In Chicago, they're getting their exercise in before it gets too hot...and the temperature IS rising.
SOUNDBITE) (English) UNIDENTIFIED CHICAGO RESIDENT SAYING: "I figured I wanted to get my walk in today.
He has his fan, and lots of water, and lots of sunscreen." And its not just Chicago.
Much of the central and eastern United States can expect hot and muggy conditions over the weekend, with meteorologists forecasting temperatures in the 90s and 100s.
The National weather Service is attributing the scorching weather to a large dome of high pressure.
From Chicago to parts of New England and New York, where Mayor Bill de Blasio is urging the most vulnerable to stay indoors and stay cool.
(SOUNDBITE) (English) NEW YORK CITY MAYOR BILL DE BLASIO SAYING: "We're entering a heat emergency.
It will be extremely hot as I said, potentially dangerous weather this weekend.
If the temperature as predicted could break 100 degrees on Saturday that will make it the hottest day in New York City in the last 7 years." Washington, D.C.
Could see temperatures break 100 degrees this weekend, and in Boston, temperatures could peak at 97.