Our cameras caught video of people dealing with the heat in the Bronx, Yonkers and Newark.
Air quality warnings and advisories are out from Virginia to Connecticut.
Officials urging children and anyone with breathing problems to avoid the outdoors.
And once inside, remember to conserve power and unplug any unnecessary devices.
RELATED: AccuWeather Alert: Heat expected to climb to record highs Monday
If you must go out remember to wear light colored clothing and drink plenty of water.
The National Weather Service said high pressure overhead will bring very high temperatures and humid weather through Thursday. This is the first heat wave since 2013.
As of 11:20 AM today, the temp in Central Park was 90 degrees marking day three of temps at or above 90! First official #HeatWave since 2013— NWS New York NY (@NWSNewYorkNY) August 17, 2015
There will also be an increasing threat of showers and thunderstorms beginning Tuesday.