Most cats have protective fur that keeps them from getting burned by the sun, but Sphynx cats are harmless. That means if they stay out in the sun for too long, they can risk getting burned.
If you have a Sphynx cat, consider using sun block or putting protective clothing on your cat. This will block the sun and keep your cat from getting burned. As a general rule, if the sun is too hot for you, it’s probably too hot for your Sphinx cat as well.