Weather on August 21
San Antonio, TX
55 Years of Data
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° | — | — |
San Antonio, TX Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Antonio, TX Monthly Precipitation
Average rainfall and snowfall per month, in inches.
San Antonio, TX Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit San Antonio, TX
San Antonio, TX has no months that meet our "pleasant" threshold — every season has tradeoffs.