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

55°F

13°C

Humidity 94%
Wind Speed Calm
Barometer 30.08 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 24 Aug 7:45 am CDT
Extended Forecast for

Roscoe IL

  • Today

    Today: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 78. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 78 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 55. North northeast wind around 5 mph becoming calm.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. South wind around 5 mph, with gusts as high as 10 mph.

    Low: 61 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 82. West wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 78. Calm wind becoming north northwest around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 55. North northeast wind around 5 mph becoming calm.
Tuesday
Mostly sunny, with a high near 79. Light south wind becoming south southwest 5 to 10 mph in the morning.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. South wind around 5 mph, with gusts as high as 10 mph.
Wednesday
A slight chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 82. West wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 56.
Friday
Sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 58.
Saturday
Partly sunny, with a high near 80.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Sunday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Roscoe IL
 42.43°N 88.99°W
Last Update:
6:16 am CDT Aug 24, 2026
Forecast Valid:
8am CDT Aug 24, 2026-6pm CDT Aug 30, 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