Weather on September 21
Austin, TX
55 Years of Data
Avg High
88°F
Avg Low
68°F
Warmest
2019
89°F avg
Coldest
1983
62°F avg
About This Date
September 21st in Austin, TX typically brings warm fall weather, with average highs around 88°F and lows near 68°F. Over 55 years of records, the warmest September 21st was in 2019 (89°F average), while the coldest was 1983 (62°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 21st dates historically, with the wettest September 21st recording 3.43" of rain. The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Austin, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 75° | 87° | — | — |
| 2024 | 98° | 77° | 88° | — | — |
| 2023 | 97° | 76° | 86° | — | — |
| 2022 | 98° | 73° | 86° | — | — |
| 2021 | 95° | 77° | 86° | — | — |
| 2020 | 73° | 68° | 71° | 0.46" | — |
| 2019warmest | 99° | 79° | 89° | — | — |
| 2018 | 89° | 70° | 79° | 1.02" | — |
| 2017 | 93° | 73° | 83° | — | — |
| 2016 | 95° | 70° | 82° | — | — |
| 2015 | 95° | 73° | 84° | — | — |
| 2014 | 90° | 72° | 81° | — | — |
| 2013 | 80° | 69° | 75° | 3.43" | — |
| 2012 | 88° | 58° | 73° | — | — |
| 2011 | 94° | 63° | 78° | — | — |
| 2010 | 86° | 67° | 76° | 0.38" | — |
| 2009 | 94° | 68° | 81° | — | — |
| 2008 | 89° | 58° | 73° | — | — |
| 2007 | 89° | 62° | 76° | — | — |
| 2006 | 91° | 54° | 72° | — | — |
| 2005 | 98° | 67° | 82° | — | — |
| 2004 | 94° | 63° | 78° | — | — |
| 2003 | 74° | 67° | 70° | 0.86" | — |
| 2002 | 90° | 59° | 74° | — | — |
| 2001 | 88° | 70° | 79° | 0.08" | — |
| 2000 | 87° | 69° | 78° | 0.48" | — |
| 1999 | 83° | 66° | 74° | — | — |
| 1998 | 92° | 75° | 83° | — | — |
| 1997 | 93° | 74° | 83° | — | — |
| 1996 | 84° | 69° | 77° | 0.05" | — |
| 1995 | 77° | 53° | 65° | 1.22" | — |
| 1994 | 87° | 60° | 74° | — | — |
| 1993 | 97° | 76° | 86° | — | — |
| 1992 | 97° | 72° | 84° | 1.98" | — |
| 1991 | 81° | 60° | 70° | — | — |
| 1990 | 93° | 76° | 84° | — | — |
| 1989 | 92° | 66° | 79° | — | — |
| 1988 | 96° | 73° | 85° | — | — |
| 1987 | 87° | 68° | 78° | — | — |
| 1986 | 89° | 74° | 81° | 0.53" | — |
| 1985 | 89° | 68° | 79° | — | — |
| 1984 | 76° | 65° | 70° | 0.36" | — |
| 1983coldest | 72° | 53° | 62° | — | — |
| 1982 | 83° | 63° | 73° | — | — |
| 1981 | 89° | 61° | 75° | — | — |
| 1980 | 94° | 79° | 86° | — | — |
| 1979 | 85° | 64° | 74° | — | — |
| 1978 | 82° | 70° | 76° | 0.08" | — |
| 1977 | 91° | 70° | 80° | — | — |
| 1976 | 83° | 64° | 73° | — | — |
| 1975 | 74° | 60° | 67° | 0.05" | — |
| 1974 | 76° | 69° | 72° | 0.38" | — |
| 1973 | 92° | 72° | 82° | — | — |
| 1972 | 93° | 73° | 83° | — | — |
| 1971 | 71° | 60° | 66° | 0.86" | — |
55 years of data from AUSTIN 6S