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 94%
Wind Speed W 3 mph
Barometer 29.96 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 27 Aug 12:55 am CDT
Extended Forecast for

Fort Atkinson WI

  • Overnight

    Overnight: Mostly clear, with a low around 60. Calm wind becoming northwest around 5 mph.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 81. Northwest wind 5 to 10 mph.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57. Northwest wind around 5 mph becoming calm.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 82. Calm wind becoming west around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 60. Calm wind becoming south around 5 mph after midnight.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 80. South wind 5 to 10 mph.

    High: 80 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. South wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Showers
    Likely

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 60. Calm wind becoming northwest around 5 mph.
Thursday
Mostly sunny, with a high near 81. Northwest wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 57. Northwest wind around 5 mph becoming calm.
Friday
Sunny, with a high near 82. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 60. Calm wind becoming south around 5 mph after midnight.
Saturday
Mostly cloudy, with a high near 80. South wind 5 to 10 mph.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. South wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Southwest wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Monday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 88.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Tuesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 65.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fort Atkinson WI
 42.92°N 88.84°W (Elev. 797 ft)
Last Update:
12:31 am CDT Aug 27, 2026
Forecast Valid:
1am CDT Aug 27, 2026-6pm CDT Sep 2, 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