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

84°F

29°C

Humidity 37%
Wind Speed NE 8 mph
Barometer 30.02 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 29 Jul 3:45 pm CDT
Extended Forecast for

Roscoe IL

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, clear, with a low around 61. Northeast wind around 5 mph becoming calm.

    Low: 61 °F

    Clear then
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 87 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 61. South southwest wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Mostly Cloudy

  • Friday

    Friday: Showers likely, then showers and possibly a thunderstorm after 1pm. High near 76. South wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 80%.

    High: 76 °F

    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 59. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 59 °F

    Showers

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Chance of precipitation is 60%.

    High: 78 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, clear, with a low around 61. Northeast wind around 5 mph becoming calm.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 61. South southwest wind around 5 mph becoming calm in the evening.
Friday
Showers likely, then showers and possibly a thunderstorm after 1pm. High near 76. South wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 80%.
Friday Night
Showers and possibly a thunderstorm. Low around 59. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday
Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 58.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 55.
Monday
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 59.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
A chance of showers. Mostly sunny, with a high near 85.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Roscoe IL
 42.41°N 89.02°W
Last Update:
2:26 pm CDT Jul 29, 2026
Forecast Valid:
4pm CDT Jul 29, 2026-6pm CDT Aug 5, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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