September weather in St. Marys, WV
The average temperature in St. Marys in September is 66.5°F (55.1°F–77.9°F). Average precipitation: 3.30 inches.
September is a fall month in St. Marys, and is warmer than the annual average of 53.1°F. Daily temperatures swing about 22.8°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
77.9°F
Avg Low
55.1°F
Precipitation
3.30 in
Daylight
12h 15m
September records in St. Marys
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (2012) | 46.9°F (2009) | 0.88 in (2001) |
| September 2 | 90.0°F (2010) | 48.9°F (1994) | 1.45 in (2012) |
| September 3 | 91.9°F (2010) | 48.0°F (1994) | 1.07 in (2012) |
| September 4 | 93.9°F (2002) | 44.1°F (1997) | 1.09 in (1988) |
| September 5 | 93.0°F (2018) | 43.0°F (1997) | 1.14 in (1991) |
| September 6 | 91.0°F (2018) | 46.0°F (2010) | 1.35 in (2011) |
| September 7 | 96.1°F (1998) | 45.0°F (1988) | 2.10 in (1996) |
| September 8 | 93.9°F (2016) | 46.0°F (1988) | 0.61 in (2012) |
| September 9 | 93.0°F (2002) | 46.0°F (1998) | 3.99 in (2004) |
| September 10 | 93.9°F (2002) | 46.0°F (1998) | 2.82 in (2018) |
| September 11 | 93.0°F (2002) | 43.0°F (2010) | 1.03 in (1989) |
| September 12 | 90.0°F (2019) | 43.0°F (1993) | 0.36 in (1986) |
| September 13 | 91.0°F (2019) | 46.0°F (2002) | 1.30 in (1988) |
| September 14 | 91.9°F (2019) | 46.0°F (2002) | 0.72 in (1991) |
| September 15 | 91.9°F (1998) | 45.0°F (2001) | 0.94 in (1990) |
| September 16 | 91.0°F (1998) | 42.1°F (2007) | 2.43 in (1989) |
| September 17 | 90.0°F (1991) | 41.0°F (2000) | 1.82 in (1996) |
| September 18 | 84.9°F (2021) | 42.1°F (2000) | 3.45 in (2004) |
| September 19 | 86.0°F (1991) | 41.0°F (2020) | 2.18 in (2003) |
| September 20 | 88.0°F (2002) | 39.0°F (2020) | 0.92 in (2022) |
| September 21 | 91.9°F (2002) | 39.0°F (2020) | 0.83 in (2000) |
| September 22 | 88.0°F (2018) | 39.0°F (1999) | 0.68 in (1998) |
| September 23 | 90.0°F (2019) | 36.0°F (1995) | 1.85 in (1989) |
| September 24 | 91.0°F (2016) | 37.0°F (1989) | 1.09 in (2000) |
| September 25 | 91.9°F (2007) | 37.0°F (1989) | 1.10 in (1991) |
| September 26 | 93.9°F (2007) | 39.9°F (1990) | 1.20 in (2000) |
| September 27 | 89.1°F (1998) | 37.9°F (1991) | 1.74 in (2002) |
| September 28 | 89.1°F (1998) | 39.0°F (1989) | 0.49 in (2015) |
| September 29 | 86.0°F (2019) | 39.0°F (1989) | 1.35 in (1996) |
| September 30 | 84.0°F (1999) | 37.9°F (1992) | 2.30 in (2015) |