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.

Fog

43°F

6°C

Humidity 100%
Wind Speed N 14 mph
Barometer 29.83 in
Dewpoint 43°F (6°C)
Visibility 1.00 mi
Wind Chill36°F (2°C)
Last update 10 Mar 7:45 am CDT
Extended Forecast for

Darien WI

Dense Fog Advisory until March 10, 11:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory until March 10, 11:00am

    NOW until 11:00am Tue

    Dense Fog Advisory

  • Today

    High: 51 °F

    Dense Fog
    then Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms before 4am, then a chance of showers. Patchy fog. Low around 34. Northeast wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 34 °F

    Showers and
    Patchy Fog
    then Showers
    Likely and
    Patchy Fog

  • Wednesday

    Wednesday: Rain showers before noon, then snow showers, possibly mixed with rain between noon and 1pm, then a chance of snow showers after 1pm. High near 37. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 37 °F

    Showers then
    Rain/Snow and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 22. Northwest wind 5 to 15 mph.

    Low: 22 °F

    Gradual
    Clearing

  • Thursday

    Thursday: Increasing clouds, with a high near 46. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon.

    High: 46 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Rain likely before 4am, then rain likely, possibly mixed with snow. Mostly cloudy, with a low around 34. Windy, with a south wind 10 to 15 mph increasing to 20 to 25 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 34 °F

    Rain Likely
    and Breezy
    then
    Rain/Snow
    Likely and
    Windy

  • Friday

    Friday: A 10 percent chance of snow before 7am. Partly sunny, with a high near 45. Windy, with a west wind 20 to 25 mph, with gusts as high as 35 mph.

    High: 45 °F

    Windy. Slight
    Chance Snow
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 25. Northwest wind 5 to 10 mph becoming east after midnight.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Widespread dense fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 51. East wind 10 to 15 mph.
Tonight
Showers and thunderstorms before 4am, then a chance of showers. Patchy fog. Low around 34. Northeast wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Rain showers before noon, then snow showers, possibly mixed with rain between noon and 1pm, then a chance of snow showers after 1pm. High near 37. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Wednesday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 22. Northwest wind 5 to 15 mph.
Thursday
Increasing clouds, with a high near 46. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon.
Thursday Night
Rain likely before 4am, then rain likely, possibly mixed with snow. Mostly cloudy, with a low around 34. Windy, with a south wind 10 to 15 mph increasing to 20 to 25 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Friday
A 10 percent chance of snow before 7am. Partly sunny, with a high near 45. Windy, with a west wind 20 to 25 mph, with gusts as high as 35 mph.
Friday Night
Mostly cloudy, with a low around 25. Northwest wind 5 to 10 mph becoming east after midnight.
Saturday
A chance of snow before 1pm, then a chance of rain and snow. Cloudy, with a high near 45. Chance of precipitation is 30%.
Saturday Night
Rain likely, possibly mixed with snow, mainly after 1am. Cloudy, with a low around 31. Chance of precipitation is 70%.
Sunday
Rain and snow. High near 39. Breezy. Chance of precipitation is 80%.
Sunday Night
A 40 percent chance of snow. Cloudy, with a low around 13. Blustery.
Monday
A 20 percent chance of snow. Mostly cloudy, with a high near 26.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Darien WI
 42.59°N 88.72°W (Elev. 945 ft)
Last Update:
7:34 am CDT Mar 10, 2026
Forecast Valid:
8am CDT Mar 10, 2026-6pm CDT Mar 16, 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