FORECAST SUMMARY: Monday September 22, 2025, through Friday September 26, 2025
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 Moderate (Yellow AQI) range.
FORECAST DISCUSSION:
Much needed rain has been intermittently falling across the state for the past 24 hours with spotty rain showers expected to persist through midweek. Continuous Low-pressure systems and associated frontal boundaries look to sit over Michigan today, Monday, through Wednesday night before moving off to the east come Thursday morning. Surface temperatures slightly above seasonal norms are expected this week as well, with the exception of Wednesday, which is due to rain showers throughout the day on Wednesday. A total washout is not expected with rain totals Thursday morning expected to hover around the half inch to inch mark for areas across the lower peninsula. The upper peninsula has been receiving rain rather frequently compared to the lower peninsula and that can be seen on the drought map as the majority of the lower peninsula is in some form of drought stage. After the rain moves off to the east, however, clearing skies return for Thursday and Friday with surface temperatures returning to the mid-to-high 70s.
For air quality, the cloudy, rain skies coupled with cooler temperatures will keep Ozone concentrations at bay unlike last week where a few high-Moderate and even some Unhealthy for Sensitive Groups concentrations were observed due to the warmer temperatures. That will not be the case this week as we move closer to the end of Ozone season. Aside from morning commutes increasing PM-2.5 values, PM-2.5 concentrations do not look to be an issue this week either with Good to low-Moderate concentrations expected.
EXTENDED FORECAST:
Clearing skies and warmer temperatures return for the weekend ahead. Air quality should range between the Good and Moderate range.
Next Forecast update: Friday September 26th, 2025