September weather in Sinclair, WY
The average temperature in Sinclair in September is 56.5°F (40.7°F–72.3°F). Average precipitation: 0.89 inches.
September is a fall month in Sinclair, and is warmer than the annual average of 43.1°F. Daily temperatures swing about 31.6°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
72.3°F
Avg Low
40.7°F
Precipitation
0.89 in
Daylight
12h 16m
September records in Sinclair
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.0°F (1995) | 30.0°F (2005) | 0.53 in (2008) |
| September 2 | 93.0°F (2019) | 33.1°F (1961) | 0.37 in (1961) |
| September 3 | 91.0°F (1998) | 28.9°F (1974) | 0.48 in (1999) |
| September 4 | 95.0°F (1998) | 30.9°F (1953) | 0.26 in (1999) |
| September 5 | 93.0°F (1998) | 32.0°F (1953) | 0.56 in (1972) |
| September 6 | 93.0°F (2022) | 28.9°F (1956) | 0.72 in (1970) |
| September 7 | 93.0°F (2022) | 25.0°F (2010) | 0.58 in (1971) |
| September 8 | 88.0°F (1997) | 24.1°F (1962) | 0.57 in (1989) |
| September 9 | 88.0°F (2021) | 19.0°F (1962) | 0.26 in (2003) |
| September 10 | 90.0°F (1996) | 25.2°F (2016) | 0.67 in (2008) |
| September 11 | 84.9°F (1958) | 27.0°F (1957) | 0.68 in (1973) |
| September 12 | 87.1°F (1990) | 25.0°F (1974) | 0.35 in (1988) |
| September 13 | 86.0°F (1990) | 23.0°F (1974) | 0.84 in (1982) |
| September 14 | 86.0°F (1990) | 21.9°F (1993) | 0.68 in (2013) |
| September 15 | 91.0°F (2000) | 27.0°F (1979) | 0.60 in (2006) |
| September 16 | 91.0°F (2000) | 19.0°F (1965) | 2.06 in (1965) |
| September 17 | 86.0°F (1998) | 17.1°F (1965) | 0.72 in (1965) |
| September 18 | 82.9°F (2018) | 17.1°F (1965) | 0.36 in (1989) |
| September 19 | 86.0°F (2010) | 24.1°F (1965) | 0.36 in (1997) |
| September 20 | 82.9°F (2016) | 12.9°F (1965) | 0.30 in (2004) |
| September 21 | 80.1°F (1966) | 19.9°F (1995) | 0.54 in (1963) |
| September 22 | 82.0°F (1966) | 21.0°F (1957) | 0.69 in (2025) |
| September 23 | 82.0°F (2015) | 23.0°F (2000) | 0.30 in (2000) |
| September 24 | 82.0°F (2001) | 21.0°F (1965) | 0.27 in (1986) |
| September 25 | 84.0°F (2024) | 18.0°F (2000) | 0.45 in (1986) |
| September 26 | 84.0°F (2024) | 18.0°F (1996) | 0.19 in (1979) |
| September 27 | 82.9°F (2024) | 16.0°F (1996) | 0.51 in (1972) |
| September 28 | 86.0°F (2024) | 19.0°F (1985) | 0.22 in (2015) |
| September 29 | 84.9°F (2024) | 16.0°F (1984) | 0.52 in (1961) |
| September 30 | 80.1°F (2010) | 8.1°F (1985) | 0.64 in (2007) |