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The average temperature of Saint George is 56.23Â°F, which is much higher than the Utah average temperature of 49.55Â°F and is higher than the national average temperature of 54.45Â°F.
Weather information for the St George area is provided below. Average temperatures, climate details and current forecasts are included.limate. St. George boasts mild winter temperatures and mostly pleasant temperatures in spring and fall. Summer days are normally blisteringly hot. Rainfall is infrequent and occurs mostly in late summer and early fall. Average high and low temperatures are set out below.