FORECAST SUMMARY: Monday, September 15, 2025, through Friday, September 19, 2025
OZONE: 8-hour average Ozone concentrations are expected to be mostly Good (AQI Green) to Low Moderate (AQI Yellow). There is a slight chance of isolated USG (AQI Orange).
PM-2.5: 24-hour average Fine Particulate concentrations are expected to be Good (AQI Green) to Moderate (AQI Yellow).
FORECAST DISCUSSION
The last full week of summer will feature summer-like weather with temperatures reaching the mid to upper 80’s with low humidity and clear skies. Ideal weather to be outside before the cooler weather of Fall arrives.
This time of year usually produces Good Air Quality. Wildfire smoke is currently contained to the northern provinces of Canada is not presenting a problem. Ozone production is still possible, as we saw a few scattered, single monitor Low USG readings, last week. However, since the days are getting shorter and the nights are getting cooler, no widespread USG conditions are expected. It is possible that an isolated monitor could reach Low USG, however.
The 7-day forecast has the current weather pattern remaining in place. With no turnover in air mass we can expect fine particulates to accumulate but no worse than the Moderate levels of the AQI are expected. As mentioned above, ozone production could yield some isolated Low USG readings, but widespread Moderate readings are more likely.
EXTENDED FORECAST:
Air Quality is expected to remain Good to Moderate entering the upcoming weekend.