Weather on August 21
Houston, TX
55 Years of Data
Avg High
94°F
Avg Low
77°F
Warmest
2011
91°F avg
Coldest
2008
79°F avg
About This Date
August 21st in Houston, TX typically brings hot summer weather, with average highs around 94°F and lows near 77°F. Over 55 years of records, the warmest August 21st was in 2011 (91°F average), while the coldest was 2008 (79°F) — a 12°F range across recorded history. Rain or other precipitation has occurred on about 16% of August 21st dates historically, with the wettest August 21st recording 3.15" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Houston, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 76° | 84° | — | — |
| 2024 | 100° | 82° | 91° | — | — |
| 2023 | 100° | 82° | 91° | — | — |
| 2022 | 92° | 77° | 84° | 0.03" | — |
| 2021 | 96° | 80° | 88° | — | — |
| 2020 | 95° | 78° | 87° | — | — |
| 2019 | 93° | 79° | 86° | — | — |
| 2018 | 99° | 79° | 89° | — | — |
| 2017 | 95° | 81° | 88° | — | — |
| 2016 | 85° | 74° | 79° | 0.76" | — |
| 2015 | 90° | 74° | 82° | 2.11" | — |
| 2014 | 96° | 79° | 87° | — | — |
| 2013 | 94° | 75° | 84° | — | — |
| 2012 | 96° | 75° | 86° | — | — |
| 2011warmest | 103° | 80° | 91° | — | — |
| 2010 | 92° | 81° | 86° | — | — |
| 2009 | 99° | 80° | 89° | — | — |
| 2008coldest | 82° | 75° | 79° | — | — |
| 2007 | 93° | 80° | 87° | — | — |
| 2006 | 95° | 78° | 87° | — | — |
| 2005 | 98° | 78° | 88° | — | — |
| 2004 | 89° | 72° | 80° | 3.15" | — |
| 2003 | 94° | 74° | 84° | 1.19" | — |
| 2002 | 94° | 79° | 86° | — | — |
| 2001 | 94° | 77° | 85° | — | — |
| 2000 | 99° | 78° | 88° | — | — |
| 1999 | 96° | 81° | 88° | — | — |
| 1998 | 86° | 76° | 81° | 0.56" | — |
| 1997 | 99° | 79° | 89° | — | — |
| 1996 | 89° | 74° | 81° | — | — |
| 1995 | 101° | 77° | 89° | — | — |
| 1994 | 89° | 76° | 82° | — | — |
| 1993 | 95° | 77° | 86° | — | — |
| 1992 | 94° | 72° | 83° | — | — |
| 1991 | 95° | 78° | 87° | — | — |
| 1990 | 97° | 68° | 82° | 2.92" | — |
| 1989 | 91° | 75° | 83° | — | — |
| 1988 | 97° | 78° | 87° | — | — |
| 1987 | 95° | 79° | 87° | — | — |
| 1986 | 91° | 71° | 81° | 0.03" | — |
| 1985 | 92° | 74° | 83° | — | — |
| 1984 | 91° | 76° | 83° | — | — |
| 1983 | 92° | 75° | 83° | — | — |
| 1982 | 89° | 78° | 84° | — | — |
| 1981 | 92° | 74° | 83° | — | — |
| 1980 | 98° | 80° | 89° | — | — |
| 1979 | 93° | 78° | 86° | — | — |
| 1978 | 91° | 79° | 85° | — | — |
| 1977 | 94° | 78° | 86° | — | — |
| 1976 | 89° | 74° | 81° | — | — |
| 1975 | 92° | 78° | 85° | — | — |
| 1974 | 96° | 80° | 88° | — | — |
| 1973 | 94° | 74° | 84° | — | — |
| 1972 | 96° | 76° | 86° | — | — |
| 1971 | 87° | 76° | 81° | 1.02" | — |
55 years of data from HOUSTON WB CITY