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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.
Saint George's Yearly Weather Summary. Saint George weather usually remains sunny with 80-to 85 degree temperature year round. There are mainly two seasons, dry and rainy. The 'dry' season starts from January and lasts until May while the 'rainy' season lasts for the rest of the year; it is the hurricane season as well.aint George weather usually remains sunny with 80-to 85 degree temperature year round. There are mainly two seasons, dry and rainy.