FORECAST SUMMARY: Monday, September 29, 2025 - Friday, October 3, 2025
Ozone: 8-hour ozone concentrations are expected to range mostly Good (Green AQI), with some scattered Moderates (Yellow AQI) possible.
PM-2.5: 24-hour daily average Fine Particulate concentrations will average between Good and Moderate.
FORECAST DISCUSSION:
As September ends and we move into October, warm and dry conditions continue across Michigan. Upper-level ridging and surface high pressure are the dominating weather features this week aside from a weak, dry front passing north to south on Tuesday. Temperatures behind this boundary will decrease to around 70 degrees between Tuesday and Thursday; otherwise, highs around 80 degrees are likely. Clear skies allow for favorable radiational cooling at night, and lows through the week range between the mid-40s and low-50s.
Air quality is not expected to be an issue during this forecast period, and we anticipate that AQI levels will range from Good to low-Moderate.
EXTENDED FORECAST:
Extended models show a cold front possibly bringing precipitation to northern locations this coming weekend. Warmer temperatures continue in the long term, with air quality concentrations remaining between Good and low-Moderate.
Next Forecast update: Friday, October 3, 2025