Let's get this out of the way first: It gets hot in St. George. Really, really hot. We're talking melt the cover off your scriptures hot. So plan your trip accordingly. Spring and Fall are generally wonderful, winter is fine, and summer can be OK, but you need to plan ahead. Plan any outdoor activities for early in the morning, or after the sun goes down. Find air-conditioned places to be during the afternoon. Have a lot of water on hand. And sunscreen.