Doctors are warning about the toll heat can take on your health. Heat stroke happens when your body temperature can rise so quickly it's unable to cool down.

Doctors say it's important to drink eight ounces of water every 15 to 20 minutes and drink electrolytes, like Gatorade, in between.

People at Seaside Park were trying to beat the heat by getting some shade.

"I have my water jug filled up. I'm good," said Jerry Newbauer. "I went down to the pier. I walked a couple hundred yards but I have my chair set up down in the shade over there," said Newbauer.

Doctors say in this heat, dehydration can set in first, something Dr. Syed Hussain at Hartford HealthCare in Shelton says he's already seeing from his patients.

Safety tips: Know the signs of heat exhaustion and heat stroke

"They came in feeling fatigued, tired and I did all the tests and I found out they were actually dehydrated," said Hussain.

Hussain says that's when heat exhaustion can set in.

"The sweating takes the sodium and potassium out of your system and you feel exhausted. Muscle cramps, which is one of the symptoms of heat illness sets in," said Hussain.

He says the next step is the most serious heat-related illness, heat stroke.

"It’s one of those symptoms that can progressively lead to kidney disease, kidney failure because dehydration is so far in advance," said Hussain.

Doctors say if you are going to be out in this heat to take breaks and try and adjust your schedule earlier or later in the day.

Hussain says this heat can also bring on a urinary tract infection because of the concentration in your urine, basically from not drinking enough water.

Doctors say heat stroke can cause permanent disability or death if not treated.