Weather on May 18
San Antonio, TX
55 Years of Data
Avg High
87°F
Avg Low
66°F
Warmest
2025
87°F avg
Coldest
1986
64°F avg
About This Date
May 18th in San Antonio, TX typically brings warm spring weather, with average highs around 87°F and lows near 66°F. Over 55 years of records, the warmest May 18th was in 2025 (87°F average), while the coldest was 1986 (64°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 15% of May 18th dates historically, with the wettest May 18th recording 2.59" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 18th in San Antonio, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 97° | 77° | 87° | — | — |
| 2024 | 88° | 64° | 76° | — | — |
| 2023 | 88° | 65° | 76° | — | — |
| 2022 | 101° | 72° | 86° | — | — |
| 2021 | 81° | 70° | 75° | — | — |
| 2020 | 91° | 62° | 77° | — | — |
| 2019 | 87° | 72° | 79° | — | — |
| 2018 | 95° | 65° | 80° | — | — |
| 2017 | 87° | 67° | 77° | — | — |
| 2016 | 78° | 63° | 70° | 0.36" | — |
| 2015 | 88° | 76° | 82° | — | — |
| 2014 | 86° | 59° | 73° | — | — |
| 2013 | 95° | 72° | 83° | — | — |
| 2012 | 85° | 60° | 72° | — | — |
| 2011 | 89° | 58° | 73° | — | — |
| 2010 | 88° | 65° | 76° | 0.58" | — |
| 2009 | 77° | 57° | 67° | — | — |
| 2008 | 77° | 56° | 66° | — | — |
| 2007 | 78° | 61° | 69° | — | — |
| 2006 | 91° | 58° | 74° | — | — |
| 2005 | 84° | 61° | 72° | — | — |
| 2004 | 87° | 68° | 78° | — | — |
| 2003 | 95° | 67° | 81° | — | — |
| 2002 | 87° | 62° | 75° | — | — |
| 2001 | 89° | 70° | 79° | — | — |
| 2000 | 90° | 71° | 80° | — | — |
| 1999 | 86° | 64° | 75° | 2.59" | — |
| 1998 | 90° | 63° | 76° | — | — |
| 1997 | 85° | 70° | 77° | — | — |
| 1996 | 95° | 73° | 84° | — | — |
| 1995 | 90° | 68° | 79° | — | — |
| 1994 | 89° | 67° | 78° | — | — |
| 1993 | 91° | 64° | 78° | 1.09" | — |
| 1992 | 84° | 68° | 76° | — | — |
| 1991 | 90° | 64° | 77° | — | — |
| 1990 | 89° | 73° | 81° | — | — |
| 1989 | 97° | 69° | 83° | — | — |
| 1988 | 89° | 64° | 77° | — | — |
| 1987 | 86° | 72° | 79° | — | — |
| 1986coldest | 75° | 53° | 64° | — | — |
| 1985 | 81° | 62° | 71° | 0.18" | — |
| 1984 | 75° | 67° | 71° | 1.96" | — |
| 1983 | 85° | 65° | 75° | 0.1" | — |
| 1982 | 84° | 67° | 75° | — | — |
| 1981 | 97° | 69° | 83° | — | — |
| 1980 | 82° | 65° | 73° | 2.36" | — |
| 1979 | 86° | 70° | 78° | — | — |
| 1978 | 89° | 72° | 80° | — | — |
| 1977 | 82° | 70° | 76° | — | — |
| 1976 | 80° | 54° | 67° | — | — |
| 1975 | 86° | 63° | 74° | — | — |
| 1974 | 90° | 75° | 82° | — | — |
| 1973 | 90° | 58° | 74° | — | — |
| 1972 | 85° | 62° | 73° | — | — |
| 1971 | 91° | 68° | 80° | — | — |
55 years of data from SAN ANTONIO INCARNATE WORD