Chicago’s official high temperature on Saturday reached 65 degrees, which is normal for the 9th of October.
Temperatures more typical of early October will be common across much of the Great Lakes region through Sunday. The reservoir of unseasonably cool air responsible for this weekend’s chill is forecast to begin moving away from the Chicago area Monday. This, combined with an increase in sunshine will allow temperatures to begin a steady moderation through the upcoming work week. By Wednesday, readings are expected to climb back to more seasonable levels. Temperature trends observed this summer have exhibited large fluctuations, with hot spells punctuated by extended periods of below normal readings. Extended range forecasts suggest these temperature oscillations will persist during August.