FORECAST SUMMARY: Friday June 26th, 2026, through Sunday June 28th, 2026
Ozone:
Ozone concentrations are expected to be in the Good (Green AQI) to Moderate (Yellow AQI) range.
PM-2.5:
PM-2.5 concentrations are expected to be in the Good (Green AQI) to low-Moderate (Yellow AQI) range.
FORECAST DISCUSSION:
Hard to believe that June is over in just a few days and it sure is going out like a lion as temperatures look to soar next week.
Before we get there though, today, Friday, will be relatively similar to previous days this week with temperatures hanging around the low-to-mid 70s with some areas dealing with fog during the morning hours. As we go into Saturday, a High-pressure system moves into the Great Lakes which will shift our winds to east-southeasterly, aiding in a slight warm up into the upper-70s across the state. This warmup and upper-level pattern will continue into Sunday as an upper-level ridge builds in the latter half of the weekend which will be the start of the hot and humid summer temperatures Michigan will be feeling next week.
This forecast will be updated on Sunday to get a better look at early next week due to the possibility of Ozone flaring up with the hot and sunny days ahead. For this weekend, however, Ozone is expected to remain in the Good range on Saturday with increases into the Moderate range come Sunday. For PM2.5, a rather similar forecast is in store with increases into the low-Moderate are expected on Sunday, but mostly Good on Saturday.
EXTENDED FORECAST:
Both surface and upper-level temperatures are expected to increase early next week along with winds shifting to southwesterly flow. Adding clear, sunny conditions to the equation will pose a conducive environment for Ozone to develop in west Michigan and potentially southeast Michigan. The only factor that may help keep Ozone at bay will be the dewpoints, which will be in the mid-70s all next week so muggy conditions will be present. It has been observed in recent years that Ozone does not develop as it otherwise would when dewpoints reach or exceed 70 degrees. It is because of these factors that this forecast will be updated on Sunday, and possibly each day after that.