Department meteorologists use monitoring data and weather forecast models to predict Wisconsin's future ozone (O3) and fine particulate matter (PM2.5) air quality using the Air Quality Index (AQI) [exit DNR]. This forecast is updated two-to-three times weekly throughout the year, and when warranted, an Air Quality Advisory is issued. Below is the latest air quality forecast for Wisconsin.
Updated Monday, November 17 - 11:10 AM
Monday, November 17 - Sunday, November 23, 2025
Ozone
Good (Green) AQI levels.
Particle pollution (PM2.5)
Good (Green) to Moderate (Yellow) AQI levels.
Short-Term Forecast Maps:
The black dots represent the approximate location of Wisconsin's air quality monitors. Read the forecast summaries below for further geographic information.
Short-Term Forecast (Days 1-3)
Good (Green) AQI is forecast for the short-term forecast period. Winds will be light and variable today as surface high pressure remains over the region, with high temperatures in the mid 40s. A low pressure system will pass south of Wisconsin tomorrow, shifting winds to easterly and bringing a mix of rain and snow. High pressure influence will return on Wednesday behind the passing low, with gentle southerly winds and high temperatures in the mid 30s to low 40s.
Extended Outlook (Days 4-7)
An active weather pattern later this week will encourage continued Good AQI through the extended outlook. Long-range guidance suggests another low pressure system passing to the north of Wisconsin on Thursday, with an associated cold front pushing through the state Thursday evening into Friday morning. Northwesterly flow will likely hold though Friday before another approaching system shifts winds to southerly on Saturday as we head into the weekend. Though Good AQI is expected throughout the extended outlook, there will be potential for Moderate (Yellow) AQI associated with PM2.5 secondary formation.
Air Quality Index (AQI) ranges
For more information about AQI ranges and colors, see the U.S. EPA's Air Quality Index (AQI) Basics [exit DNR].