Southern Utah is a mild, temperate climate. Winter months has the overnight temperature dropping into the 20's on the Fahrenheit Scale but back up to the 60's by afternoon.
Spring will provide the occasional random, and quick, rain shower. Daily highs can be in the 70's and 80's with cooler mornings.
Summer temperatures will peak at just over 100 degrees. Depending on elevation you will still want to bring a coat. We are in the Northern most corner of the Mojave Desert, it can still get cold at night.
Southern Utah experiences over 300 days of sunshine every year. With low humidity we experience mild winters and briefly hot summers.
It is best to drink plenty of water and use your sunscreen. The elevation of the area ranges from 2,800 feet to over 10,000 feet.