September weather in Austin, TX
The average temperature in Austin in September is 80.8°F (70.1°F–91.4°F). Average precipitation: 3.45 inches.
September is a fall month in Austin, and is warmer than the annual average of 70°F. Daily temperatures swing about 21.3°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 10m. For travel, September is hot.
Avg High
91.4°F
Avg Low
70.1°F
Precipitation
3.45 in
Daylight
12h 10m
September records in Austin
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 107.1°F (2000) | 62.1°F (1944) | 2.51 in (1946) |
| September 2 | 107.1°F (2000) | 66.9°F (1967) | 3.55 in (2010) |
| September 3 | 108.0°F (2000) | 59.0°F (1974) | 1.89 in (1942) |
| September 4 | 109.9°F (2000) | 57.9°F (1974) | 1.48 in (2009) |
| September 5 | 111.9°F (2000) | 55.9°F (1974) | 0.91 in (1938) |
| September 6 | 102.9°F (2019) | 57.0°F (1974) | 3.90 in (1944) |
| September 7 | 105.1°F (2023) | 57.0°F (2017) | 7.04 in (2010) |
| September 8 | 107.1°F (2023) | 59.0°F (1957) | 3.17 in (1994) |
| September 9 | 104.0°F (2023) | 55.9°F (1957) | 3.22 in (1949) |
| September 10 | 100.9°F (1940) | 57.9°F (2020) | 2.93 in (1987) |
| September 11 | 104.0°F (2011) | 61.0°F (1968) | 2.35 in (1998) |
| September 12 | 105.1°F (2011) | 55.9°F (1940) | 2.11 in (2009) |
| September 13 | 105.1°F (2011) | 55.0°F (1940) | 2.02 in (1951) |
| September 14 | 102.9°F (2011) | 55.0°F (1945) | 1.43 in (1985) |
| September 15 | 100.0°F (2024) | 55.0°F (1945) | 2.02 in (1998) |
| September 16 | 100.9°F (2019) | 54.0°F (1945) | 2.73 in (1964) |
| September 17 | 99.0°F (2021) | 55.0°F (1961) | 0.83 in (1952) |
| September 18 | 100.9°F (2019) | 54.0°F (1968) | 3.66 in (2014) |
| September 19 | 100.9°F (1956) | 52.0°F (1981) | 1.40 in (1977) |
| September 20 | 102.9°F (1956) | 52.0°F (1971) | 2.92 in (2013) |
| September 21 | 99.0°F (2005) | 53.1°F (1938) | 1.27 in (1967) |
| September 22 | 100.9°F (2005) | 48.9°F (1983) | 4.00 in (1965) |
| September 23 | 100.9°F (2023) | 52.0°F (1983) | 2.56 in (1959) |
| September 24 | 102.9°F (2023) | 53.1°F (1947) | 0.79 in (1951) |
| September 25 | 107.1°F (2005) | 53.1°F (1989) | 1.95 in (1980) |
| September 26 | 107.1°F (2005) | 48.0°F (1942) | 4.71 in (1973) |
| September 27 | 102.9°F (1953) | 41.0°F (1942) | 2.54 in (1964) |
| September 28 | 106.0°F (2005) | 48.9°F (1942) | 1.87 in (1945) |
| September 29 | 100.9°F (2011) | 46.9°F (1967) | 1.91 in (2012) |
| September 30 | 99.0°F (2019) | 48.0°F (1984) | 1.15 in (1988) |