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, January 12 - 9:50 AM

Monday, January 12 - Sunday, January 18, 2026

Ozone

Good (Green) AQI levels.

Particle pollution (PM2.5)

Good (Green) to Moderate (Yellow) AQI levels.

Short-Term Forecast Maps:

Forecast AQI maps for the short-term forecast period.

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)

Mostly sunny skies and WSW winds Monday will lead to mild temperatures across the state. Although mostly Good (Green) AQI is anticipated, some areas of Moderate (Yellow) AQI PM2.5 will be possible downwind of the Twin Cities. Seasonably mild temperatures will continue Tuesday as a system moves across the northern Great Lakes with some precipitation possible, mostly across northern Wisconsin. Mostly Good (Green) AQI is forecast to continue. By Wednesday, blustery northerly flow will bring in dry air and push temperatures back down to normal values, maintaining Good (Green) AQI.

Extended Outlook (Days 4-7)

Temperatures will remain near normal through much of Thursday ahead of the next system, which is poised to move through the state on Friday. Light precipitation is likely, but any snow accumulations will be minimal. A blast of cold air behind this system will keep temperatures below normal for the weekend, with another shot of light snow potential during the Sunday to Monday timeframe. Mostly Good AQI is expected during the extended period, with the best chance for Moderate AQI to redevelop on Friday.

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].