People are in line early just to get in.
"We knew it was going to be warm today, the girls have been really excited about the pool and we just wanted to cool off," said Angie Holmes.
With humidity, it is expected to feel above 100 degrees across central Illinois Friday and Saturday. Holmes and her daughters take precautions when spending the day outside.
"I'm really big into protection from the sun, protecting their skin especially at a young age. So, I just like to make sure they're covered from head to toe," she said.
"We are right around the 500 mark everyday when it is warm out," said Lakeview Family Aquatic Center manager, Shawn Powers.
Powers says swimming can make people think they're doing enough to stay cool.
"Plenty of water around to swim in but they aren't drinking any so they get too hot and complain of headaches. We just pull them out and give them some water," he said. "We keep our staff shaded, as you look you can see them all under umbrellas and out of the sun."
While going out on a hot, sunny day may seem like a good idea, local doctors say if you aren't careful, it could land you in the emergency room.
"It seems like the first really hot day and people aren't accustomed to it," said Dr. Paul Matthews, who works in OSF St. Francis' Emergency Room.
Matthews says the best thing to do is just stay out of the heat if you can.
"Try to stay in air conditioning if you have it at home or if you can at least stay in the shade. If you don't have those options you can use a fan or some cool cloths," said Matthews.
And for those who can't, the Salvation Army is opening its doors.
"There is a population in downtown Peoria that have apartments but don't have air conditioning, so we want to make sure they have an opportunity to beat the head a little bit and and in our case they can grab something to eat while they're here," said Rich Draeger, with the Salvation Army.
After the long, cool spring many like Holmes are glad it is finally warm.
"We're just hoping we can enjoy the pool today and hopefully next week too," she said.