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.

Mostly Cloudy

54°F

12°C

Humidity 72%
Wind Speed S 16 mph
Barometer 29.81 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 3 May 10:45 am CDT
Extended Forecast for

Darien WI

  • Today

    Today: A 40 percent chance of showers before noon. Mostly sunny, with a high near 68. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 68 °F

    Chance
    Showers and
    Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 44. West wind 5 to 10 mph.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 75. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 75 °F

    Sunny then
    Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: Showers and thunderstorms likely. Increasing clouds, with a low around 44. Southwest wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 44 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 53. North wind 5 to 10 mph.

    High: 53 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Areas of frost after 5am. Otherwise, mostly cloudy, with a low around 36. Northwest wind 5 to 10 mph.

    Low: 36 °F

    Mostly Cloudy
    then Areas
    Frost

  • Wednesday

    Wednesday: Areas of frost before 7am. Otherwise, partly sunny, with a high near 55. Northwest wind 5 to 10 mph.

    High: 55 °F

    Areas Frost
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37. Northwest wind around 5 mph becoming calm in the evening.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 56. Chance of precipitation is 40%.

    High: 56 °F

    Chance
    Showers

Detailed Forecast

Today
A 40 percent chance of showers before noon. Mostly sunny, with a high near 68. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.
Tonight
Mostly clear, with a low around 44. West wind 5 to 10 mph.
Monday
A 30 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 75. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Monday Night
Showers and thunderstorms likely. Increasing clouds, with a low around 44. Southwest wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 53. North wind 5 to 10 mph.
Tuesday Night
Areas of frost after 5am. Otherwise, mostly cloudy, with a low around 36. Northwest wind 5 to 10 mph.
Wednesday
Areas of frost before 7am. Otherwise, partly sunny, with a high near 55. Northwest wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 37. Northwest wind around 5 mph becoming calm in the evening.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 56. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 36.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 60.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 40.
Saturday
Mostly sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Darien WI
 42.59°N 88.72°W (Elev. 945 ft)
Last Update:
10:33 am CDT May 3, 2026
Forecast Valid:
11am CDT May 3, 2026-6pm CDT May 9, 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