Tips to protect your hair from sun damage:
Protect your hair from direct exposure to sunlight by wearing a wide brimmed hat or by using an umbrella.
If you must go out; prefer venturing outdoors during early mornings or later in the day when the sunlight is not so strong
Make it a weekly routine to apply a soothing hair mask in order to reduce some of the damage that may have inadvertently been caused
Wash your hair daily with water to remove sweat. Wash your hair 2-3 times in a week with a strengthening/repair shampoo to minimize damage and remove any build-up
Protect your hair with an intense repair and moisturizing conditioner
You could even use a dry shampoo once in a while in order to avoid washing your hair with shampoo every day.
Another way by which you can keep your hair moisturized it by using only conditioner without using any shampoo at all. So, every time you feel like your hair is clean but getting dry, you can wash it with your usual conditioner.
If you must use heat to style your hair, you can avoid damaging it by using a heat protect spray before using straighteners or blow dryers.
For additional protection, you may even choose to use a leave-in conditioner so that your tresses stay hydrated all day long.
Lastly, never forget to cover your hair with a thick scarf while travelling so as to protect it from dust, pollution, and heat. By following these small but significant tit-bits of information, be assured that your hair will have a wonderful summer and with that so shall you!