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

1°F

-17°C

Humidity 92%
Wind Speed Calm
Barometer 30.36 in
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Last update 1 Feb 1:35 am CST
Extended Forecast for

Darien WI

  • Overnight

    Overnight: Mostly clear, with a low around 2. Calm wind.

    Low: 2 °F

    Mostly Clear

  • Sunday

    Sunday: A 30 percent chance of snow after noon. Mostly sunny, with a high near 24. Wind chill values between -5 and 5. Light south wind increasing to 5 to 10 mph in the morning.

    High: 24 °F

    Mostly Sunny
    then Chance
    Snow

  • Sunday Night

    Sunday Night: Snow likely, mainly before midnight. Mostly cloudy, with a low around 14. South wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 14 °F

    Snow Likely
    then Chance
    Snow

  • Monday

    Monday: Mostly cloudy, with a high near 25. Northwest wind 5 to 10 mph.

    High: 25 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 7. Northwest wind around 5 mph becoming calm in the evening.

    Low: 7 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 21. North wind around 5 mph.

    High: 21 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 3. North wind around 5 mph becoming calm.

    Low: 3 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 21. Calm wind becoming northwest around 5 mph.

    High: 21 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 8.

    Low: 8 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 2. Calm wind.
Sunday
A 30 percent chance of snow after noon. Mostly sunny, with a high near 24. Wind chill values between -5 and 5. Light south wind increasing to 5 to 10 mph in the morning.
Sunday Night
Snow likely, mainly before midnight. Mostly cloudy, with a low around 14. South wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Monday
Mostly cloudy, with a high near 25. Northwest wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 7. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 21. North wind around 5 mph.
Tuesday Night
Partly cloudy, with a low around 3. North wind around 5 mph becoming calm.
Wednesday
Sunny, with a high near 21. Calm wind becoming northwest around 5 mph.
Wednesday Night
Partly cloudy, with a low around 8.
Thursday
A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 31.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 24.
Friday
A 20 percent chance of snow. Mostly cloudy, with a high near 32.
Friday Night
Mostly cloudy, with a low around 6.
Saturday
Partly sunny, with a high near 19.
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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:
1:31 am CST Feb 1, 2026
Forecast Valid:
1am CST Feb 1, 2026-6pm CST Feb 7, 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