Sunday afternoon in the sun was pretty hot with temperatures touching 90-degrees at a few locations. Chicago’s official high at the O’Hare observing site was 88-degrees, but it didn’t “feel” humid with dew-points in the lower to middle 60s.
Monday will see afternoon highs again toy with the 90-degree mark, but dew-points should rise into the upper 60s making humidity begin to reach rather uncomfortable levels if you exert yourself at all outside.
The next three days (Tuesday through Thursday) temperatures are expected to warm into the lower 90s, and when combined with higher humidity will result in heat index figures close to or exceeding the 100-degree mark during the afternoon periods. Persons susceptible to high heat and humidity should be thinking about ways to cope with the increasingly oppressive conditions.
A cold front will move through from the northwest early Saturday preceded by showers and thunderstorms Friday and Friday night. Cooler, less humid high pressure will follow the cold front and dominate weather through much of the coming weekend.