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.

Overcast

50°F

10°C

Humidity 43%
Wind Speed NE 17 mph
Barometer 30.32 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 21 May 9:45 am CDT
Extended Forecast for

Janesville WI

  • Today

    Today: A slight chance of sprinkles after 10am. Mostly cloudy, with a high near 59. East wind 10 to 15 mph.

    High: 59 °F

    Slight Chance
    Sprinkles

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. East wind around 10 mph.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 4pm. Partly sunny, with a high near 65. East wind 10 to 15 mph.

    High: 65 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly after 1am. Cloudy, with a low around 50. East wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 50 °F

    Showers
    Likely

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 73. Northeast wind around 5 mph becoming northwest in the afternoon.

    High: 73 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Northwest wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 53. Northwest wind around 5 mph becoming calm.

    Low: 53 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of sprinkles after 10am. Mostly cloudy, with a high near 59. East wind 10 to 15 mph.
Tonight
Mostly cloudy, with a low around 45. East wind around 10 mph.
Friday
A 20 percent chance of showers after 4pm. Partly sunny, with a high near 65. East wind 10 to 15 mph.
Friday Night
Showers likely, mainly after 1am. Cloudy, with a low around 50. East wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 73. Northeast wind around 5 mph becoming northwest in the afternoon.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Northwest wind around 5 mph becoming calm in the evening.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 53. Northwest wind around 5 mph becoming calm.
Memorial Day
Mostly sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 59.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.67°N 89.04°W (Elev. 774 ft)
Last Update:
9:01 am CDT May 21, 2026
Forecast Valid:
9am CDT May 21, 2026-6pm CDT May 27, 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