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

14°F

-10°C

Humidity 67%
Wind Speed W 6 mph
Barometer 30.03 in
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill5°F (-15°C)
Last update 1 Jan 10:45 am CST
Extended Forecast for

5 Miles SW Fort Atkinson WI

  • New Year's Day

    New Year's Day: Snow, mainly before 4pm. High near 18. West wind around 5 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.

    High: 18 °F

    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: Sunny, with a high near 21. Northwest wind around 5 mph.

    High: 21 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 12. Northwest wind around 5 mph becoming calm.

    Low: 12 °F

    Mostly Cloudy

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 25. Calm wind becoming west around 5 mph.

    High: 25 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 8. West wind around 5 mph becoming calm.

    Low: 8 °F

    Mostly Clear

  • 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, mainly before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 21. South wind 5 to 10 mph.

    Low: 21 °F

    Chance Snow

  • Monday

    Monday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

Detailed Forecast

New Year's Day
Snow, mainly before 4pm. High near 18. West wind around 5 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 8. West wind around 5 mph.
Friday
Sunny, with a high near 21. Northwest wind around 5 mph.
Friday Night
Mostly cloudy, with a low around 12. Northwest wind around 5 mph becoming calm.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 25. Calm wind becoming west around 5 mph.
Saturday Night
Mostly clear, with a low around 8. 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, mainly before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 21. South wind 5 to 10 mph.
Monday
Partly sunny, with a high near 37.
Monday Night
Mostly cloudy, with a low around 26.
Tuesday
Mostly cloudy, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 27.
Wednesday
Partly sunny, with a high near 37.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW Fort Atkinson WI
 42.88°N 88.9°W (Elev. 814 ft)
Last Update:
10:08 am CST Jan 1, 2026
Forecast Valid:
11am CST Jan 1, 2026-6pm CST Jan 7, 2026
 
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Additional Resources

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Chance of Precipitation