Chief Meteorologist Keith Monohan tells us rain and cool temps are expected, but organizers say, no biggie!
They tell us they won't cancel the event unless ice or tornadoes in the forecast. Runners say they say can handle rain.
"Wear a trash bag, wear a raincoat and layer up underneath. It's fun. You can make it a whole lot of fun," says marathon organizer Gina Pharis.
The marathon starts at 6 a.m. Sunday morning.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.