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.

Fair

36°F

2°C

Humidity 87%
Wind Speed Calm
Barometer 29.88 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 6 May 2:35 am CDT
Extended Forecast for

Fort Atkinson WI

Frost Advisory until May 6, 08:00am
Click here for hazard details and duration
Frost Advisory
  •  
    Frost Advisory until May 6, 08:00am

    NOW until 8:00am Wed

    Frost Advisory

  • Overnight

    Low: 33 °F

    Frost

  • Wednesday

    Wednesday: Widespread frost, mainly before 7am. Otherwise, partly sunny, with a high near 54. Northwest wind 5 to 10 mph.

    High: 54 °F

    Frost then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Widespread frost, mainly after 5am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 34. Northwest wind 5 to 10 mph becoming light west in the evening.

    Low: 34 °F

    Partly Cloudy
    then Frost

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Areas of frost before 8am. Otherwise, mostly sunny, with a high near 58. Light southwest wind becoming west 5 to 10 mph in the morning. Chance of precipitation is 30%.

    High: 58 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 39. West wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers. Partly sunny, with a high near 63. Calm wind becoming west around 5 mph in the morning.

    High: 63 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 44. Calm wind becoming southwest around 5 mph after midnight.

    Low: 44 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 71. Southwest wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 71 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Overnight
Widespread frost, mainly after 4am. Otherwise, partly cloudy, with a low around 33. Calm wind.
Wednesday
Widespread frost, mainly before 7am. Otherwise, partly sunny, with a high near 54. Northwest wind 5 to 10 mph.
Wednesday Night
Widespread frost, mainly after 5am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 34. Northwest wind 5 to 10 mph becoming light west in the evening.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Areas of frost before 8am. Otherwise, mostly sunny, with a high near 58. Light southwest wind becoming west 5 to 10 mph in the morning. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 39. West wind around 5 mph becoming calm in the evening.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 63. Calm wind becoming west around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 44. Calm wind becoming southwest around 5 mph after midnight.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 71. Southwest wind 5 to 15 mph, with gusts as high as 30 mph.
Saturday Night
A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 44.
Sunday
Mostly sunny, with a high near 61.
Sunday Night
Partly cloudy, with a low around 39.
Monday
Sunny, with a high near 61.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 41.
Tuesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 67.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fort Atkinson WI
 42.92°N 88.84°W (Elev. 797 ft)
Last Update:
2:37 am CDT May 6, 2026
Forecast Valid:
2am CDT May 6, 2026-6pm CDT May 12, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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