This will only make the problems worse in the long run. Be religious about your trims. Since summer heat can be so pump up the frizzies, make sure you have the ends trimmed every 6-8 weeks during the summer months. When your ends are fizzy, its a sure sign that they are either damaged, split or both. Wear a hat at the beach, in your convertible or out in the hot sun.
Hair can get sunburnt just like the scalp.
The only way to severely burnt hair is by trimming. Prevention is the safest plan. Frizzy hair is often the result of too much sun time. Hanging out in the sun without protection for your hair and scalp is the worst thing you can do. Use leave in hair products with SPF protection when you know you will be at the beach is you are unwilling to wear a hat or a cover-up.