Sierra Vista offers much cooler days than Phoenix and Tucson’s sweltering weather. Often Sierra Vista is 10 to 14 degrees cooler than Phoenix and 9 to 10 degrees cooler than Tucson. Because of the higher elevation, 4,623 feet, Sierra Vista’s average high temperature is about 77 degrees, while it dips to an average low of 49 degrees. Sierra Vista also avoids lasting freezes, though snow often dusts the Huachuca Mountains in the winter. With an average of 284 sunny days each year and low humidity, Sierra Vista’s climate is ideal for your vacation destination.