September weather in Williston, SC
The average temperature in Williston in September is 74.4°F (64.4°F–84.4°F). Average precipitation: 4.81 inches.
September is a fall month in Williston, and is warmer than the annual average of 63.9°F. Daily temperatures swing about 20°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
84.4°F
Avg Low
64.4°F
Precipitation
4.81 in
Daylight
12h 12m
September records in Williston
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.5°F (2014) | 59.4°F (2025) | 0.65 in (2008) |
| September 2 | 94.6°F (2020) | 58.8°F (2025) | 7.87 in (2016) |
| September 3 | 94.6°F (2010) | 56.3°F (2023) | 0.39 in (2012) |
| September 4 | 96.1°F (2020) | 55.9°F (2021) | 1.29 in (2022) |
| September 5 | 92.7°F (2025) | 55.8°F (2010) | 0.81 in (2011) |
| September 6 | 93.9°F (2019) | 58.3°F (2010) | 0.82 in (2004) |
| September 7 | 95.9°F (2019) | 56.5°F (2011) | 1.49 in (2003) |
| September 8 | 97.2°F (2019) | 54.1°F (2011) | 0.43 in (2015) |
| September 9 | 97.0°F (2019) | 56.5°F (2017) | 0.40 in (2009) |
| September 10 | 93.6°F (2002) | 55.2°F (2011) | 1.00 in (2015) |
| September 11 | 95.7°F (2002) | 56.7°F (2021) | 6.08 in (2017) |
| September 12 | 93.9°F (2019) | 57.4°F (2012) | 2.50 in (2023) |
| September 13 | 93.4°F (2019) | 56.1°F (2015) | 1.75 in (2006) |
| September 14 | 90.7°F (2011) | 52.3°F (2015) | 0.57 in (2014) |
| September 15 | 93.7°F (2005) | 52.2°F (2015) | 1.46 in (2014) |
| September 16 | 95.0°F (2005) | 56.7°F (2011) | 1.16 in (2021) |
| September 17 | 95.9°F (2019) | 55.6°F (2011) | 3.16 in (2020) |
| September 18 | 95.0°F (2005) | 57.2°F (2007) | 0.80 in (2009) |
| September 19 | 93.6°F (2005) | 55.4°F (2013) | 0.84 in (2014) |
| September 20 | 94.8°F (2010) | 53.8°F (2004) | 1.05 in (2009) |
| September 21 | 95.2°F (2010) | 53.2°F (2020) | 2.48 in (2011) |
| September 22 | 95.9°F (2022) | 49.6°F (2020) | 0.52 in (2011) |
| September 23 | 93.7°F (2024) | 50.9°F (2020) | 1.07 in (2002) |
| September 24 | 94.1°F (2025) | 46.8°F (2022) | 2.21 in (2015) |
| September 25 | 96.6°F (2019) | 50.9°F (2021) | 0.54 in (2020) |
| September 26 | 96.4°F (2019) | 50.2°F (2012) | 2.80 in (2024) |
| September 27 | 94.8°F (2019) | 54.3°F (2022) | 2.57 in (2004) |
| September 28 | 92.5°F (2019) | 54.0°F (2013) | 0.10 in (2020) |
| September 29 | 94.5°F (2019) | 46.8°F (2003) | 1.04 in (2020) |
| September 30 | 96.1°F (2019) | 46.0°F (2006) | 0.50 in (2022) |