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.

Mostly Cloudy

59°F

15°C

Humidity 55%
Wind Speed E 15 G 22 mph
Barometer 30.24 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 21 May 5:45 pm CDT
Extended Forecast for

Harvard IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. East wind 10 to 15 mph.

    Low: 46 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 64. East wind around 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of showers after 4am. Cloudy, with a low around 49. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 49 °F

    Cloudy then
    Slight Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 71. East northeast wind around 5 mph.

    High: 71 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 51. East northeast wind around 5 mph becoming calm in the evening.

    Low: 51 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Partly sunny, with a high near 76. Chance of precipitation is 20%.

    High: 76 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Memorial Day

    Memorial Day: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 46. East wind 10 to 15 mph.
Friday
Mostly cloudy, with a high near 64. East wind around 15 mph, with gusts as high as 25 mph.
Friday Night
A 20 percent chance of showers after 4am. Cloudy, with a low around 49. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 71. East northeast wind around 5 mph.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 51. East northeast wind around 5 mph becoming calm in the evening.
Sunday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Partly sunny, with a high near 76. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 52.
Memorial Day
Mostly sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
A chance of showers. Partly sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 58.
Thursday
A chance of showers. Partly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harvard IL
 42.44°N 88.61°W
Last Update:
4:06 pm CDT May 21, 2026
Forecast Valid:
6pm CDT May 21, 2026-6pm CDT May 28, 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