As meteorological summer nears its end, the Chicago area is gearing up for an extended run of hot weather.
So far this summer, the city has officially logged just seven 90-degree-plus days, including four in a row from July 16-19, but readings are expected to surge into the lower 90s Sunday marking the start of an extended late-season heat wave that could last through Labor Day. Increasing humidity levels will accompany the hot weather as dew points climb into the 70s sending heat indexes soaring to triple-digits on Monday and Tuesday.
A weak cold front will trigger a few thunderstorms Wednesday or Wednesday night as less humid air arrives for Thursday and Friday. Inland temperatures are still expected to peak around 90, but lake breezes will keep lakeside readings in the 80s.