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

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

A Few Clouds

81°F

27°C

Humidity 70%
Wind Speed S 3 mph
Barometer 29.87 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 11 Aug 6:45 pm CDT
Extended Forecast for

Harvard IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after midnight. Areas of fog after 1am. Otherwise, mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms and
    Areas Fog

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly before 1pm. Areas of fog before 9am. Otherwise, partly sunny, with a high near 82. Calm wind becoming southwest around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Showers
    Likely and
    Areas Fog

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers, mainly after 4am. Increasing clouds, with a low around 65. West southwest wind around 5 mph becoming calm.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 78 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 63. Northeast wind around 5 mph, with gusts as high as 15 mph.

    Low: 63 °F

    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 77.

    High: 77 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 63. Chance of precipitation is 60%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80.

    High: 80 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after midnight. Areas of fog after 1am. Otherwise, mostly cloudy, with a low around 66. Calm wind.
Wednesday
Showers and thunderstorms likely, mainly before 1pm. Areas of fog before 9am. Otherwise, partly sunny, with a high near 82. Calm wind becoming southwest around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A 50 percent chance of showers, mainly after 4am. Increasing clouds, with a low around 65. West southwest wind around 5 mph becoming calm.
Thursday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 70%.
Thursday Night
A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 63. Northeast wind around 5 mph, with gusts as high as 15 mph.
Friday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 77.
Friday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 63. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80.
Saturday Night
A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 68.
Sunday
A chance of showers before 1pm. Partly sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 62.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Harvard IL
 42.42°N 88.61°W
Last Update:
6:31 pm CDT Aug 11, 2026
Forecast Valid:
7pm CDT Aug 11, 2026-6pm CDT Aug 18, 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