September weather in Harriman, TN
The average temperature in Harriman in September is 71.5°F (61.0°F–82.1°F). Average precipitation: 4.27 inches.
September is a fall month in Harriman, and is warmer than the annual average of 58.4°F. Daily temperatures swing about 21.1°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 13m. For travel, September is a comfortable month to visit.
Avg High
82.1°F
Avg Low
61.0°F
Precipitation
4.27 in
Daylight
12h 13m
September records in Harriman
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2024) | 59.0°F (2025) | 2.91 in (2021) |
| September 2 | 97.0°F (2011) | 59.0°F (2017) | 1.14 in (1950) |
| September 3 | 99.0°F (2011) | 57.0°F (2017) | 4.65 in (1898) |
| September 4 | 99.0°F (2011) | 54.0°F (2010) | 3.96 in (1988) |
| September 5 | 95.0°F (2007) | 51.1°F (2010) | 1.30 in (1915) |
| September 6 | 96.1°F (2007) | 52.0°F (2010) | 5.35 in (2011) |
| September 7 | 93.0°F (2007) | 48.9°F (2017) | 1.48 in (1890) |
| September 8 | 93.9°F (2010) | 48.9°F (2017) | 1.75 in (2004) |
| September 9 | 93.9°F (2016) | 50.0°F (2024) | 1.53 in (1970) |
| September 10 | 93.9°F (2002) | 51.1°F (2024) | 2.04 in (1909) |
| September 11 | 95.0°F (2019) | 53.1°F (2024) | 2.02 in (1907) |
| September 12 | 93.0°F (2019) | 54.0°F (2025) | 2.31 in (2010) |
| September 13 | 93.9°F (2019) | 51.1°F (2015) | 2.20 in (1929) |
| September 14 | 96.1°F (2019) | 48.0°F (2015) | 2.23 in (1925) |
| September 15 | 91.9°F (2018) | 48.9°F (2015) | 1.50 in (1957) |
| September 16 | 91.9°F (2016) | 48.0°F (2000) | 1.73 in (1962) |
| September 17 | 93.0°F (2019) | 45.0°F (2000) | 3.24 in (2004) |
| September 18 | 93.9°F (2019) | 45.0°F (2000) | 5.70 in (2012) |
| September 19 | 91.0°F (2019) | 48.9°F (2012) | 1.33 in (1992) |
| September 20 | 91.0°F (2018) | 50.0°F (2004) | 2.61 in (1969) |
| September 21 | 93.0°F (2024) | 45.0°F (2006) | 2.33 in (1958) |
| September 22 | 95.0°F (2024) | 45.0°F (2006) | 3.15 in (1924) |
| September 23 | 91.0°F (2016) | 48.9°F (2020) | 3.35 in (2003) |
| September 24 | 93.0°F (2007) | 44.1°F (2012) | 2.87 in (2006) |
| September 25 | 93.0°F (2007) | 44.1°F (2012) | 1.98 in (1991) |
| September 26 | 93.0°F (2016) | 39.9°F (2001) | 2.20 in (2018) |
| September 27 | 89.1°F (2007) | 41.0°F (2001) | 2.75 in (2018) |
| September 28 | 90.0°F (2019) | 44.1°F (2001) | 2.26 in (1917) |
| September 29 | 90.0°F (2019) | 39.9°F (2003) | 2.74 in (1944) |
| September 30 | 91.0°F (2019) | 42.1°F (2003) | 4.84 in (1944) |