Weather on August 21
San Antonio, TX
55 Years of Data
Avg High
96°F
Avg Low
75°F
Warmest
2014
91°F avg
Coldest
2016
77°F avg
About This Date
August 21st in San Antonio, TX typically brings hot summer weather, with average highs around 96°F and lows near 75°F. Over 55 years of records, the warmest August 21st was in 2014 (91°F average), while the coldest was 2016 (77°F) — a 14°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 21st dates historically, with the wettest August 21st recording 1.6" of rain. The last decade has been 1.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.3°F cooler on this date compared to 20-30 years ago.
Planning for August 21st in San Antonio, TX? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 90° | 75° | 82° | — | — |
| 2024 | 104° | 76° | 90° | — | — |
| 2023 | 90° | 77° | 83° | — | — |
| 2022 | 94° | 78° | 86° | — | — |
| 2021 | 93° | 77° | 85° | — | — |
| 2020 | 99° | 65° | 82° | — | — |
| 2019 | 97° | 77° | 87° | — | — |
| 2018 | 99° | 78° | 88° | — | — |
| 2017 | 96° | 75° | 86° | — | — |
| 2016coldest | 82° | 72° | 77° | 1.6" | — |
| 2015 | 92° | 72° | 82° | — | — |
| 2014warmest | 102° | 81° | 91° | — | — |
| 2013 | 95° | 70° | 82° | — | — |
| 2012 | 95° | 72° | 83° | — | — |
| 2011 | 102° | 77° | 90° | — | — |
| 2010 | 98° | 77° | 88° | — | — |
| 2009 | 101° | 77° | 89° | — | — |
| 2008 | 88° | 69° | 78° | — | — |
| 2007 | 90° | 73° | 81° | — | — |
| 2006 | 98° | 75° | 87° | — | — |
| 2005 | 97° | 75° | 86° | — | — |
| 2004 | 97° | 76° | 86° | — | — |
| 2003 | 94° | 76° | 85° | — | — |
| 2002 | 94° | 77° | 85° | — | — |
| 2001 | 98° | 74° | 86° | — | — |
| 2000 | 97° | 75° | 86° | — | — |
| 1999 | 103° | 74° | 88° | — | — |
| 1998 | 97° | 74° | 85° | — | — |
| 1997 | 100° | 77° | 89° | — | — |
| 1996 | 96° | 70° | 83° | — | — |
| 1995 | 100° | 75° | 88° | — | — |
| 1994 | 96° | 76° | 86° | — | — |
| 1993 | 99° | 74° | 86° | — | — |
| 1992 | 93° | 69° | 81° | — | — |
| 1991 | 101° | 77° | 89° | — | — |
| 1990 | 97° | 75° | 86° | — | — |
| 1989 | 99° | 78° | 88° | — | — |
| 1988 | 98° | 78° | 88° | — | — |
| 1987 | 97° | 76° | 86° | — | — |
| 1986 | 93° | 73° | 83° | 0.1" | — |
| 1985 | 98° | 77° | 88° | — | — |
| 1984 | 96° | 75° | 86° | — | — |
| 1983 | 98° | 78° | 88° | — | — |
| 1982 | 95° | 72° | 83° | — | — |
| 1981 | 95° | 68° | 82° | — | — |
| 1980 | 94° | 75° | 84° | — | — |
| 1979 | 94° | 76° | 85° | — | — |
| 1978 | 94° | 72° | 83° | — | — |
| 1977 | 96° | 77° | 87° | — | — |
| 1976 | 89° | 66° | 78° | — | — |
| 1975 | 94° | 76° | 85° | — | — |
| 1974 | 92° | 75° | 83° | — | — |
| 1973 | 94° | 72° | 83° | — | — |
| 1972 | 93° | 71° | 82° | — | — |
| 1971 | 92° | 76° | 84° | — | — |
55 years of data from SAN ANTONIO INCARNATE WORD