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.

Fog/Mist

63°F

17°C

Humidity 100%
Wind Speed Calm
Barometer 30.05 in
Dewpoint 63°F (17°C)
Visibility 7.00 mi
Last update 15 Jul 5:45 am CDT
Extended Forecast for

Darien WI

  • Today

    Today: Mostly sunny, with a high near 87. Calm wind becoming south around 5 mph in the morning.

    High: 87 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 68. South wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 87. Heat index values as high as 96. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Mostly Sunny
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 62. Southwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 62 °F

    Showers
    Likely

  • Thursday

    Thursday: A slight chance of showers before 7am, then a slight chance of showers and thunderstorms between 7am and 10am, then a slight chance of showers after 10am. Mostly cloudy, with a high near 71. North wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 71 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 54. Northeast wind 5 to 10 mph.

    Low: 54 °F

    Decreasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 75. Northeast wind around 5 mph becoming east in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 59. East wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 50%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 87. Calm wind becoming south around 5 mph in the morning.
Tonight
Partly cloudy, with a low around 68. South wind around 5 mph becoming calm in the evening.
Wednesday
Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 87. Heat index values as high as 96. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 62. Southwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
A slight chance of showers before 7am, then a slight chance of showers and thunderstorms between 7am and 10am, then a slight chance of showers after 10am. Mostly cloudy, with a high near 71. North wind 5 to 10 mph. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 54. Northeast wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 75. Northeast wind around 5 mph becoming east in the afternoon.
Friday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 59. East wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Darien WI
 42.59°N 88.72°W (Elev. 945 ft)
Last Update:
5:38 am CDT Jul 15, 2025
Forecast Valid:
6am CDT Jul 15, 2025-6pm CDT Jul 21, 2025
 
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