National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Light Rain

66°F

19°C

Humidity 94%
Wind Speed NE 13 mph
Barometer 30.05 in
Dewpoint 64°F (18°C)
Visibility 3.00 mi
Last update 20 Sep 12:45 pm CDT
Extended Forecast for

Roscoe IL

  • This Afternoon

    This Afternoon: Showers likely, mainly before 2pm. Cloudy, with a high near 64. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 64 °F

    Showers
    Likely

  • Tonight

    Tonight: Cloudy, with a low around 54. East northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 54 °F

    Cloudy

  • Monday

    Monday: A 30 percent chance of showers, mainly between 10am and 1pm. Cloudy, with a high near 63. Breezy, with an east northeast wind 15 to 20 mph, with gusts as high as 25 mph.

    High: 63 °F

    Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 49. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 49 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 61. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers likely, mainly before 2pm. Cloudy, with a high near 64. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Cloudy, with a low around 54. East northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
A 30 percent chance of showers, mainly between 10am and 1pm. Cloudy, with a high near 63. Breezy, with an east northeast wind 15 to 20 mph, with gusts as high as 25 mph.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 49. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 61. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Partly cloudy, with a low around 47.
Thursday
Mostly sunny, with a high near 65.
Thursday Night
Mostly cloudy, with a low around 48.
Friday
Partly sunny, with a high near 67.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Partly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Roscoe IL
 42.41°N 89.02°W
Last Update:
11:41 am CDT Sep 20, 2026
Forecast Valid:
1pm CDT Sep 20, 2026-6pm CDT Sep 26, 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