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.

Fog

57°F

14°C

Humidity 100%
Wind Speed Calm
Barometer 30.14 in
Dewpoint 57°F (14°C)
Visibility 0.25 mi
Last update 28 Aug 6:45 am CDT
Extended Forecast for

Harvard ILSimilar City Names

  • Today

    Today: Patchy fog before 8am. Otherwise, sunny, with a high near 81. Calm wind becoming west around 5 mph in the morning.

    High: 81 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 60. South southwest wind around 5 mph.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers after 2pm. Increasing clouds, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 78 °F

    Partly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 66. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 4pm. Partly 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
    Showers then
    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 69.

    Low: 69 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers after 1am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, sunny, with a high near 81. Calm wind becoming west around 5 mph in the morning.
Tonight
Partly cloudy, with a low around 60. South southwest wind around 5 mph.
Saturday
A 30 percent chance of showers after 2pm. Increasing clouds, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 66. South wind around 10 mph, with gusts as high as 20 mph.
Sunday
A slight chance of showers, with thunderstorms also possible after 4pm. Partly 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 69.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.
Monday Night
A chance of showers after 1am. Mostly cloudy, with a low around 71.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 68.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 86.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harvard ILSimilar City Names
 42.42°N 88.61°W
Last Update:
1:21 am CDT Aug 28, 2026
Forecast Valid:
7am CDT Aug 28, 2026-6pm CDT Sep 3, 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