September weather in St. George, UT
The average temperature in St. George in September is 76.5°F (60.7°F–92.4°F). Average precipitation: 0.67 inches.
September is a fall month in St. George, and is warmer than the annual average of 62.7°F. Daily temperatures swing about 31.7°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 12h 13m. For travel, September is hot.
Avg High
92.4°F
Avg Low
60.7°F
Precipitation
0.67 in
Daylight
12h 13m
September records in St. George
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 109.0°F (1995) | 45.0°F (1901) | 1.72 in (2023) |
| September 2 | 109.0°F (2022) | 46.0°F (1902) | 1.75 in (2023) |
| September 3 | 109.9°F (2022) | 43.0°F (1898) | 0.37 in (1918) |
| September 4 | 109.0°F (2022) | 42.1°F (1898) | 0.63 in (1939) |
| September 5 | 109.9°F (2020) | 37.9°F (1912) | 1.27 in (1998) |
| September 6 | 109.9°F (2020) | 39.0°F (1912) | 0.95 in (1916) |
| September 7 | 111.9°F (2022) | 39.0°F (1911) | 0.65 in (1929) |
| September 8 | 108.0°F (2021) | 37.9°F (1911) | 0.69 in (1908) |
| September 9 | 107.1°F (2021) | 41.0°F (1901) | 0.22 in (1924) |
| September 10 | 105.1°F (1968) | 37.9°F (1901) | 0.44 in (1977) |
| September 11 | 106.0°F (1990) | 39.9°F (1916) | 0.40 in (1996) |
| September 12 | 105.1°F (1971) | 36.0°F (1903) | 1.44 in (1939) |
| September 13 | 105.1°F (1971) | 33.1°F (1894) | 0.22 in (1916) |
| September 14 | 104.0°F (1971) | 34.0°F (1894) | 0.58 in (2022) |
| September 15 | 102.9°F (1971) | 36.0°F (1903) | 0.93 in (1997) |
| September 16 | 102.9°F (1928) | 33.1°F (1903) | 0.61 in (1948) |
| September 17 | 104.0°F (1935) | 33.1°F (1903) | 1.05 in (1940) |
| September 18 | 104.0°F (1962) | 34.0°F (1903) | 0.62 in (1963) |
| September 19 | 102.9°F (2000) | 33.1°F (1900) | 1.63 in (1972) |
| September 20 | 102.9°F (2000) | 33.1°F (1900) | 0.25 in (1952) |
| September 21 | 102.9°F (2000) | 25.0°F (1895) | 0.69 in (1967) |
| September 22 | 102.9°F (2000) | 30.9°F (1895) | 0.60 in (1918) |
| September 23 | 100.9°F (1966) | 28.9°F (1895) | 1.32 in (2007) |
| September 24 | 100.0°F (1928) | 30.9°F (1916) | 0.63 in (1967) |
| September 25 | 102.9°F (1947) | 30.9°F (1901) | 0.68 in (1909) |
| September 26 | 100.0°F (1969) | 33.1°F (1912) | 1.26 in (1909) |
| September 27 | 102.0°F (1942) | 32.0°F (1896) | 0.40 in (1982) |
| September 28 | 102.0°F (2024) | 30.9°F (1900) | 1.08 in (1951) |
| September 29 | 104.0°F (2024) | 30.9°F (1900) | 0.67 in (1911) |
| September 30 | 100.9°F (2024) | 32.0°F (1900) | 1.01 in (1911) |