Overview

• Saturday starts mostly cloudy with a chance of a few light predawn showers before turning partly sunny, breezy and warm near 81 degrees.
• A late-day cold front will flip southwest winds to west or northwest with increasing gusts and a rapid evening temperature drop.
• Very dry air arrives behind the front with lower humidity persisting for much of the coming week.
• Monday and Tuesday mornings will feel fall-like across the Chicago area with outlying lows possibly dipping into the 40s.
• Forecast guidance points to a broader late-August cool spell across much of the Lower 48 with the largest departures in parts of Kansas and Oklahoma.