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.

Partly Cloudy

54°F

12°C

Humidity 30%
Wind Speed SW 9 mph
Barometer 30.25 in
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 20 Apr 2:45 pm CDT
Extended Forecast for

Darien WI

  • Tonight

    Tonight: Mostly cloudy, with a low around 43. South wind around 10 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 72. West wind 10 to 15 mph.

    High: 72 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 45. West wind around 5 mph becoming northeast after midnight.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72. East wind 5 to 10 mph becoming southeast in the afternoon.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54. Southeast wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 77. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 77 °F

    Mostly Sunny
    then Partly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 59 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 70. South wind around 15 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 70 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 44.

    Low: 44 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 43. South wind around 10 mph.
Tuesday
Mostly sunny, with a high near 72. West wind 10 to 15 mph.
Tuesday Night
Mostly clear, with a low around 45. West wind around 5 mph becoming northeast after midnight.
Wednesday
Sunny, with a high near 72. East wind 5 to 10 mph becoming southeast in the afternoon.
Wednesday Night
Partly cloudy, with a low around 54. Southeast wind around 5 mph.
Thursday
Mostly sunny, with a high near 77. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 70. South wind around 15 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A 30 percent chance of showers before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 44.
Saturday
Mostly sunny, with a high near 63.
Saturday Night
Mostly cloudy, with a low around 43.
Sunday
Partly sunny, with a high near 61.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 43.
Monday
A 40 percent chance of showers. Mostly cloudy, with a high near 60.
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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:
2:36 pm CDT Apr 20, 2026
Forecast Valid:
3pm CDT Apr 20, 2026-6pm CDT Apr 27, 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