General:
* Chapeau d'été (literally "summer hat") - This is the most straightforward translation.
* Chapeau pour l'été (literally "hat for summer") - Another general option.
Specific Types:
* Chapeau de paille (straw hat) - This is a very common type of summer hat.
* Casquette (cap) - Good for baseball caps, trucker hats, etc.
* Bob (bucket hat) - Popular in recent years.
* Panama (Panama hat) - A classic summer hat.
Other Options:
* Chapeau léger (light hat) - Focuses on the hat being suitable for warm weather.
* Chapeau de soleil (sun hat) - Emphasizes the hat's purpose.
The best translation will depend on the context and the specific type of summer hat you're referring to.