
Monday Night
Mostly clear, with a low around 43. South wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 63. Northeast wind 5 to 10 mph. Chance of precipitation is 30%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then rain and possibly a thunderstorm between 1am and 4am, then rain after 4am. Low around 34. Northeast wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Rain likely before 10am, then rain and snow likely between 10am and 4pm, then a chance of snow after 4pm. Cloudy, with a high near 41. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 25. Northwest wind 5 to 10 mph.
Thursday
Increasing clouds, with a high near 46. West wind 5 to 10 mph becoming south 10 to 15 mph in the afternoon.
Thursday Night
Rain likely before 1am, then rain and snow. Low around 35. Breezy. Chance of precipitation is 80%.
Friday
A slight chance of rain and snow before 1pm. Mostly sunny, with a high near 45. Breezy. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 27.
Saturday
A chance of rain and snow. Cloudy, with a high near 44. Chance of precipitation is 40%.
Saturday Night
Rain and snow likely. Cloudy, with a low around 32. Chance of precipitation is 60%.
Sunday
Rain and snow likely. Cloudy, with a high near 44. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.67°N 89.04°W (Elev. 774 ft)
Last Update:
1:22 am CDT Mar 9, 2026
Forecast Valid:
2am CDT Mar 9, 2026-6pm CDT Mar 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation