As the sun beat down over the farmer's market in Chestnut Hill, Victor Glenn was loading up on fresh fruit - and he's on the right track.
Fruits with high water content, like watermelon, plums, cantaloupe and apples can help keep you hydrated. The same goes for water-packed veggies like ice cold broccoli, cucumbers and peppers.
"It feels more refreshing than anything heavy or anything hot," said Jodi Inverson of Lawrenceville, New Jersey.
Another tip: Avoid heavy foods, which generate more heat. It's better to stick to less dense foods.
Manny, of "Manny's Place," said his customers were buying "something on the lighter side, fish without a coating."
When it comes to something to drink, should you stick to water or go for the sports drinks? The answer - both! You'll want to make sure you are drinking plenty of water throughout the day but, if you are sweating a lot, you also want to have some sports drink. It's best to dilute it, because anything high in sugar takes longer to absorb.
Which brings us to ice cream. It's always a crowd-pleaser, especially lately here at Poppy's Seed Bakery.
"Sales have been very good for ice cream and gelato, absolutely," said Ron Loux.
But for some, heat and milk are not a good combination. Dairy products can leave you feeling queasy or sluggish, so there dairy-free options, like sorbet.