Saturday’s high temperatures topped out at 90° at O’Hare, 91° at Midway, and 92° at the lakefront, the fifth time this year Chicago crossed the 90° threshold. Normally, Midway’s seasonal total of 90° days would be 7 days by July 1, with O’Hare at 6 days. Sunday’s chance at 90° diminishes as the chance for clouds and thunderstorms increase.
An unstable atmosphere and nearby respectable summer jet stream team up for a chance of severe weather and heavy rain at Chicago. This severe weather threat covers a wide swath from Wyoming and Colorado eastward to the Atlantic seaboard right through Monday.
Chicago’s thunderstorm and rain threat finally diminishes early Tuesday as a strengthening cold front backed by refreshing Canadian air sweeps through in the morning, with the rest of the holiday rain free and with lowering humidity. Similar pleasant days continue right into next weekend.
-Denis Haller, WGN-TV Meteorologist
WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.
