Weather on March 18
San Antonio, TX
55 Years of Data
Avg High
77°F
Avg Low
53°F
Warmest
2018
78°F avg
Coldest
1988
45°F avg
About This Date
March 18th in San Antonio, TX typically brings pleasant spring weather, with average highs around 77°F and lows near 53°F. Over 56 years of records, the warmest March 18th was in 2018 (78°F average), while the coldest was 1988 (45°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 23% of March 18th dates historically, with the wettest March 18th recording 1.55" of rain. The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
Planning for March 18th in San Antonio, TX? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 78° | 46° | 62° | — | — |
| 2025 | 89° | 60° | 75° | — | — |
| 2024 | 66° | 56° | 61° | — | — |
| 2023 | 50° | 40° | 45° | 0.79" | — |
| 2022 | 75° | 50° | 63° | — | — |
| 2021 | 80° | 52° | 66° | — | — |
| 2020 | 82° | 67° | 74° | — | — |
| 2019 | 64° | 40° | 52° | — | — |
| 2018warmest | 87° | 68° | 78° | 0.2" | — |
| 2017 | 81° | 61° | 71° | — | — |
| 2016 | 82° | 58° | 70° | 0.15" | — |
| 2015 | 74° | 62° | 68° | 0.43" | — |
| 2014 | 70° | 42° | 56° | — | — |
| 2013 | 86° | 62° | 74° | — | — |
| 2012 | 79° | 67° | 73° | — | — |
| 2011 | 84° | 67° | 75° | — | — |
| 2010 | 74° | 44° | 59° | — | — |
| 2009 | 84° | 47° | 65° | — | — |
| 2008 | 82° | 67° | 74° | 0.08" | — |
| 2007 | 75° | 52° | 63° | — | — |
| 2006 | 80° | 63° | 71° | 0.03" | — |
| 2005 | 66° | 35° | 51° | — | — |
| 2004 | 82° | 61° | 71° | — | — |
| 2003 | 75° | 60° | 68° | — | — |
| 2002 | 77° | 61° | 69° | 0.05" | — |
| 2001 | 56° | 47° | 51° | 0.05" | — |
| 2000 | 51° | 40° | 45° | 0.08" | — |
| 1999 | 76° | 60° | 68° | 0.05" | — |
| 1998 | 78° | 49° | 63° | — | — |
| 1997 | 78° | 60° | 69° | 0.23" | — |
| 1996 | 69° | 47° | 58° | — | — |
| 1995 | 84° | 49° | 66° | — | — |
| 1994 | 87° | 62° | 75° | — | — |
| 1993 | 75° | 52° | 63° | — | — |
| 1992 | 85° | 54° | 69° | — | — |
| 1991 | 73° | 43° | 58° | — | — |
| 1990 | 77° | 44° | 61° | — | — |
| 1989 | 83° | 66° | 74° | — | — |
| 1988coldest | 57° | 34° | 45° | — | — |
| 1987 | 79° | 44° | 61° | — | — |
| 1986 | 81° | 51° | 66° | 0.25" | — |
| 1985 | 67° | 48° | 57° | — | — |
| 1984 | 89° | 62° | 76° | 1.55" | — |
| 1983 | 68° | 40° | 54° | — | — |
| 1982 | 85° | 69° | 77° | — | — |
| 1981 | 73° | 50° | 62° | — | — |
| 1980 | 68° | 32° | 50° | — | — |
| 1979 | 80° | 69° | 75° | — | — |
| 1978 | 78° | 38° | 58° | — | — |
| 1977 | 81° | 57° | 69° | — | — |
| 1976 | 80° | 46° | 63° | — | — |
| 1975 | 79° | 50° | 64° | — | — |
| 1974 | 80° | 67° | 73° | — | — |
| 1973 | 80° | 43° | 61° | — | — |
| 1972 | 86° | 48° | 67° | — | — |
| 1971 | 92° | 58° | 75° | — | — |
56 years of data from SAN ANTONIO INCARNATE WORD