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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.
Average Temperatures for Salt Lake City. Salt Lake City's coldest month is January when the average temperature overnight is 21.3Â°F. In July, the warmest month, the average day time temperature rises to 90.6Â°F.