Weather on May 21
San Antonio, TX
55 Years of Data
Avg High
87°F
Avg Low
67°F
Warmest
2022
86°F avg
Coldest
2002
65°F avg
About This Date
May 21st in San Antonio, TX typically brings warm spring weather, with average highs around 87°F and lows near 67°F. Over 55 years of records, the warmest May 21st was in 2022 (86°F average), while the coldest was 2002 (65°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 24% of May 21st dates historically, with the wettest May 21st recording 4.45" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in San Antonio, 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 | 97° | 73° | 85° | — | — |
| 2024 | 94° | 75° | 84° | — | — |
| 2023 | 73° | 66° | 70° | 0.43" | — |
| 2022warmest | 101° | 72° | 86° | — | — |
| 2021 | 74° | 58° | 66° | — | — |
| 2020 | 95° | 69° | 82° | — | — |
| 2019 | 89° | 77° | 83° | — | — |
| 2018 | 85° | 66° | 75° | — | — |
| 2017 | 80° | 71° | 76° | — | — |
| 2016 | 86° | 73° | 80° | — | — |
| 2015 | 78° | 66° | 72° | 0.71" | — |
| 2014 | 88° | 67° | 77° | — | — |
| 2013 | 92° | 73° | 82° | — | — |
| 2012 | 86° | 66° | 76° | — | — |
| 2011 | 91° | 75° | 83° | — | — |
| 2010 | 82° | 73° | 78° | — | — |
| 2009 | 84° | 58° | 71° | — | — |
| 2008 | 97° | 68° | 82° | — | — |
| 2007 | 76° | 65° | 70° | — | — |
| 2006 | 93° | 64° | 79° | — | — |
| 2005 | 89° | 67° | 78° | — | — |
| 2004 | 88° | 71° | 79° | 0.05" | — |
| 2003 | 85° | 63° | 74° | — | — |
| 2002coldest | 79° | 52° | 65° | — | — |
| 2001 | 91° | 71° | 81° | 0.05" | — |
| 2000 | 76° | 64° | 70° | — | — |
| 1999 | 85° | 70° | 77° | — | — |
| 1998 | 92° | 69° | 80° | — | — |
| 1997 | 79° | 66° | 72° | 0.18" | — |
| 1996 | 97° | 73° | 85° | — | — |
| 1995 | 91° | 64° | 78° | — | — |
| 1994 | 85° | 57° | 71° | — | — |
| 1993 | 86° | 60° | 73° | — | — |
| 1992 | 77° | 65° | 71° | 3.3" | — |
| 1991 | 87° | 68° | 78° | — | — |
| 1990 | 94° | 72° | 83° | — | — |
| 1989 | 95° | 68° | 82° | — | — |
| 1988 | 82° | 63° | 72° | 0.2" | — |
| 1987 | 88° | 66° | 77° | 1.83" | — |
| 1986 | 89° | 61° | 75° | — | — |
| 1985 | 88° | 64° | 76° | 0.18" | — |
| 1984 | 95° | 65° | 80° | — | — |
| 1983 | 85° | 62° | 73° | 4.45" | — |
| 1982 | 86° | 71° | 79° | — | — |
| 1981 | 78° | 62° | 70° | — | — |
| 1980 | 87° | 63° | 75° | 1.04" | — |
| 1979 | 85° | 73° | 79° | — | — |
| 1978 | 79° | 68° | 73° | 0.41" | — |
| 1977 | 80° | 60° | 70° | 2.57" | — |
| 1976 | 82° | 62° | 72° | — | — |
| 1975 | 88° | 75° | 81° | — | — |
| 1974 | 88° | 69° | 78° | — | — |
| 1973 | 91° | 70° | 80° | — | — |
| 1972 | 86° | 61° | 73° | — | — |
| 1971 | 91° | 72° | 81° | — | — |
55 years of data from SAN ANTONIO INCARNATE WORD