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Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Light Rain

41°F

5°C

Humidity 87%
Wind Speed NE 7 mph
Barometer 29.98 in
Dewpoint 37°F (3°C)
Visibility 5.00 mi
Wind Chill36°F (2°C)
Last update 30 Apr 11:35 pm CDT
Extended Forecast for

Janesville WI

Frost Advisory May 1, 12:00am until May 1, 08:00am
Flood Warning April 30, 11:46pm until May 6, 07:00pm
Click here for hazard details and duration
Frost Advisory
Flood Warning
  •  
    Flood Warning April 30, 11:46pm until May 6, 07:00pm

    NOW until 7:00pm Wed

    Flood Warning

  • Tonight

    Low: 35 °F

    Showers
    Likely

  • Friday

    Friday: Isolated showers after 1pm. Patchy frost before 8am. Otherwise, partly sunny, with a high near 52. North wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 52 °F

    Patchy Frost
    then Isolated
    Showers

  • Friday Night

    Friday Night: Widespread frost, mainly after 4am. Otherwise, partly cloudy, with a low around 33. North wind around 5 mph becoming calm in the evening.

    Low: 33 °F

    Mostly Cloudy
    then Frost

  • Saturday

    Saturday: Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 55. Calm wind becoming north around 5 mph in the morning.

    High: 55 °F

    Frost then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 41. Southwest wind around 5 mph.

    Low: 41 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 64. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 64 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 45. Southwest wind 5 to 10 mph. Chance of precipitation is 10%.

    Low: 45 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 73. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 73 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Tonight
Showers likely, mainly before 1am. Patchy frost after 5am. Otherwise, mostly cloudy, with a low around 35. Southeast wind around 5 mph becoming calm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Isolated showers after 1pm. Patchy frost before 8am. Otherwise, partly sunny, with a high near 52. North wind 5 to 10 mph. Chance of precipitation is 20%.
Friday Night
Widespread frost, mainly after 4am. Otherwise, partly cloudy, with a low around 33. North wind around 5 mph becoming calm in the evening.
Saturday
Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 55. Calm wind becoming north around 5 mph in the morning.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 41. Southwest wind around 5 mph.
Sunday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 64. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Sunday Night
A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 45. Southwest wind 5 to 10 mph. Chance of precipitation is 10%.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 73. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 45. Chance of precipitation is 30%.
Tuesday
A 40 percent chance of showers, mainly after 1pm. Partly sunny, with a high near 62.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 41.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 57.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 39.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 59.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.67°N 89.04°W (Elev. 774 ft)
Last Update:
11:41 pm CDT Apr 30, 2026
Forecast Valid:
11pm CDT Apr 30, 2026-6pm CDT May 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation