It depends upon how much cloudiness develops, but with enough sunshine Sunday’s high temperature could reach into the upper 80s, exceeding the existing record 86° high set on this date back in 1947. Even without the record the day will be very warm and humid, with the morning temperatures just prior to the start of the LaSalle Bank Chicago Marathon expected to be in the lower 70s. If that is the case, another record—this one set ninety-three years ago—will be broken. The record high low temperature for October 7th was 66 degrees set back in 1914. Clouds will increase from the west, and the approach of a cold front should trigger showers and thunderstorms later Monday. Colder Canadian high pressure will move into the Midwest Tuesday with the core of coldest air over NE Illinois Wednesday and Thursday. A drop of some 30° in high temperatures from today’s upper 80s to Wednesday’s forecast mid 50s is possible.
--By Paul Dailey, WGN Weather Center Meteorologist
WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.
