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.

Fair

81°F

27°C

Humidity 39%
Wind Speed S 16 G 24 mph
Barometer 29.78 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 15 May 4:45 pm CDT
Extended Forecast for

5 Miles SSW Janesville WI

  • Tonight

    Tonight: Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then a chance of showers and thunderstorms after 4am. Low around 59. South wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 59 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: A 10 percent chance of showers before 7am. Mostly sunny, with a high near 84. West wind 5 to 10 mph.

    High: 84 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 57. Calm wind becoming southeast around 5 mph after midnight.

    Low: 57 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 84. Breezy, with an east wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    High: 84 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 64 °F

    Mostly Clear
    and Breezy
    then Partly
    Cloudy

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 84 °F

    Showers
    Likely and
    Breezy

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 62 °F

    Showers
    Likely and
    Breezy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 75. Breezy, with a southwest wind around 20 mph, with gusts as high as 30 mph.

    High: 75 °F

    Chance
    Showers and
    Breezy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then a chance of showers and thunderstorms after 4am. Low around 59. South wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A 10 percent chance of showers before 7am. Mostly sunny, with a high near 84. West wind 5 to 10 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 57. Calm wind becoming southeast around 5 mph after midnight.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 84. Breezy, with an east wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Sunday Night
Mostly clear, with a low around 64. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 75. Breezy, with a southwest wind around 20 mph, with gusts as high as 30 mph.
Tuesday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 48.
Wednesday
Mostly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Mostly sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 72.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW Janesville WI
 42.63°N 89.04°W (Elev. 804 ft)
Last Update:
3:32 pm CDT May 15, 2026
Forecast Valid:
5pm CDT May 15, 2026-6pm CDT May 22, 2026
 
Forecast Discussion
 
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Additional Resources

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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