Wisconsin Public Radio

Heat Index in Milwaukee Could Hit 107 Degrees

Most of Wisconsin faces extreme heat warning through Tuesday night.

By , Wisconsin Public Radio - Jun 29th, 2026 11:56 am
Andrew Bowden (CC-BY-SA 2.0)

Andrew Bowden (CC-BY-SA 2.0)

Wisconsinites will face dangerous heat indexes Monday — and the heat will stick around through the holiday weekend.

Temperatures will reach the 90s in the southern two-thirds of the state. Heat indexes on Monday and Tuesday will be as high as 107 degrees, according to the National Weather Service Milwaukee/Sullivan, with even overnight heat index values remaining in the upper 70s.

Severe heat can be deadly. The National Weather Service issued an extreme heat warning through 7 p.m. Tuesday. To reduce the risk of heat-related illnesses, drink plenty of fluids, stay out of the sun and in air conditioning if available. Try to limit strenuous activities to early morning or evening.

If working outside, take breaks and stay hydrated. And check on those who might be affected by the heat.

Many cities have designated cooling sites such as libraries for those who need access to air conditioning.

Forecasters expect heat advisories in the north and extreme heat warnings in the south of the state to be extended at least through Tuesday afternoon. Temperatures could hit the 90s each day through at least Thursday. A chance of storms Friday and Saturday may mean a reduction in the extreme heat.

Wisconsin will see hot and humid conditions with potentially dangerous heat index values this week. Source: National Weather Service Milwaukee/Sullivan

Wisconsin will see hot and humid conditions with potentially dangerous heat index values this week. Source: National Weather Service Milwaukee/Sullivan

Most of Wisconsin faces extreme heat warning as heat index to top 100 was originally published by Wisconsin Public Radio.

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