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.

Fair

52°F

11°C

Humidity 41%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 15 Feb 5:45 pm CST
Extended Forecast for

Harvard ILSimilar City Names

  • Tonight

    Tonight: Increasing clouds, with a low around 35. Light and variable wind becoming south southwest 5 to 10 mph after midnight.

    Low: 35 °F

    Increasing
    Clouds

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 60. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 60 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 36. West wind around 5 mph becoming east southeast after midnight.

    Low: 36 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 54. East southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 54 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Showers likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 48. Southeast wind around 15 mph becoming south southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 30 percent chance of showers before noon. Sunny, with a high near 62. Breezy.

    High: 62 °F

    Breezy.
    Chance
    Showers then
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain after noon. Partly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A chance of rain. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Chance Rain

Detailed Forecast

Tonight
Increasing clouds, with a low around 35. Light and variable wind becoming south southwest 5 to 10 mph after midnight.
Washington's Birthday
Mostly sunny, with a high near 60. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 36. West wind around 5 mph becoming east southeast after midnight.
Tuesday
Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 54. East southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Showers likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 48. Southeast wind around 15 mph becoming south southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of showers before noon. Sunny, with a high near 62. Breezy.
Wednesday Night
Partly cloudy, with a low around 34.
Thursday
A chance of rain after noon. Partly sunny, with a high near 53.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 31.
Friday
A chance of rain and snow before noon. Partly sunny, with a high near 41.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 37.
Saturday Night
Mostly cloudy, with a low around 19.
Sunday
Mostly sunny, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Harvard ILSimilar City Names
 42.42°N 88.61°W
Last Update:
3:11 pm CST Feb 15, 2026
Forecast Valid:
6pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
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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