If you keep regular oils or oils that are thicker, better not to purchase them. This summer, buy the best lightweight ones that will not make your scalp feel oily.
I suggest buying the best conditioner containing sunscreen to shield your hair from harmful UV rays. It is even better if you are going for a swim.
People only prefer hair colouring in winters not in summer because this weather naturally dries mane out and damages them. Do hair colouring before the summer hits.
Do you know what harms the most? When you wash your hair with shampoo all the time. Therefore, buy the mild shampoo and do only on the scalp.
Do you want to repair your hair damage? The only optimal solution is deep conditioning that will also helps hair get suppler.