Weather on May 20
San Antonio, TX
55 Years of Data
Avg High
87°F
Avg Low
67°F
Warmest
2025
89°F avg
Coldest
2002
64°F avg
About This Date
May 20th 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 20th was in 2025 (89°F average), while the coldest was 2002 (64°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 25% of May 20th dates historically, with the wettest May 20th recording 3.15" of rain. The last decade has been 4.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.5°F warmer on this date compared to 20-30 years ago.
Planning for May 20th in San Antonio, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 100° | 78° | 89° | — | — |
| 2024 | 93° | 73° | 83° | — | — |
| 2023 | 81° | 67° | 74° | 0.79" | — |
| 2022 | 96° | 77° | 87° | — | — |
| 2021 | 82° | 66° | 74° | — | — |
| 2020 | 95° | 66° | 81° | — | — |
| 2019 | 89° | 76° | 82° | — | — |
| 2018 | 92° | 72° | 82° | 0.79" | — |
| 2017 | 90° | 74° | 82° | — | — |
| 2016 | 81° | 62° | 71° | — | — |
| 2015 | 89° | 75° | 82° | — | — |
| 2014 | 86° | 66° | 76° | — | — |
| 2013 | 92° | 73° | 82° | — | — |
| 2012 | 86° | 69° | 78° | — | — |
| 2011 | 82° | 75° | 79° | — | — |
| 2010 | 85° | 68° | 76° | — | — |
| 2009 | 83° | 54° | 68° | — | — |
| 2008 | 94° | 59° | 76° | — | — |
| 2007 | 79° | 64° | 71° | — | — |
| 2006 | 96° | 63° | 79° | — | — |
| 2005 | 85° | 71° | 78° | — | — |
| 2004 | 87° | 71° | 79° | — | — |
| 2003 | 95° | 73° | 84° | — | — |
| 2002coldest | 76° | 52° | 64° | — | — |
| 2001 | 81° | 69° | 75° | — | — |
| 2000 | 78° | 63° | 70° | 3.15" | — |
| 1999 | 84° | 62° | 73° | — | — |
| 1998 | 92° | 65° | 78° | — | — |
| 1997 | 79° | 65° | 72° | 0.91" | — |
| 1996 | 100° | 73° | 87° | — | — |
| 1995 | 88° | 58° | 73° | — | — |
| 1994 | 86° | 58° | 72° | — | — |
| 1993 | 86° | 57° | 72° | — | — |
| 1992 | 82° | 69° | 76° | 1.57" | — |
| 1991 | 88° | 70° | 79° | — | — |
| 1990 | 94° | 72° | 83° | — | — |
| 1989 | 99° | 77° | 88° | 0.03" | — |
| 1988 | 87° | 64° | 76° | 0.58" | — |
| 1987 | 89° | 64° | 77° | 0.08" | — |
| 1986 | 86° | 53° | 70° | — | — |
| 1985 | 85° | 69° | 77° | — | — |
| 1984 | 91° | 66° | 79° | — | — |
| 1983 | 71° | 61° | 66° | 1.37" | — |
| 1982 | 87° | 71° | 79° | — | — |
| 1981 | 82° | 56° | 69° | — | — |
| 1980 | 86° | 62° | 74° | — | — |
| 1979 | 84° | 75° | 80° | 0.2" | — |
| 1978 | 77° | 68° | 73° | 1.57" | — |
| 1977 | 81° | 72° | 76° | — | — |
| 1976 | 74° | 62° | 68° | 1.45" | — |
| 1975 | 88° | 65° | 76° | 0.03" | — |
| 1974 | 87° | 72° | 79° | — | — |
| 1973 | 93° | 65° | 79° | — | — |
| 1972 | 86° | 63° | 74° | — | — |
| 1971 | 86° | 64° | 75° | 0.05" | — |
55 years of data from SAN ANTONIO INCARNATE WORD