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

36°F

2°C

Humidity 100%
Wind Speed Calm
Barometer 30.15 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 9 Jan 5:45 pm CST
Extended Forecast for

Roscoe IL

  • Tonight

    Tonight: Rain and snow likely after 2am, becoming all snow after 4am. Increasing clouds, with a low around 31. Calm wind becoming south southeast around 5 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 31 °F

    Partly Cloudy
    then
    Rain/Snow
    Likely

  • Saturday

    Saturday: Snow, mainly before noon, then a chance of snow showers after noon. High near 33. West northwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    High: 33 °F

    Snow then
    Chance Snow
    Showers

  • Saturday Night

    Saturday Night: Scattered snow showers, mainly before midnight. Mostly cloudy, with a low around 19. West northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    Low: 19 °F

    Scattered
    Snow Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 30. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 30 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Monday Night

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

    Low: 30 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain. Mostly cloudy, with a high near 44.

    High: 44 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain and snow after midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

Detailed Forecast

Tonight
Rain and snow likely after 2am, becoming all snow after 4am. Increasing clouds, with a low around 31. Calm wind becoming south southeast around 5 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.
Saturday
Snow, mainly before noon, then a chance of snow showers after noon. High near 33. West northwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Saturday Night
Scattered snow showers, mainly before midnight. Mostly cloudy, with a low around 19. West northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Sunday
Mostly sunny, with a high near 30. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday Night
Partly cloudy, with a low around 22. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 40.
Monday Night
Mostly cloudy, with a low around 30.
Tuesday
A chance of rain. Mostly cloudy, with a high near 44.
Tuesday Night
A chance of rain and snow after midnight. Mostly cloudy, with a low around 27.
Wednesday
A chance of snow. Mostly cloudy, with a high near 30.
Wednesday Night
Mostly cloudy, with a low around 15.
Thursday
Mostly sunny, with a high near 28.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 20.
Friday
A chance of snow. Mostly cloudy, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Roscoe IL
 42.43°N 89.02°W
Last Update:
6:01 pm CST Jan 9, 2026
Forecast Valid:
6pm CST Jan 9, 2026-6pm CST Jan 16, 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