Wisconsin Severe Extreme Heat Warning | Effective 06/30/2026 11:40

Headline: 
Extreme Heat Warning issued June 30 at 1:40PM CDT until July 1 at 7:00PM CDT by NWS Milwaukee/Sullivan WI
Event: 
Extreme Heat Warning
Urgency: 
Expected
Effective: 
June 30, 2026 - 11:40am
Expires: 
June 30, 2026 - 7:45pm
Description: 
* WHAT...Dangerously hot conditions with heat index values up to 105. * WHERE...Portions of east central, south central, and southeast Wisconsin. * WHEN...Until 7 PM CDT Wednesday. * 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. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. Stay cool, stay hydrated, stay informed.
Area Description: 
Marquette; Green Lake; Fond Du Lac; Sheboygan; Sauk; Columbia; Dodge; Washington; Ozaukee; Iowa; Dane; Jefferson; Waukesha; Milwaukee; Lafayette; Green; Rock; Walworth; Racine; Kenosha
Forcast Office: 
NWS Milwaukee/Sullivan WI