Winds will increase on Sunday ahead of a strong cold front that'll move in on Sunday evening. Temperatures behind the front on Monday will be much colder and make it feel more like late October than mid-September!
SALT LAKE CITY
Sunday:  Sunny & windy.  SW winds increasing to 20-30 mph.  Highs:  Near 80.
ST. GEORGE
Sunday:  Sunny.  Highs:  Near 90.