Weather on December 21
San Antonio, TX
55 Years of Data
Avg High
64°F
Avg Low
40°F
Warmest
2013
70°F avg
Coldest
1983
33°F avg
About This Date
December 21st in San Antonio, TX typically brings mild winter weather, with average highs around 64°F and lows near 40°F. Over 55 years of records, the warmest December 21st was in 2013 (70°F average), while the coldest was 1983 (33°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 16% of December 21st dates historically, with the wettest December 21st recording 6.6" of rain. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in San Antonio, TX? Great weather for outdoor activities.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 52° | 64° | — | — |
| 2024 | 65° | 44° | 54° | — | — |
| 2023 | 64° | 61° | 62° | — | — |
| 2022 | 50° | 36° | 43° | — | — |
| 2021 | 59° | 36° | 47° | — | — |
| 2020 | 73° | 32° | 53° | — | — |
| 2019 | 64° | 40° | 52° | — | — |
| 2018 | 65° | 32° | 48° | — | — |
| 2017 | 72° | 41° | 56° | — | — |
| 2016 | 69° | 39° | 54° | — | — |
| 2015 | 74° | 55° | 64° | — | — |
| 2014 | 56° | 52° | 54° | — | — |
| 2013warmest | 74° | 66° | 70° | 0.08" | — |
| 2012 | 57° | 29° | 43° | — | — |
| 2011 | 61° | 43° | 52° | — | — |
| 2010 | 76° | 57° | 66° | — | — |
| 2009 | 65° | 34° | 49° | — | — |
| 2008 | 74° | 41° | 57° | — | — |
| 2007 | 78° | 39° | 59° | — | — |
| 2006 | 66° | 45° | 55° | 0.05" | — |
| 2005 | 56° | 38° | 47° | — | — |
| 2004 | 70° | 41° | 55° | — | — |
| 2003 | 66° | 31° | 48° | — | — |
| 2002 | 67° | 36° | 51° | — | — |
| 2001 | 63° | 34° | 48° | — | — |
| 2000 | 67° | 32° | 49° | — | — |
| 1999 | 47° | 37° | 42° | 0.25" | — |
| 1998 | 69° | 52° | 60° | — | — |
| 1997 | 72° | 41° | 56° | 5.44" | — |
| 1996 | 63° | 45° | 54° | — | — |
| 1995 | 44° | 37° | 41° | 0.36" | — |
| 1994 | 75° | 40° | 57° | — | — |
| 1993 | 52° | 32° | 42° | — | — |
| 1992 | 57° | 44° | 51° | — | — |
| 1991 | 69° | 54° | 61° | 6.6" | — |
| 1990 | 82° | 26° | 54° | — | — |
| 1989 | 42° | 23° | 33° | — | — |
| 1988 | 77° | 55° | 66° | — | — |
| 1987 | 65° | 46° | 55° | 0.41" | — |
| 1986 | 55° | 45° | 50° | 1.17" | — |
| 1985 | 69° | 36° | 52° | — | — |
| 1984 | 75° | 59° | 67° | — | — |
| 1983coldest | 41° | 24° | 33° | — | — |
| 1982 | 74° | 43° | 58° | — | — |
| 1981 | 75° | 52° | 63° | — | — |
| 1980 | 43° | 33° | 38° | — | — |
| 1979 | 70° | 61° | 65° | 0.03" | — |
| 1978 | 63° | 35° | 49° | — | — |
| 1977 | 58° | 26° | 42° | — | — |
| 1976 | 46° | 28° | 37° | — | — |
| 1975 | 62° | 34° | 48° | — | — |
| 1974 | 72° | 31° | 51° | — | — |
| 1973 | 57° | 17° | 37° | — | — |
| 1972 | 66° | 42° | 54° | — | — |
| 1971 | 77° | 40° | 58° | — | — |
55 years of data from SAN ANTONIO INCARNATE WORD