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

19°F

-7°C

Humidity 73%
Wind Speed NW 6 mph
Barometer 29.87 in
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 25 Feb 10:35 pm CST
Extended Forecast for

Darien WI

  • Tonight

    Tonight: Partly cloudy, with a low around 15. Calm wind.

    Low: 15 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 40. Light south wind becoming southwest 5 to 10 mph in the morning.

    High: 40 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 28. Southwest wind around 5 mph.

    Low: 28 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 58. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 58 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Friday Night

    Friday Night: Increasing clouds, with a low around 25. West wind 5 to 10 mph becoming northwest after midnight.

    Low: 25 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 50 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 32. North wind 5 to 10 mph.

    High: 32 °F

    Slight Chance
    Snow then
    Chance Snow

  • Saturday Night

    Saturday Night: A 20 percent chance of snow before midnight. Cloudy during the early evening, then gradual clearing, with a low around 14. North wind 5 to 10 mph.

    Low: 14 °F

    Slight Chance
    Snow then
    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of snow after noon. Sunny through mid morning, then becoming mostly cloudy, with a high near 28. Northeast wind 5 to 10 mph.

    High: 28 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: A 30 percent chance of snow, mainly before midnight. Cloudy during the early evening, then gradual clearing, with a low around 16.

    Low: 16 °F

    Chance Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 15. Calm wind.
Thursday
Partly sunny, with a high near 40. Light south wind becoming southwest 5 to 10 mph in the morning.
Thursday Night
Mostly clear, with a low around 28. Southwest wind around 5 mph.
Friday
Sunny, with a high near 58. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Friday Night
Increasing clouds, with a low around 25. West wind 5 to 10 mph becoming northwest after midnight.
Saturday
A 50 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 32. North wind 5 to 10 mph.
Saturday Night
A 20 percent chance of snow before midnight. Cloudy during the early evening, then gradual clearing, with a low around 14. North wind 5 to 10 mph.
Sunday
A 20 percent chance of snow after noon. Sunny through mid morning, then becoming mostly cloudy, with a high near 28. Northeast wind 5 to 10 mph.
Sunday Night
A 30 percent chance of snow, mainly before midnight. Cloudy during the early evening, then gradual clearing, with a low around 16.
Monday
Mostly sunny, with a high near 34.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 20.
Tuesday
A 30 percent chance of snow. Mostly sunny, with a high near 39.
Tuesday Night
A 20 percent chance of snow. Mostly clear, with a low around 23.
Wednesday
Sunny, with a high near 46.
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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:
8:33 pm CST Feb 25, 2026
Forecast Valid:
10pm CST Feb 25, 2026-6pm CST Mar 4, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation