Temperatures go from the 60s to the mid 80s Wednesday. Areas west of Interstate 55 could near the upper 80s instead. A cloudless day turns into a clear night and temperatures will fall to the upper 50s and low 60s Thursday morning. Highs for the first day of the state fair could be the warmest in the 7 day with many areas hinting at 90 degrees. Clear skies turn partly cloudy by Thursday afternoon.