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Families turned out on the first day that Chicago Park District pools opened. Others had a splash at the Crown Fountain in Millennium Park. The city could reach 90 degrees for seven straight days, with very little cool down overnight.
The last time Chicago saw a seven-day streak of low temperatures above 70 degrees was in 1933, just months after Franklin D. Roosevelt was first sworn in as president, and Chicago was hosting its last world's fair.
Some fans fought back during a weather-related evacuation at SeatGeek Stadium in Bridgeview outside Chicago.
A week of high temperatures arrives as the Chicago Park District opens all 77 public pools for the season. The city is offering six cooling centers where those who could be vulnerable to the heat can seek relief.