One side effect of hotter weather is more sweat and consequently, oilier hair. But you don't want to necessarily get stuck in a pattern of having to shampoo every single day, since that can dry your hair out. The way you shampoo matters, too. It's also not a good idea to overly scrub your scalp because this increases sebum production, Donovan says. "Initially your hair will feel clean, but the oils will come back super-quick," he says, adding that you should be very gentle when massaging shampoo into your scalp.

If you notice greasy roots, reach for dry shampoo. "It's a good option to absorb oil," Donovan says. Some dry shampoos can be harsh and sticky, so he recommends choosing one that has a lighter formula. We like Batiste Original Clean & Classic Dry Shampoo, $5.99. You can switch to a heavier product the next day if you need more oil absorption, says Donovan.

"Chlorine is extremely bad for your hair," Donovan says. "It really dehydrates hair and can start to affect color, especially if you're on the blonde scale." Before jumping into the pool, wet your hair and apply conditioner or coconut oil, then put your hair in a swim cap, he suggests. These barriers will help prevent chlorine from wreaking too much havoc on your hair. If you don't have a swim cap, tie your hair in a bun at the top of your head so that you can protect the ends from getting wet, Elkhouri says.

"Rinsing off the chlorine immediately after leaving the pool, and before sitting and 'baking' your chlorine-exposed hair in the hot sun, is an effective way to avoid much of the damage caused by chlorine," Elkhouri adds. He also says you should use a sulfate-free detoxifying shampoo to get rid of mineral buildup. He likes Kevin Murphy Maxi Wash, $29.99, which detoxifies and smooths the cuticle with witch hazel extract and provides antioxidant protection with rosemary extract.

"Color fade is a big issue in the summer," Donovan says. Unfortunately, the sun is a notorious hair color fader, which is why using the right products is key. Donovan suggests spritzing on a hair sunscreen before you go outside to protect hair from the sun. Aveda Sun Care Protective Hair Veil, $29, contains UVA and UVB filters. When showering, Donovan advises washing hair in a cooler setting. "The hotter the water, the more the pigments of your hair color will get disturbed."

Finally, Donovan says switching to sulfate-free hair care products can help preserve your hair color in the summer, since sulfates will speed up fading. Try Nexxus Color Assure Shampoo for Colored Hair, $8.39, and Nexxus Color Assure Conditioner for Colored Hair, $16.99.