Rafael Ocampo bikes through a sprinkler in Liberty Park at sunset, enjoying the spray of cooling droplets. As September starts, Utahns can look forward to the end of summer and the beginning of moderate weather. When will the month's hot temperatures break? Not in the next few days, says William J. Alder, meteorologist in charge of the National Weather Service regional forecast center. "It's going to stay in the 90s." Salt Lake City's earliest recorded snow was on Sept. 17, 1965, when 2.2 inches fell. The earliest frost - that is, when temperatures dipped to freezing - was on Sept. 13, 1928.