September weather in Mountain City, TN
The average temperature in Mountain City in September is 64.7°F (52.5°F–76.9°F). Average precipitation: 3.26 inches.
September is a fall month in Mountain City, and is warmer than the annual average of 53.4°F. Daily temperatures swing about 24.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 13m. For travel, September is one of the best months of the year to visit.
Avg High
76.9°F
Avg Low
52.5°F
Precipitation
3.26 in
Daylight
12h 13m
September records in Mountain City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (1973) | 41.0°F (1999) | 2.00 in (2003) |
| September 2 | 90.0°F (1973) | 39.0°F (1958) | 0.72 in (1986) |
| September 3 | 90.0°F (2011) | 37.9°F (1967) | 0.92 in (1957) |
| September 4 | 89.1°F (2019) | 33.1°F (1997) | 0.72 in (1996) |
| September 5 | 93.9°F (1975) | 30.9°F (1997) | 1.67 in (2006) |
| September 6 | 89.1°F (1960) | 37.9°F (1997) | 1.73 in (2012) |
| September 7 | 88.0°F (1998) | 36.0°F (1997) | 1.33 in (1971) |
| September 8 | 87.1°F (1965) | 37.9°F (1988) | 2.07 in (1969) |
| September 9 | 88.0°F (1965) | 34.0°F (1956) | 1.35 in (1967) |
| September 10 | 91.0°F (2019) | 36.0°F (1956) | 1.10 in (2009) |
| September 11 | 91.0°F (1965) | 37.0°F (1969) | 1.00 in (2018) |
| September 12 | 89.1°F (1962) | 36.0°F (1993) | 1.04 in (2022) |
| September 13 | 91.0°F (1962) | 37.0°F (1993) | 1.99 in (1991) |
| September 14 | 91.9°F (1998) | 32.0°F (1975) | 0.75 in (1966) |
| September 15 | 93.9°F (1998) | 32.0°F (1964) | 1.00 in (2007) |
| September 16 | 91.9°F (1998) | 34.0°F (1964) | 2.03 in (1962) |
| September 17 | 88.0°F (1965) | 30.9°F (2000) | 2.00 in (2004) |
| September 18 | 87.1°F (1965) | 33.1°F (2000) | 2.18 in (2012) |
| September 19 | 87.1°F (1991) | 35.1°F (1962) | 0.86 in (1966) |
| September 20 | 88.0°F (2005) | 33.1°F (1996) | 1.10 in (1969) |
| September 21 | 88.0°F (1963) | 28.9°F (1956) | 0.85 in (1958) |
| September 22 | 87.1°F (1970) | 36.0°F (2020) | 1.40 in (1989) |
| September 23 | 90.0°F (1970) | 30.9°F (1963) | 1.64 in (2003) |
| September 24 | 88.0°F (2005) | 33.1°F (1967) | 0.93 in (1965) |
| September 25 | 88.0°F (1970) | 28.0°F (1963) | 1.03 in (2020) |
| September 26 | 87.1°F (1998) | 30.0°F (1964) | 3.86 in (2024) |
| September 27 | 84.9°F (2007) | 32.0°F (1991) | 2.93 in (2024) |
| September 28 | 88.0°F (2019) | 30.9°F (1991) | 1.80 in (1967) |
| September 29 | 87.1°F (2019) | 30.9°F (1969) | 2.26 in (1964) |
| September 30 | 84.9°F (2017) | 28.0°F (1967) | 2.35 in (1959) |