September weather in Thornhill, KY
The average temperature in Thornhill in September is 70.4°F (59.9°F–80.9°F). Average precipitation: 3.61 inches.
September is a fall month in Thornhill, and is warmer than the annual average of 57.8°F. Daily temperatures swing about 21°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
80.9°F
Avg Low
59.9°F
Precipitation
3.61 in
Daylight
12h 14m
September records in Thornhill
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2011) | 52.0°F (2025) | 3.23 in (2017) |
| September 2 | 107.1°F (2000) | 55.0°F (2017) | 1.39 in (2000) |
| September 3 | 100.9°F (2011) | 53.1°F (2017) | 1.49 in (2020) |
| September 4 | 96.1°F (2007) | 55.0°F (2025) | 0.48 in (2025) |
| September 5 | 96.1°F (2007) | 50.0°F (2010) | 1.07 in (2021) |
| September 6 | 95.0°F (2015) | 48.9°F (2017) | 0.57 in (2024) |
| September 7 | 95.0°F (2010) | 48.0°F (2017) | 0.95 in (2001) |
| September 8 | 96.1°F (2002) | 46.0°F (2025) | 3.17 in (2018) |
| September 9 | 97.0°F (2002) | 45.0°F (2024) | 1.20 in (2001) |
| September 10 | 98.1°F (2019) | 48.9°F (2024) | 0.67 in (2016) |
| September 11 | 95.0°F (2019) | 36.0°F (2000) | 2.63 in (2014) |
| September 12 | 96.1°F (2019) | 53.1°F (2007) | 1.16 in (2006) |
| September 13 | 96.1°F (2019) | 48.9°F (2015) | 1.29 in (2024) |
| September 14 | 93.0°F (2018) | 48.0°F (2014) | 0.49 in (2003) |
| September 15 | 93.0°F (2010) | 48.9°F (2013) | 1.49 in (2002) |
| September 16 | 95.0°F (2019) | 48.0°F (2000) | 0.05 in (2019) |
| September 17 | 90.0°F (2019) | 44.1°F (2000) | 0.43 in (1949) |
| September 18 | 95.0°F (2008) | 51.1°F (2000) | 0.19 in (2006) |
| September 19 | 93.9°F (2018) | 43.0°F (2012) | 0.68 in (2017) |
| September 20 | 95.0°F (2018) | 46.0°F (2003) | 3.40 in (2009) |
| September 21 | 96.1°F (2010) | 44.1°F (2006) | 0.62 in (2013) |
| September 22 | 96.1°F (2010) | 48.0°F (2012) | 5.29 in (2006) |
| September 23 | 96.1°F (2010) | 41.0°F (2012) | 1.85 in (2006) |
| September 24 | 93.9°F (2010) | 41.0°F (2012) | 2.35 in (2018) |
| September 25 | 91.9°F (2007) | 43.0°F (2001) | 1.24 in (2000) |
| September 26 | 91.0°F (2017) | 39.9°F (2001) | 2.52 in (2002) |
| September 27 | 93.9°F (2019) | 44.1°F (2000) | 2.45 in (2002) |
| September 28 | 95.0°F (2019) | 41.0°F (2022) | 0.65 in (2023) |
| September 29 | 95.0°F (2019) | 43.0°F (2022) | 0.87 in (2015) |
| September 30 | 97.0°F (2019) | 42.1°F (2003) | 0.41 in (2016) |