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.

Fair

43°F

6°C

Humidity 53%
Wind Speed E 3 mph
Barometer 30.21 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 24 Mar 9:15 pm CDT
Extended Forecast for

Darien WI

  • Tonight

    Tonight: Mostly cloudy, with a low around 34. Southeast wind around 5 mph.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 66. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 66 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 50. Southwest wind 5 to 10 mph.

    Low: 50 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of rain after 1pm. Partly sunny, with a high near 70. Southwest wind 5 to 15 mph becoming north in the afternoon.

    High: 70 °F

    Mostly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A slight chance of rain, mixing with snow after 10pm, then gradually ending. Mostly cloudy, with a low around 26. North wind 10 to 15 mph. Chance of precipitation is 20%.

    Low: 26 °F

    Slight Chance
    Rain/Snow

  • Friday

    Friday: Mostly sunny, with a high near 43. North wind around 10 mph.

    High: 43 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 24. West wind around 5 mph.

    Low: 24 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52. West wind 5 to 15 mph.

    High: 52 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 34. Southeast wind around 5 mph.
Wednesday
Partly sunny, with a high near 66. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Wednesday Night
Partly cloudy, with a low around 50. Southwest wind 5 to 10 mph.
Thursday
A 40 percent chance of rain after 1pm. Partly sunny, with a high near 70. Southwest wind 5 to 15 mph becoming north in the afternoon.
Thursday Night
A slight chance of rain, mixing with snow after 10pm, then gradually ending. Mostly cloudy, with a low around 26. North wind 10 to 15 mph. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 43. North wind around 10 mph.
Friday Night
Mostly clear, with a low around 24. West wind around 5 mph.
Saturday
Sunny, with a high near 52. West wind 5 to 15 mph.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Partly sunny, with a high near 58.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 65.
Monday Night
A 30 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 45.
Tuesday
A 30 percent chance of rain. Mostly cloudy, with a high near 62.
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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:
8:36 pm CDT Mar 24, 2026
Forecast Valid:
9pm CDT Mar 24, 2026-6pm CDT Mar 31, 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