September weather in St. Marys, GA
The average temperature in St. Marys in September is 77.9°F (71.0°F–84.7°F). Average precipitation: 5.20 inches.
September is a fall month in St. Marys, and is warmer than the annual average of 67.8°F. Daily temperatures swing about 13.7°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 12h 11m. For travel, September is a wet month.
Avg High
84.7°F
Avg Low
71.0°F
Precipitation
5.20 in
Daylight
12h 11m
September records in St. Marys
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.4°F (2020) | 70.5°F (2006) | 1.46 in (2007) |
| September 2 | 93.2°F (2020) | 63.3°F (2011) | 0.91 in (2015) |
| September 3 | 91.6°F (2010) | 65.3°F (2025) | 0.45 in (2022) |
| September 4 | 93.2°F (2020) | 64.0°F (2025) | 1.30 in (2019) |
| September 5 | 93.9°F (2020) | 63.7°F (2023) | 0.66 in (2013) |
| September 6 | 91.9°F (2023) | 65.5°F (2016) | 0.57 in (2015) |
| September 7 | 91.6°F (2023) | 63.9°F (2016) | 3.40 in (2025) |
| September 8 | 92.8°F (2019) | 61.5°F (2011) | 0.47 in (2021) |
| September 9 | 90.0°F (2019) | 59.5°F (2011) | 1.63 in (2020) |
| September 10 | 95.0°F (2010) | 65.7°F (2025) | 7.06 in (2017) |
| September 11 | 92.5°F (2010) | 65.8°F (2025) | 5.36 in (2017) |
| September 12 | 93.6°F (2010) | 64.6°F (2017) | 2.63 in (2009) |
| September 13 | 91.8°F (2013) | 59.4°F (2015) | 1.04 in (2024) |
| September 14 | 93.4°F (2018) | 60.3°F (2015) | 1.12 in (2023) |
| September 15 | 93.6°F (2011) | 61.0°F (2025) | 0.59 in (2024) |
| September 16 | 95.5°F (2018) | 60.8°F (2025) | 2.46 in (2015) |
| September 17 | 92.8°F (2019) | 61.2°F (2025) | 1.13 in (2015) |
| September 18 | 93.4°F (2018) | 64.0°F (2025) | 1.69 in (2019) |
| September 19 | 92.1°F (2018) | 61.7°F (2023) | 2.07 in (2007) |
| September 20 | 90.1°F (2017) | 59.2°F (2006) | 1.50 in (2014) |
| September 21 | 88.3°F (2018) | 58.1°F (2006) | 0.63 in (2023) |
| September 22 | 91.4°F (2022) | 61.9°F (2014) | 1.81 in (2021) |
| September 23 | 88.3°F (2016) | 57.0°F (2020) | 0.34 in (2015) |
| September 24 | 90.9°F (2019) | 55.2°F (2012) | 0.98 in (2013) |
| September 25 | 93.4°F (2019) | 59.2°F (2021) | 1.99 in (2011) |
| September 26 | 94.1°F (2019) | 58.6°F (2021) | 2.67 in (2011) |
| September 27 | 90.0°F (2017) | 60.3°F (2021) | 0.94 in (2010) |
| September 28 | 91.9°F (2018) | 59.0°F (2008) | 2.63 in (2020) |
| September 29 | 90.5°F (2016) | 58.8°F (2009) | 0.91 in (2010) |
| September 30 | 88.0°F (2011) | 54.9°F (2009) | 1.64 in (2017) |