Some people could find no relief from the heat and took their complaints to social media.
"Melting. Way too hot in this place to sleep," tweeted Morgan Sable from Ontario.
Twitter user @annielaa2 in Pennsylvania didn't have air conditioning Wednesday and turned a fan on herself and her cat.
"Getting hot air blown in your face really doesn't help," she tweeted.
From Toronto to Indianapolis, many people chose not to hide indoors in front of the air conditioner and opted for water instead, flocking to beaches, pools, fountains and splash parks.