Despite a weak cold front moving through from the north Sunday, the sun should break out with Chicago-area temperatures peaking around the 60-degree mark at many locations Sunday afternoon. While the light northeasterly winds behind the cold front probably won't impact conditions well inland away from Lake Michigan, in Chicago proper and right along and just inland of the lakefront, fog could present a problem. The dew point (temperature at which fog or clouds form) of the air immediately behind the cold front will be in the middle 40s - slightly warmer than Lake Michigan surface water temperatures. Under such conditions, dense fog may form over the lake, and riding the northeast wind, drift inland - cutting visibilities significantly and perhaps impacting the Bears football game at Soldier Field.
Winds will pick up out of the southwest overnight into Monday. Clouds will be on the increase as a cold front approaches from the west, but afternoon temperatures should still reach well into the 60s. Showers with perhaps even some thunder should sweep through along and ahead of the cold front Monday evening. Cooler, but still above-normal temperatures are expected the remainder of the workweek with even colder air and a chance for the first measurable snow coming up next weekend.