Indianapolis, Indiana – St. Patrick’s Day week across Indiana could bring a late return of winter as colder air pushing south from Canada raises the potential for accumulating snow just days before the official start of spring.
According to the NOAA Climate Prediction Center’s 8–14 day outlook, the period from March 15 through March 21 favors above-normal precipitation across parts of the Midwest, Great Lakes, and the eastern United States, while temperatures trend below seasonal averages across much of the region. The setup develops as a large cold boundary stretches from Maine through the Great Lakes and south toward Georgia and northern Florida, allowing colder Canadian air to spill into the Ohio Valley.
That pattern places Indianapolis, Fort Wayne, South Bend, Evansville, and Lafayette in a zone where incoming storm systems could interact with colder air, increasing the chance for late-season snow or rain transitioning to snow during St. Patrick’s Day week.
Drivers along major routes including Interstate 65, Interstate 70, Interstate 69, and Interstate 74 should monitor conditions closely if storms begin organizing across the Midwest. Even light snowfall during mid-March can create slick bridges and reduced visibility during overnight hours and early morning commutes.
The timing stands out because daylight saving time begins this weekend, yet winterlike conditions may linger across the Midwest even as the first day of spring arrives later that week.
Forecasters expect additional updates in the coming days as the mid-March pattern becomes clearer, and advisories could follow if storm systems align with the colder air mass across the region.
