Wisconsin Severe Extreme Heat Warning | Effective 06/29/2026 15:52

Headline: 
Extreme Heat Warning issued June 29 at 5:52PM CDT until June 30 at 7:00PM CDT by NWS Green Bay WI
Event: 
Extreme Heat Warning
Urgency: 
Expected
Effective: 
June 29, 2026 - 3:52pm
Expires: 
June 30, 2026 - 12:00am
Description: 
* WHAT...Dangerously hot conditions with heat index values up to 109 expected. Overnight heat indices will remain around 75 degrees, which will still be hazardous for anyone without shelter after the extreme heat in the afternoon. * WHERE...Marathon, Portage, Waushara, Wood, Calumet, Winnebago, Brown, Outagamie, Shawano, and Waupaca Counties. * WHEN...Until 7 PM CDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.
Instruction: 
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Area Description: 
Marathon; Shawano; Wood; Portage; Waupaca; Outagamie; Brown; Waushara; Winnebago; Calumet
Forcast Office: 
NWS Green Bay WI