September weather in Chattanooga, TN
The average temperature in Chattanooga in September is 73.9°F (63.6°F–84.3°F). Average precipitation: 4.23 inches.
September is a fall month in Chattanooga, and is warmer than the annual average of 61.9°F. Daily temperatures swing about 20.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
84.3°F
Avg Low
63.6°F
Precipitation
4.23 in
Daylight
12h 12m
September records in Chattanooga
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1951) | 48.9°F (1946) | 2.62 in (1950) |
| September 2 | 100.0°F (2011) | 53.1°F (1954) | 0.70 in (1952) |
| September 3 | 100.0°F (1954) | 51.1°F (1952) | 1.38 in (2003) |
| September 4 | 102.0°F (1954) | 51.1°F (1952) | 2.99 in (1986) |
| September 5 | 102.0°F (1954) | 52.0°F (1952) | 9.49 in (2011) |
| September 6 | 100.9°F (1954) | 53.1°F (1984) | 1.18 in (2021) |
| September 7 | 100.0°F (1954) | 51.1°F (2017) | 6.37 in (1977) |
| September 8 | 99.0°F (1938) | 52.0°F (1953) | 1.01 in (1946) |
| September 9 | 99.0°F (1939) | 48.9°F (1944) | 2.64 in (1997) |
| September 10 | 98.1°F (2019) | 50.0°F (1956) | 2.15 in (1950) |
| September 11 | 96.1°F (2010) | 46.0°F (1940) | 1.83 in (2017) |
| September 12 | 98.1°F (2019) | 39.9°F (1940) | 2.00 in (1965) |
| September 13 | 102.9°F (2019) | 41.0°F (1940) | 3.59 in (1973) |
| September 14 | 98.1°F (1939) | 42.1°F (1953) | 3.92 in (1957) |
| September 15 | 97.0°F (1991) | 46.0°F (1985) | 2.06 in (1977) |
| September 16 | 98.1°F (2019) | 50.0°F (1961) | 5.24 in (2004) |
| September 17 | 100.0°F (2019) | 48.9°F (1984) | 3.01 in (1971) |
| September 18 | 96.1°F (1954) | 46.9°F (1981) | 3.65 in (2012) |
| September 19 | 96.1°F (2010) | 42.1°F (1981) | 2.26 in (2021) |
| September 20 | 96.1°F (2010) | 45.0°F (1981) | 3.37 in (2009) |
| September 21 | 98.1°F (1955) | 44.1°F (1956) | 3.37 in (2009) |
| September 22 | 96.1°F (1940) | 39.9°F (1938) | 2.77 in (2003) |
| September 23 | 96.1°F (2024) | 39.9°F (1982) | 3.59 in (1975) |
| September 24 | 93.9°F (2010) | 41.0°F (1963) | 3.91 in (2020) |
| September 25 | 97.0°F (2016) | 42.1°F (1943) | 1.74 in (2002) |
| September 26 | 96.1°F (2019) | 42.1°F (1940) | 1.82 in (2009) |
| September 27 | 95.0°F (2019) | 37.9°F (1940) | 3.92 in (1979) |
| September 28 | 93.9°F (1954) | 39.0°F (1940) | 1.44 in (1957) |
| September 29 | 95.0°F (2019) | 37.0°F (1942) | 2.24 in (1989) |
| September 30 | 97.0°F (2019) | 36.0°F (1967) | 2.72 in (1954) |