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 67%
Wind Speed NW 3 mph
Barometer 29.96 in
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Last update 1 Jan 1:45 pm CST
Extended Forecast for

2 Miles W Darien WI

  • New Year's Day

    New Year's Day: A 30 percent chance of snow, mainly before 3pm. Cloudy, with a high near 18. West wind around 5 mph.

    High: 18 °F

    Chance Snow

  • Tonight

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

    Low: 8 °F

    Decreasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 21. Northwest wind 5 to 10 mph.

    High: 21 °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. Calm wind.

    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 30 percent chance of snow, mainly before 3pm. 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 becoming calm.
Friday
Mostly sunny, with a high near 21. 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. Calm wind.
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.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W Darien WI
 42.59°N 88.75°W (Elev. 889 ft)
Last Update:
1:52 pm CST Jan 1, 2026
Forecast Valid:
2pm CST Jan 1, 2026-6pm CST Jan 7, 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

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Chance of Precipitation