National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Overcast

16°F

-9°C

Humidity 62%
Wind Speed Vrbl 5 mph
Barometer 29.95 in
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 1 Jan 2:45 pm CST
Extended Forecast for

Darien WI

  • New Year's Day

    New Year's Day: A 20 percent chance of snow before 4pm. Mostly cloudy, with a high near 18. West wind around 5 mph.

    High: 18 °F

    Slight Chance
    Snow

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 8. West wind around 5 mph.

    Low: 8 °F

    Decreasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 20. Northwest wind 5 to 10 mph.

    High: 20 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 13. Calm wind.

    Low: 13 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 25. Calm wind becoming west around 5 mph.

    High: 25 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 9. West wind around 5 mph becoming calm.

    Low: 9 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 27. Calm wind becoming south around 5 mph in the afternoon.

    High: 27 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 22. South wind 5 to 10 mph.

    Low: 22 °F

    Chance Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

Detailed Forecast

New Year's Day
A 20 percent chance of snow before 4pm. Mostly cloudy, with a high near 18. West wind around 5 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 8. West wind around 5 mph.
Friday
Mostly sunny, with a high near 20. Northwest wind 5 to 10 mph.
Friday Night
Mostly cloudy, with a low around 13. Calm wind.
Saturday
Mostly cloudy, with a high near 25. Calm wind becoming west around 5 mph.
Saturday Night
Partly cloudy, with a low around 9. West wind around 5 mph becoming calm.
Sunday
Increasing clouds, with a high near 27. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
A 30 percent chance of snow before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 22. South wind 5 to 10 mph.
Monday
Partly sunny, with a high near 39.
Monday Night
Mostly cloudy, with a low around 30.
Tuesday
Mostly cloudy, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 25.
Wednesday
Mostly sunny, with a high near 40.
Wednesday Night
Partly cloudy, with a low around 29.
Thursday
A 20 percent chance of rain. Partly sunny, with a high near 42.
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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:
1:52 pm CST Jan 1, 2026
Forecast Valid:
3pm CST Jan 1, 2026-6pm CST Jan 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation