So what do folks in the D.C. area do differently on a day when the heat index is dangerously high and the scorching sun seems to show no mercy?
Drink water. Lots of it.
Popular hangouts like outdoor dining patios and sandy spots are deserted.
Paddle boats on the Potomac will more than likely sit dormant all day. A jogger is making sure to go out super early. But even in the early morning hours, he's covered in sweat.
"It's hard, lot of times you run half the distance and you have to walk," says jogger Todd Wilkas.
On a day when it's supposed to feel like 105 degrees, there's not much of a reprieve in the shade or even in the water. A Heat Advisory covering the majority of the Washington area will go into effect Thursday afternoon.
One air conditioning technician has been busy in the area, going door to door making sure everyone's unit is working the way it should.
The Appel family visiting from California is not only happy to have air conditioning in their National Harbor hotel, but also water. Steve Appel says they'll cool off by pouring water on their heads.
On the other hand, try being Michael Cummings.
"My blower for my central air conditioning unit went out," he says.
It hasn't been working the entire heat wave, and Cummings observes that it is actually cooler outside than it is in his living room -- which feels like it's about 95 degrees.
Michael says money is tight and he can't get his AC fixed right now, so he's throwing open the windows, using fans, and trying to stay positive.
"We're very fortunate to have a front porch and a back porch, so it's been tolerable," he says.
On 8th Street Southeast, a lot of people were heading inside restaurants on Thursday night, but outdoor seating was about as popular as a frozen drink -- in January.
And in Southwest, a park playground, tennis courts, a ball field were empty.
It's no wonder -- they were all at the pool.