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

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Overcast

77°F

25°C

Humidity 61%
Wind Speed S 7 mph
Barometer 29.82 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 17 May 11:15 pm CDT
Extended Forecast for

Janesville WI

  • Overnight

    Overnight: A chance of showers and thunderstorms between 3am and 4am, then showers likely and possibly a thunderstorm after 4am. Partly cloudy, with a low around 68. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely and possibly a thunderstorm before 9am, then a chance of showers and thunderstorms, mainly between 9am and 1pm. Mostly cloudy, with a high near 81. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Showers
    Likely then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 64. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Chance
    T-storms then
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm before 7am, then a chance of showers and thunderstorms between 7am and 1pm. High near 75. Breezy, with a southwest wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Showers and
    Breezy then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 46. Northwest wind 5 to 15 mph.

    Low: 46 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 61. North wind 5 to 10 mph.

    High: 61 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 39. Northeast wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 64. East wind 5 to 10 mph.

    High: 64 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Overnight
A chance of showers and thunderstorms between 3am and 4am, then showers likely and possibly a thunderstorm after 4am. Partly cloudy, with a low around 68. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
Showers likely and possibly a thunderstorm before 9am, then a chance of showers and thunderstorms, mainly between 9am and 1pm. Mostly cloudy, with a high near 81. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 64. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers and possibly a thunderstorm before 7am, then a chance of showers and thunderstorms between 7am and 1pm. High near 75. Breezy, with a southwest wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Partly cloudy, with a low around 46. Northwest wind 5 to 15 mph.
Wednesday
Mostly sunny, with a high near 61. North wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 39. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 64. East wind 5 to 10 mph.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 45.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 69.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 49.
Saturday
Partly sunny, with a high near 75.
Saturday Night
Partly cloudy, with a low around 53.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
Last Update:
11:31 pm CDT May 17, 2026
Forecast Valid:
12am CDT May 18, 2026-6pm CDT May 24, 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