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

61°F

16°C

Humidity 83%
Wind Speed Calm
Barometer 29.87 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 12 Oct 3:15 am CDT
Extended Forecast for

Harvard ILSimilar City Names

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 61. South southwest wind around 5 mph, with gusts as high as 15 mph.

    Low: 61 °F

    Mostly Cloudy

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 68. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80. West wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 80 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 59. Calm wind. Chance of precipitation is 70%.

    Low: 59 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 69.

    High: 69 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Showers likely. Mostly cloudy, with a high near 66.

    High: 66 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers before 1am. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 61. South southwest wind around 5 mph, with gusts as high as 15 mph.
Columbus Day
Mostly sunny, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 68. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Sunny, with a high near 80. West wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 59. Calm wind. Chance of precipitation is 70%.
Wednesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 69.
Wednesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 52.
Thursday
Showers likely. Mostly cloudy, with a high near 66.
Thursday Night
A chance of showers before 1am. Mostly cloudy, with a low around 46.
Friday
Partly sunny, with a high near 56. Breezy.
Friday Night
Mostly clear, with a low around 33.
Saturday
Sunny, with a high near 55.
Saturday Night
Mostly clear, with a low around 37.
Sunday
Sunny, with a high near 62.
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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:
2:40 am CDT Oct 12, 2026
Forecast Valid:
3am CDT Oct 12, 2026-6pm CDT Oct 18, 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