DETROIT, MICHIGAN — Michigan is experiencing its last comfortable day before conditions turn dangerous. On Sunday, June 28, 2026, temperatures across the state are climbing into the low-to-mid 80s under mostly sunny skies — but residents should not let the pleasant weather create a false sense of security. A severe heatwave is set to arrive Monday, and officials are urging everyone to take immediate action before it does.
Temperatures today
The Lower Peninsula is running uniformly warm. Detroit, Pontiac, Flint, and Grand Rapids are all reaching 83 to 84 degrees. Kalamazoo, Lansing, and Saginaw are reporting highs in the low 80s. In the Upper Peninsula, temperatures remain cooler — Marquette tops out at 75 degrees, while Houghton and Ironwood reach 80. These relatively manageable readings will not last.
The real danger: rising humidity
While today’s temperatures are not extreme, dewpoints are climbing into the 60s across the state — a critical early signal of the dangerous air mass moving in. By Monday, heat index values are expected to surge well into the triple digits. Residents who have underlying health conditions, elderly family members, or young children in their care need to act now, not after the heat arrives.
Upper Peninsula: storm risk tonight
While most of Michigan stays dry through Sunday, the western Upper Peninsula carries a chance of showers during the day, with storm chances increasing across the broader UP Sunday night into Monday morning. Campers, hikers, and anyone with overnight outdoor plans in the region should monitor conditions closely and have an exit plan ready.
What you should do right now
Residents are urged to stock up on water, confirm that air conditioning units are working, and identify cooling centers in their area. Check on elderly neighbors and relatives who may not have air conditioning. Do not leave children or pets unattended in vehicles at any point during the coming days. The heat emergency arriving Monday is not a minor weather inconvenience — it is a serious threat to life.
