Author Peggy Toney Horton said an October day is like âyour birthday, Fourth of July and Christmas all rolled into one.â Utahâs weather on this first day of the month seems to match that description. Across the state, temperatures will be warm in the morning and afternoon â though perhaps not firecracker hot â and cool in the evening as a storm system moves in. Salt Lake City will hover around a high of 80 with sunny skies early in the day.