September weather in Star Valley, AZ
The average temperature in Star Valley in September is 68.9°F (51.9°F–85.9°F). Average precipitation: 1.54 inches.
September is a fall month in Star Valley, and is warmer than the annual average of 57°F. Daily temperatures swing about 34°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
85.9°F
Avg Low
51.9°F
Precipitation
1.54 in
Daylight
12h 12m
September records in Star Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1950) | 36.0°F (1956) | 1.39 in (2021) |
| September 2 | 102.9°F (1948) | 43.0°F (1953) | 0.45 in (1996) |
| September 3 | 100.9°F (1948) | 41.0°F (1964) | 0.72 in (1974) |
| September 4 | 99.0°F (1952) | 37.0°F (1961) | 0.64 in (2006) |
| September 5 | 99.0°F (1952) | 39.9°F (1961) | 5.36 in (1970) |
| September 6 | 98.1°F (1979) | 43.0°F (1985) | 1.09 in (1970) |
| September 7 | 99.0°F (2020) | 43.0°F (1966) | 0.52 in (2002) |
| September 8 | 96.1°F (1997) | 44.1°F (1974) | 0.91 in (2014) |
| September 9 | 96.1°F (1990) | 39.9°F (1989) | 1.99 in (2013) |
| September 10 | 97.0°F (1990) | 42.1°F (2020) | 1.60 in (1984) |
| September 11 | 97.0°F (1990) | 39.9°F (1986) | 1.20 in (1984) |
| September 12 | 95.0°F (1971) | 33.1°F (1985) | 1.06 in (1958) |
| September 13 | 97.0°F (2000) | 34.0°F (1976) | 1.24 in (1964) |
| September 14 | 99.0°F (2000) | 39.9°F (1986) | 1.19 in (1966) |
| September 15 | 96.1°F (1956) | 39.0°F (1970) | 1.34 in (1999) |
| September 16 | 98.1°F (1956) | 36.0°F (1970) | 0.41 in (1948) |
| September 17 | 99.0°F (1956) | 36.0°F (1970) | 0.76 in (1971) |
| September 18 | 98.1°F (1956) | 36.0°F (1957) | 1.67 in (1985) |
| September 19 | 96.1°F (1956) | 37.0°F (1957) | 2.36 in (2004) |
| September 20 | 93.9°F (1980) | 34.0°F (1965) | 0.89 in (2004) |
| September 21 | 96.1°F (1980) | 33.1°F (1955) | 1.39 in (1952) |
| September 22 | 93.0°F (1989) | 36.0°F (1955) | 1.22 in (2025) |
| September 23 | 93.9°F (2002) | 33.1°F (1970) | 1.17 in (2019) |
| September 24 | 93.0°F (2015) | 35.1°F (2017) | 1.05 in (1954) |
| September 25 | 93.9°F (1980) | 36.0°F (1970) | 1.44 in (1964) |
| September 26 | 93.9°F (1956) | 37.0°F (1959) | 1.38 in (1984) |
| September 27 | 95.0°F (2024) | 36.0°F (1955) | 1.85 in (1958) |
| September 28 | 95.0°F (2024) | 35.1°F (2013) | 0.85 in (1995) |
| September 29 | 93.9°F (2024) | 33.1°F (1982) | 2.20 in (1983) |
| September 30 | 93.9°F (2000) | 36.0°F (1955) | 1.61 in (1983) |