Department meteorologists use monitoring data and weather forecast models to predict Wisconsin's future ozone (O₃) and fine particulate matter (PM_2.5) 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 Thursday, October 9 - 10:10 AM

Thursday, October 9 - Wednesday, October 15, 2025

Ozone

Good (Green) AQI levels.

Particle pollution (PM_2.5)

Good (Green) 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 through the short-term period. Pleasant and seasonably warm fall weather is forecast for much of Thursday as high pressure continues to move east across the Great Lakes region. Increasing cloud cover and precipitation chances will then move from west to east Thursday evening through Friday afternoon as a front passes through the state. Behind this front, a secondary high pressure air mass will allow mostly pleasant conditions to continue Saturday.

Extended Outlook (Days 4-7)

Good AQI is forecast through the extended period. On Sunday, breezy southeasterly flow will be moving in from the west as a low pressure system strengthens over the northern Plains. Precipitation chances will be increasing Sunday afternoon in western areas, before pushing east ahead of a front through the day on Monday. High pressure moving in behind the front should then maintain mostly dry and seasonable to slightly cool conditions through Wednesday.

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].