Joseph Prezioso / AFP via Getty Images The last nor'easter in September, taken in Scituate, Massachusetts.

A potential nor'easter later this week could bring the season's first snowfall, with rain, coastal flooding, and freezing temperatures possible from the Great Lakes to Florida's Gulf Coast.

Meteorologists at The Weather Channel predict daytime high temperatures from Chicago to Atlanta will fall 20 degrees between Wednesday and Friday.

Rain is also expected from Georgia to Michigan by Wednesday night, and the interior Northeast could see rain by Thursday night, which could mix with or become wet snow.

By the weekend, meteorologists say temperatures could fall into the 30s and spread as far south as the Florida Panhandle.

Usually occurring between September and April, a nor'easter is a type of storm that forms along the US East Coast and typically brings winds from the Northeast, per the National Weather Service .

The weekend is harder to predict

Meteorologists said the weekend is more difficult to…