The trout would need to have it spring fed. They need cold water constantly during all times of the year.
Trout are cold water fish that require a very high oxygen content. The colder the water, the more oxygen it contains.

I would measure the temperature of the water during the hot summer months. Even though the temp may be 80 at the surface, if the temp is between 50-55 near the bottom, most trout will do fine.

Good Luck!