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.

Freezing Fog

27°F

-3°C

Humidity 100%
Wind Speed Calm
Barometer 30.20 in
Dewpoint 27°F (-3°C)
Visibility 0.25 mi
Last update 4 Mar 6:45 am CST
Extended Forecast for

Janesville WI

Dense Fog Advisory March 4, 07:05am until March 4, 09:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory March 4, 07:05am until March 4, 09:00am

    NOW until 9:00am Wed

    Dense Fog Advisory

  • Today

    High: 54 °F

    Dense Fog
    then Partly
    Sunny

  • Tonight

    Tonight: A 50 percent chance of rain, mainly after 1am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 39. East wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Mostly Cloudy
    then Chance
    Rain and
    Patchy Fog

  • Thursday

    Thursday: Rain likely, mainly before noon. Patchy fog before noon. Otherwise, cloudy, with a high near 50. Northeast wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 50 °F

    Rain Likely
    and Patchy
    Fog then
    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain after 3am. Mostly cloudy, with a low around 40. Calm wind becoming southeast around 5 mph after midnight.

    Low: 40 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Friday

    Friday: Rain and possibly a thunderstorm. High near 66. Southeast wind 5 to 15 mph becoming south in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 66 °F

    Rain

  • Friday Night

    Friday Night: Rain before 9pm, then rain and possibly a thunderstorm between 9pm and midnight, then rain after midnight. Low around 42. South wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 42 °F

    Rain

  • Saturday

    Saturday: A 20 percent chance of rain before noon. Mostly cloudy, then gradually becoming sunny, with a high near 51. Northwest wind 10 to 15 mph.

    High: 51 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 33. Southwest wind around 10 mph.

    Low: 33 °F

    Mostly Clear

Detailed Forecast

Today
Widespread dense fog before 8am. Otherwise, mostly sunny, with a high near 54. Calm wind becoming east around 5 mph in the morning.
Tonight
A 50 percent chance of rain, mainly after 1am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 39. East wind around 5 mph becoming calm in the evening.
Thursday
Rain likely, mainly before noon. Patchy fog before noon. Otherwise, cloudy, with a high near 50. Northeast wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A 20 percent chance of rain after 3am. Mostly cloudy, with a low around 40. Calm wind becoming southeast around 5 mph after midnight.
Friday
Rain and possibly a thunderstorm. High near 66. Southeast wind 5 to 15 mph becoming south in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Rain before 9pm, then rain and possibly a thunderstorm between 9pm and midnight, then rain after midnight. Low around 42. South wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
A 20 percent chance of rain before noon. Mostly cloudy, then gradually becoming sunny, with a high near 51. Northwest wind 10 to 15 mph.
Saturday Night
Mostly clear, with a low around 33. Southwest wind around 10 mph.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 41.
Monday
Sunny, with a high near 68.
Monday Night
A 20 percent chance of rain and thunderstorms. Mostly clear, with a low around 49.
Tuesday
Rain likely. Partly sunny, with a high near 65. Chance of precipitation is 70%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
Last Update:
5:42 am CST Mar 4, 2026
Forecast Valid:
7am CST Mar 4, 2026-6pm CDT Mar 10, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation