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 Vrbl 5 mph
Barometer 29.94 in
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 1 Jan 3:45 pm CST
Extended Forecast for

5 Miles SSW Janesville WI

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 9. Calm wind becoming northwest around 5 mph after midnight.

    Low: 9 °F

    Decreasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 22. Wind chill values between zero and 10. Northwest wind 5 to 10 mph.

    High: 22 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 14. Calm wind.

    Low: 14 °F

    Mostly Cloudy

  • Saturday

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

    High: 25 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 10. West wind around 5 mph becoming calm in the evening.

    Low: 10 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 27. Light and variable wind becoming south 5 to 10 mph in the afternoon.

    High: 27 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 23. South wind around 10 mph.

    Low: 23 °F

    Slight Chance
    Snow then
    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 40. Southwest wind 5 to 10 mph.

    High: 40 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 9. Calm wind becoming northwest around 5 mph after midnight.
Friday
Mostly sunny, with a high near 22. Wind chill values between zero and 10. Northwest wind 5 to 10 mph.
Friday Night
Mostly cloudy, with a low around 14. Calm wind.
Saturday
Mostly cloudy, with a high near 25. Calm wind becoming west around 5 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 10. West wind around 5 mph becoming calm in the evening.
Sunday
Increasing clouds, with a high near 27. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Sunday Night
A 20 percent chance of snow before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 23. South wind around 10 mph.
Monday
Partly sunny, with a high near 40. Southwest wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 30.
Tuesday
Mostly cloudy, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 25.
Wednesday
Mostly sunny, with a high near 41.
Wednesday Night
Partly cloudy, with a low around 29.
Thursday
A 20 percent chance of rain. Partly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW Janesville WI
 42.63°N 89.04°W (Elev. 804 ft)
Last Update:
3:13 pm CST Jan 1, 2026
Forecast Valid:
4pm CST Jan 1, 2026-6pm CST Jan 8, 2026
 
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Additional Resources

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Chance of Precipitation