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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

66°F

19°C

Humidity 94%
Wind Speed Calm
Barometer 30.16 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 28 Aug 8:45 am CDT
Extended Forecast for

Rockton IL

  • Today

    Today: Sunny, with a high near 82. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 60. West wind around 5 mph becoming south after midnight.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 79. South wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 79 °F

    Partly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 66. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86. South southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88.

    High: 88 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy
    then Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 82. Calm wind becoming west southwest around 5 mph in the afternoon.
Tonight
Partly cloudy, with a low around 60. West wind around 5 mph becoming south after midnight.
Saturday
A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 79. South wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 66. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Sunday
A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86. South southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88.
Monday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 67.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rockton IL
 42.45°N 89.08°W
Last Update:
1:21 am CDT Aug 28, 2026
Forecast Valid:
9am CDT Aug 28, 2026-6pm CDT Sep 3, 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