Chicago is preparing for a sharp temperature decline this Sunday, following an unseasonably warm Saturday where temperatures soared into the 70s and 80s °F. CBS News reports that the city will transition from these mild conditions to considerably cooler temperatures as the day unfolds. Meteorologist Kylee Miller notes that this shift will bring the region back to weather patterns more typical of March. The warm spell allowed many Chicagoans to relish outdoor activities, but residents should brace themselves for a stark contrast. The anticipated temperature decrease may impact various outdoor plans, and individuals are advised to dress appropriately to remain comfortable and healthy. The change in weather conditions could also lead to potential disruptions in travel, especially at O'Hare International Airport.