September weather in Star Valley Ranch, WY
The average temperature in Star Valley Ranch in September is 52.4°F (34.4°F–70.3°F). Average precipitation: 1.70 inches.
September is a fall month in Star Valley Ranch, and is warmer than the annual average of 38.6°F. Daily temperatures swing about 35.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 17m. For travel, September is cool.
Avg High
70.3°F
Avg Low
34.4°F
Precipitation
1.70 in
Daylight
12h 17m
September records in Star Valley Ranch
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 88.0°F (2022) | 21.9°F (1975) | 0.61 in (1985) |
| September 2 | 88.0°F (2019) | 25.0°F (1999) | 0.66 in (2004) |
| September 3 | 89.1°F (2022) | 27.0°F (1975) | 0.86 in (1999) |
| September 4 | 93.0°F (2022) | 27.0°F (1989) | 0.91 in (2007) |
| September 5 | 90.0°F (2022) | 26.1°F (2010) | 0.70 in (1992) |
| September 6 | 90.0°F (2020) | 17.1°F (1999) | 0.96 in (2002) |
| September 7 | 90.0°F (2022) | 16.0°F (1999) | 0.52 in (1991) |
| September 8 | 91.9°F (2022) | 17.1°F (1999) | 0.95 in (1983) |
| September 9 | 90.0°F (2021) | 21.9°F (2020) | 0.80 in (1986) |
| September 10 | 84.0°F (2013) | 23.0°F (2020) | 0.83 in (1984) |
| September 11 | 84.0°F (1990) | 6.1°F (1999) | 0.99 in (1984) |
| September 12 | 84.0°F (1990) | 10.0°F (1999) | 0.78 in (1998) |
| September 13 | 84.0°F (2022) | 21.9°F (2014) | 0.44 in (2016) |
| September 14 | 84.9°F (1990) | 23.0°F (1993) | 0.33 in (2006) |
| September 15 | 84.9°F (2000) | 27.0°F (2004) | 1.11 in (2017) |
| September 16 | 84.0°F (2020) | 24.1°F (1987) | 0.90 in (2017) |
| September 17 | 81.0°F (1979) | 19.9°F (1988) | 0.78 in (2002) |
| September 18 | 82.9°F (1979) | 19.9°F (1988) | 0.79 in (1978) |
| September 19 | 81.0°F (2014) | 12.0°F (1983) | 0.98 in (1990) |
| September 20 | 78.1°F (2018) | 12.0°F (1983) | 0.84 in (1985) |
| September 21 | 80.1°F (1981) | 19.9°F (1975) | 0.78 in (2006) |
| September 22 | 82.0°F (2001) | 19.9°F (1996) | 0.54 in (2016) |
| September 23 | 82.9°F (1987) | 19.9°F (1996) | 0.85 in (2016) |
| September 24 | 82.9°F (1987) | 23.0°F (2000) | 0.95 in (2016) |
| September 25 | 82.0°F (2001) | 19.0°F (1996) | 0.87 in (1998) |
| September 26 | 82.9°F (2015) | 19.9°F (1986) | 1.07 in (1982) |
| September 27 | 82.0°F (2024) | 10.0°F (1999) | 0.66 in (1983) |
| September 28 | 82.9°F (2010) | 15.1°F (1985) | 0.47 in (2019) |
| September 29 | 84.0°F (2024) | 16.0°F (1985) | 1.47 in (2019) |
| September 30 | 82.9°F (1996) | 21.0°F (1985) | 0.85 in (1989) |