Friday and Saturday's weather will be mild before snow and rain hit the area Sunday.
Friday should be breezy with a high of 69, according to the National Weather Service.
The sun will shine Saturday for St. Patrick's Day festivities with a high of 67, but rain is likely after 1 a.m. with an overnight low of 39 degrees.
A hazardous weather outlook from the National Weather Service warns of an elevated fire danger Friday afternoon through Saturday from central Missouri through southwest Illinois.
The weather will turn on Sunday with an 80 percent chance of rain and snow with temperatures falling from a high of 41 to a low of just 22. It will be breezy, with wind gusts of up to 31 mph. Light accumulation is expected.