Weather on September 21
Houston, TX
55 Years of Data
Avg High
87°F
Avg Low
71°F
Warmest
2021
88°F avg
Coldest
1983
62°F avg
About This Date
September 21st in Houston, TX typically brings warm fall weather, with average highs around 87°F and lows near 71°F. Over 55 years of records, the warmest September 21st was in 2021 (88°F average), while the coldest was 1983 (62°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 25% of September 21st dates historically, with the wettest September 21st recording 9.7" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Houston, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 76° | 82° | 0.51" | — |
| 2024 | 94° | 77° | 85° | — | — |
| 2023 | 96° | 79° | 87° | — | — |
| 2022 | 94° | 75° | 84° | — | — |
| 2021warmest | 97° | 79° | 88° | — | — |
| 2020 | 78° | 71° | 75° | 9.7" | — |
| 2019 | 90° | 76° | 83° | — | — |
| 2018 | 91° | 79° | 85° | 0.05" | — |
| 2017 | 89° | 75° | 82° | 1.55" | — |
| 2016 | 94° | 76° | 85° | — | — |
| 2015 | 90° | 74° | 82° | — | — |
| 2014 | 91° | 75° | 83° | — | — |
| 2013 | 79° | 72° | 75° | 3.53" | — |
| 2012 | 87° | 63° | 75° | — | — |
| 2011 | 92° | 72° | 82° | — | — |
| 2010 | 85° | 74° | 79° | — | — |
| 2009 | 92° | 73° | 82° | — | — |
| 2008 | 88° | 70° | 79° | — | — |
| 2007 | 90° | 70° | 80° | — | — |
| 2006 | 88° | 64° | 76° | — | — |
| 2005 | 97° | 77° | 87° | — | — |
| 2004 | 90° | 74° | 82° | 0.23" | — |
| 2003 | 76° | 71° | 73° | 1.27" | — |
| 2002 | 89° | 64° | 77° | — | — |
| 2001 | — | 72° | — | — | — |
| 2000 | 87° | 74° | 80° | 0.64" | — |
| 1999 | 87° | 63° | 75° | — | — |
| 1998 | 93° | 79° | 86° | — | — |
| 1997 | 86° | 74° | 80° | — | — |
| 1996 | 93° | 69° | 81° | 0.05" | — |
| 1995 | 87° | 60° | 74° | 2.36" | — |
| 1994 | 89° | 67° | 78° | 0.25" | — |
| 1993 | 93° | 77° | 85° | — | — |
| 1992 | 91° | 78° | 85° | — | — |
| 1991 | 84° | 59° | 72° | — | — |
| 1990 | 92° | 76° | 84° | — | — |
| 1989 | 82° | 64° | 73° | — | — |
| 1988 | 91° | 75° | 83° | — | — |
| 1987 | 84° | 70° | 77° | — | — |
| 1986 | 85° | 74° | 79° | 0.03" | — |
| 1985 | 86° | 70° | 78° | — | — |
| 1984 | 76° | 68° | 72° | 2.16" | — |
| 1983coldest | 68° | 56° | 62° | — | — |
| 1982 | 80° | 66° | 73° | — | — |
| 1981 | 86° | 68° | 77° | — | — |
| 1980 | 92° | 81° | 86° | — | — |
| 1979 | 82° | 67° | 74° | — | — |
| 1978 | 85° | 74° | 79° | 0.18" | — |
| 1977 | 91° | 73° | 82° | — | — |
| 1976 | 80° | 67° | 73° | — | — |
| 1975 | 82° | 66° | 74° | — | — |
| 1974 | 88° | 73° | 80° | — | — |
| 1973 | 87° | 73° | 80° | — | — |
| 1972 | 92° | 77° | 84° | — | — |
| 1971 | 76° | 64° | 70° | — | — |
55 years of data from HOUSTON WB CITY