As soon as you step out of shower your hair is back in battle zone again with humidity. Frizzy hair is something I used to struggle with during warm weather. It makes me want to jump into the shower every couple of hours because it's frizzy and sticky due to the heat. if you're currently struggling with frizzy hair, you might need to make some tweaks to your hair care routine.
Because, who wants to wake up with hair like this...
Summer Hair Care Routine
Drying method: Don't use a cotton towel to dry your hair and never rub it! Instead use a microfiber or cotton t-shirt to dry your hair by gently blotting away excess water out.
Lather every one or two days: Shampooing sounds like it will refresh your hair, but it can also dry out your hair. The natural oils that accumulate are actually great frizz-fighters. If your hair feels oily use dry shampoo.
DIY hair rinse: If you have curly hair your strands might be more prone to frizz.  Use a carbonated drink like Perrier's Sparkling water to give your hair a final rinse after your regular shampoo + conditioner.  Mix equal portion of apple cider vinegar and water. Then use it with the similar method as solution 1.
The oil method: Make an oil treatment with either coconut oil or olive oil. Heat up one cup of either oil in a glass jar. Evenly distribute the mixture on your hair and throw on a cap and wrap a hot towel around your head to increase moisture absorption. Let it sit for 30 minutes. Then shampoo and rinse your hair with cold water.
Okay, now that you got down all the tricks. It's time to say farewell to frizzy hair. Like finally.