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

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Partly Cloudy

54°F

12°C

Humidity 30%
Wind Speed SW 9 mph
Barometer 30.25 in
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 20 Apr 2:45 pm CDT
Extended Forecast for

Harvard IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 54. South southwest wind around 10 mph, with gusts as high as 15 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 43. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 73. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 73 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 46. West wind around 5 mph becoming northeast after midnight. Winds could gust as high as 10 mph.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72. East northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 59.

    Low: 59 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 71.

    High: 71 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 54. South southwest wind around 10 mph, with gusts as high as 15 mph.
Tonight
Mostly cloudy, with a low around 43. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Mostly sunny, with a high near 73. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 46. West wind around 5 mph becoming northeast after midnight. Winds could gust as high as 10 mph.
Wednesday
Sunny, with a high near 72. East northeast wind 5 to 10 mph becoming southeast in the afternoon.
Wednesday Night
Partly cloudy, with a low around 53.
Thursday
Mostly sunny, with a high near 78.
Thursday Night
A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 59.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 71.
Friday Night
A chance of showers before 1am. Partly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 63.
Saturday Night
Mostly cloudy, with a low around 44.
Sunday
Partly sunny, with a high near 61.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harvard IL
 42.42°N 88.61°W
Last Update:
2:36 pm CDT Apr 20, 2026
Forecast Valid:
3pm CDT Apr 20, 2026-6pm CDT Apr 26, 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