Weather on March 21
San Antonio, TX
55 Years of Data
Avg High
75°F
Avg Low
50°F
Warmest
1995
76°F avg
Coldest
2010
45°F avg
About This Date
March 21st in San Antonio, TX typically brings pleasant spring weather, with average highs around 75°F and lows near 50°F — a 25°F daily swing. Over 56 years of records, the warmest March 21st was in 1995 (76°F average), while the coldest was 2010 (45°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 25% of March 21st dates historically, with the wettest March 21st recording 1.98" of rain. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in San Antonio, TX? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 93° | 57° | 75° | — | — |
| 2025 | 79° | 48° | 63° | — | — |
| 2024 | 65° | 55° | 60° | 0.2" | — |
| 2023 | 72° | 53° | 62° | 0.53" | — |
| 2022 | 89° | 60° | 75° | 0.58" | — |
| 2021 | 70° | 38° | 54° | — | — |
| 2020 | 70° | 51° | 60° | — | — |
| 2019 | 75° | 47° | 61° | 0.13" | — |
| 2018 | 77° | 41° | 59° | — | — |
| 2017 | 82° | 60° | 71° | — | — |
| 2016 | 65° | 36° | 50° | — | — |
| 2015 | 65° | 58° | 61° | 1.98" | — |
| 2014 | 77° | 46° | 62° | — | — |
| 2013 | 74° | 57° | 65° | — | — |
| 2012 | 68° | 49° | 58° | — | — |
| 2011 | 81° | 65° | 73° | — | — |
| 2010coldest | 53° | 37° | 45° | 0.23" | — |
| 2009 | 83° | 51° | 67° | — | — |
| 2008 | 75° | 39° | 57° | — | — |
| 2007 | 74° | 65° | 69° | 0.1" | — |
| 2006 | 80° | 45° | 62° | — | — |
| 2005 | 80° | 58° | 69° | 0.08" | — |
| 2004 | 79° | 64° | 71° | — | — |
| 2003 | 68° | 43° | 55° | — | — |
| 2002 | 76° | 44° | 60° | — | — |
| 2001 | 71° | 37° | 54° | — | — |
| 2000 | 76° | 41° | 58° | 0.13" | — |
| 1999 | 75° | 44° | 60° | — | — |
| 1998 | 68° | 38° | 53° | — | — |
| 1997 | 85° | 48° | 66° | — | — |
| 1996 | 75° | 31° | 53° | — | — |
| 1995warmest | 88° | 65° | 76° | — | — |
| 1994 | 81° | 59° | 70° | — | — |
| 1993 | 70° | 54° | 62° | — | — |
| 1992 | 67° | 57° | 62° | 0.03" | — |
| 1991 | 80° | 68° | 74° | — | — |
| 1990 | 77° | 49° | 63° | — | — |
| 1989 | 55° | 38° | 46° | 0.1" | — |
| 1988 | 81° | 38° | 59° | — | — |
| 1987 | 76° | 64° | 70° | — | — |
| 1986 | 71° | 36° | 53° | — | — |
| 1985 | 67° | 47° | 57° | — | — |
| 1984 | 78° | 43° | 60° | — | — |
| 1983 | 58° | 35° | 46° | — | — |
| 1982 | 74° | 53° | 63° | 0.1" | — |
| 1981 | 81° | 59° | 70° | — | — |
| 1980 | 74° | 40° | 57° | — | — |
| 1979 | 73° | 61° | 67° | 0.58" | — |
| 1978 | 83° | 61° | 72° | — | — |
| 1977 | 78° | 52° | 65° | — | — |
| 1976 | 69° | 52° | 60° | 0.03" | — |
| 1975 | 80° | 64° | 72° | — | — |
| 1974 | 63° | 43° | 53° | — | — |
| 1973 | 75° | 45° | 60° | — | — |
| 1972 | 87° | 60° | 74° | — | — |
| 1971 | 84° | 55° | 70° | — | — |
56 years of data from SAN ANTONIO INCARNATE WORD