Look for an SPF spray made for hair. If you can't find an SPF or you're in a pinch, you can use a sunscreen made for your skin. Mix half a cup of water with half a teaspoon of SPF 20 or 30 sunblock in a water spray bottle, shake well and mist hair before styling. You can also use undiluted sunblock on your centre parting. If the sunscreen is too messy for you, you can use lip balm with the highest SPF you can find. Use a deep cleansing shampoo to remove the sunscreen from your hair.
If you use a styling product with SPF protection, keep in mind that most of them contain alcohol, which can dry your hair out faster than the sun. You can also try using coconut, jojoba, sunflower or olive oil in your hair. Simply apply the oil to your hair before going into the sun. The heat from the sun will help the oil to penetrate your hair shaft, conditioning and repairing your hair before it becomes dry and brittle.
Wear a hat or bandana to protect your hair colour from the sun's rays. Another great option is putting your hair into a French twist or bun when the sun is at its hottest, as this will protect the delicate scalp at the top of your head.