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

64°F

18°C

Humidity 88%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 26 Aug 10:15 pm CDT
Extended Forecast for

Darien WI

  • Tonight

    Tonight: Mostly clear, with a low around 59. Northwest wind around 5 mph becoming calm.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 79. Northwest wind 5 to 10 mph.

    High: 79 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. North wind around 5 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59. Calm wind becoming south around 5 mph.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 79. South wind 5 to 10 mph.

    High: 79 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 64. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    Low: 64 °F

    Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 84. Southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 84 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 59. Northwest wind around 5 mph becoming calm.
Thursday
Mostly sunny, with a high near 79. Northwest wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 56. North wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 59. Calm wind becoming south around 5 mph.
Saturday
Partly sunny, with a high near 79. South wind 5 to 10 mph.
Saturday Night
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 64. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Sunday
A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 84. Southwest wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Monday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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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:
10:16 pm CDT Aug 26, 2026
Forecast Valid:
10pm CDT Aug 26, 2026-6pm CDT Sep 2, 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