FORECAST SUMMARY: Friday, August 22, 2025 - Monday, August 25, 2025
Ozone: 8-hour ozone concentrations are expected to range mostly Good (Green AQI) with a few Moderate (Yellow AQI) concentrations possible south on Friday and Saturday.
PM-2.5: 24-hour daily average Fine Particulate concentrations will average Good with a few low Moderates Friday and Saturday.
FORECAST DISCUSSION:
This weekend Michigan will experience fall-like conditions for the first time this season. The cool down happens as cold air filters in behind a cold front tracking northwest to southeast today, Friday, through Saturday. Precipitation also moves in, starting in the upper peninsula Friday and continuing into the lower peninsula Saturday. High temperatures on Friday will range from the 70s in the north to the 80s in the south. By Sunday, high temperatures will struggle to reach the 60s in the upper peninsula and the low to mid 70s in the south. Low temperatures will fall into the 40s later in the forecast period. Temperatures on Sunday will be cold enough for lake effect precipitation to develop due to the cold northwesterly flow over the warmer lake water.
For air quality, mostly Good levels of both ozone and fine particulate can be expected this forecast period. The only chance for low Moderate concentrations for either pollutant would be Friday or Saturday in southern locations. Earlier this summer northwest winds have brought increased PM2.5 concentrations due to the Canadian wildfires. We did evaluate current smoke conditions, and while the Canadian fires persist, the fire intensities are currently low, and they are not generating much smoke. Because of this, we do not expect an increase in PM2.5 concentrations this forecast period.
EXTENDED FORECAST:
Cool Canadian air lingers into the new workweek, and we expect Good air quality levels during this period.
Next Forecast update: Monday, August 25, 2025