EXCESSIVE HEAT WARNINGS are in effect through 8 PM Saturday.
In many major population centres, the heat index - how hot it feels factoring in the humidity - is forecast to peak around 110 degrees between Friday and Sunday.
Cleveland.com's David Petkiewicz compiled a list of activities you can do while staying out of the heat. Avoid caffeine and alcohol, which can contribute to dehydration.
Never leave anyone, including pets, in a closed, parked vehicle, as temperatures inside can reach over 150 degrees quickly, resulting in heat stroke and death.More news: US Patriot battery reportedly to deploy to Saudi Arabia
"Our city departments are working around the clock conducting well-being checks and outreach to ensure our most vulnerable residents have access to facilities that provide relief from the extreme heat", Lightfoot said.
If you lack air conditioning, stay on your lowest floor, out of the sun. Wearing loose-fitting, light-colored clothing can help, too; the looseness allows air to circulate around the body, and light colors reflect sunlight. Dark colors absorb the sun's rays.
Stay in the shade as much as possible, and wear a large hat or carry a parasol.
The weather service said to take extra precautions if you spend time outside. Ensure pets have adequate drinking water and a shady place to rest, or bring them inside.
Above all, be aware of your body.More news: China calls on US to 'correct' Iran sanctions
Health professionals say prolonged exposure to heat and humidity will increase the risk of heat-related illnesses.
Most vulnerable groups to heat-related illnesses include the elderly, chronically ill, children, and outdoor workers. The eldery, young children and people with medical conditions are especially at risk during the risky heat wave.More news: Heat warning in effect for Friday and Saturday