National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat in the Central and Eastern U.S.; Severe Thunderstorms in the Great Lakes

Thunderstorms with strong wind gusts and hail will be possible today from Michigan into the Lower Great Lakes region. A significant and dangerous heat wave will expand from the Central U.S. into the Eastern U.S this weekend through much of next week. Numerous daily record highs and warm lows are likely. Read More >

Hazardous Weather Conditions

Current conditions at

Wittman Regional Airport (KOSH)

Lat: 43.97°NLon: 88.56°WElev: 801ft.

Fair and Breezy

90°F

32°C

Humidity 59%
Wind Speed SW 22 G 44 mph
Barometer 29.62 in (1001.4 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 21 Jun 2:53 pm CDT
Extended Forecast for

Berlin WI

Heat Advisory June 21, 03:32pm until June 23, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 21, 03:32pm until June 23, 07:00pm

    NOW until 7:00pm Mon

    Heat Advisory

  • Tonight

    Low: 80 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 93. Heat index values as high as 102. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 93 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Clear, with a low around 79. Southwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 79 °F

    Clear

  • Monday

    Monday: A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Sunny and hot, with a high near 91. Heat index values as high as 97. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 91 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 69. West wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 69 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. North wind 5 to 10 mph becoming east in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 80 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 62. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    Low: 62 °F

    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 76. East wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 76 °F

    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 80. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.
Sunday
Sunny and hot, with a high near 93. Heat index values as high as 102. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Clear, with a low around 79. Southwest wind around 15 mph, with gusts as high as 25 mph.
Monday
A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Sunny and hot, with a high near 91. Heat index values as high as 97. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Monday Night
Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 69. West wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. North wind 5 to 10 mph becoming east in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm. Low around 62. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Wednesday
Showers and possibly a thunderstorm. High near 76. East wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm. Low around 63. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Berlin WI
 43.96°N 88.93°W (Elev. 764 ft)
Last Update:
1:54 pm CDT Jun 21, 2025
Forecast Valid:
3pm CDT Jun 21, 2025-6pm CDT Jun 28, 2025
 
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