Weather on December 18
San Antonio, TX
55 Years of Data
Avg High
63°F
Avg Low
41°F
Warmest
2021
74°F avg
Coldest
1996
30°F avg
About This Date
December 18th in San Antonio, TX typically brings mild winter weather, with average highs around 63°F and lows near 41°F. Over 55 years of records, the warmest December 18th was in 2021 (74°F average), while the coldest was 1996 (30°F) — a 44°F range across recorded history. Rain or other precipitation has occurred on about 22% of December 18th dates historically, with the wettest December 18th recording 3.78" of rain. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in San Antonio, TX? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 57° | 69° | — | — |
| 2024 | 74° | 53° | 63° | — | — |
| 2023 | 73° | 41° | 57° | — | — |
| 2022 | 53° | 34° | 43° | — | — |
| 2021warmest | 78° | 70° | 74° | — | — |
| 2020 | 62° | 26° | 44° | — | — |
| 2019 | 59° | 28° | 44° | — | — |
| 2018 | 70° | 36° | 53° | — | — |
| 2017 | 55° | 46° | 51° | 0.05" | — |
| 2016 | 39° | 29° | 34° | — | — |
| 2015 | 60° | 35° | 48° | — | — |
| 2014 | 67° | 56° | 61° | 0.1" | — |
| 2013 | 70° | 35° | 52° | — | — |
| 2012 | 75° | 40° | 57° | — | — |
| 2011 | 59° | 48° | 54° | — | — |
| 2010 | 56° | 36° | 46° | — | — |
| 2009 | 51° | 42° | 47° | 0.15" | — |
| 2008 | 55° | 41° | 48° | 0.08" | — |
| 2007 | 58° | 28° | 43° | — | — |
| 2006 | 78° | 65° | 71° | — | — |
| 2005 | 49° | 40° | 44° | — | — |
| 2004 | 63° | 35° | 49° | — | — |
| 2003 | 65° | 28° | 46° | — | — |
| 2002 | 78° | 62° | 70° | — | — |
| 2001 | 68° | 37° | 53° | — | — |
| 2000 | 56° | 30° | 43° | — | — |
| 1999 | 70° | 34° | 52° | — | — |
| 1998 | 63° | 41° | 52° | — | — |
| 1997 | 70° | 33° | 51° | — | — |
| 1996coldest | 39° | 22° | 30° | — | — |
| 1995 | 65° | 44° | 54° | 0.36" | — |
| 1994 | 67° | 46° | 56° | — | — |
| 1993 | 59° | 45° | 52° | 0.36" | — |
| 1992 | 63° | 35° | 49° | — | — |
| 1991 | 60° | 55° | 58° | 3.78" | — |
| 1990 | 68° | 41° | 55° | — | — |
| 1989 | 43° | 33° | 38° | — | — |
| 1988 | 66° | 32° | 49° | — | — |
| 1987 | 64° | 46° | 55° | 0.48" | — |
| 1986 | 57° | 46° | 52° | 0.33" | — |
| 1985 | 67° | 37° | 52° | — | — |
| 1984 | 75° | 62° | 69° | — | — |
| 1983 | 42° | 26° | 34° | — | — |
| 1982 | 71° | 47° | 59° | — | — |
| 1981 | 51° | 25° | 38° | — | — |
| 1980 | 78° | 40° | 59° | — | — |
| 1979 | 60° | 28° | 44° | — | — |
| 1978 | 65° | 52° | 58° | — | — |
| 1977 | 76° | 33° | 54° | — | — |
| 1976 | 61° | 56° | 58° | 0.13" | — |
| 1975 | 41° | 30° | 36° | — | — |
| 1974 | 71° | 32° | 52° | — | — |
| 1973 | 75° | 41° | 58° | — | — |
| 1972 | 57° | 44° | 51° | 0.05" | — |
| 1971 | 57° | 47° | 52° | 0.08" | — |
55 years of data from SAN ANTONIO INCARNATE WORD