San Antonio Weather in December
Average highs run from 74°F on December 1 to 70°F on December 31, and lows from 54°F to 50°F. Normal precipitation for the month is 2.53 in over about 7 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 72°F
- Average low
- 52°F
- Precipitation
- 2.53 in
- Record high
- 88°FDec 1, 1982
- Record low
- 18°FDec 13, 1962
- Chance of a freeze
- 27%
- Daylight
- 10 h 28 min to 10 h 22 min
- Cloud cover
- 54%
- Humidity
- 79%
- Dew point
- 55°F
- Wind
- 9.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 74°F | 54°F | 88°F 1982 | 31°F 1957 | 21% |
| Dec 2 | 74°F | 54°F | 88°F 1991 | 32°F 1910 | 21% |
| Dec 3 | 74°F | 54°F | 86°F 1978 | 31°F 1910 | 21% |
| Dec 4 | 74°F | 54°F | 86°F 1964 | 30°F 1903 | 21% |
| Dec 5 | 73°F | 54°F | 86°F 1928 | 32°F 1907 | 21% |
| Dec 6 | 73°F | 54°F | 85°F 1936 | 30°F 1895 | 21% |
| Dec 7 | 73°F | 54°F | 87°F 1978 | 25°F 1937 | 22% |
| Dec 8 | 73°F | 54°F | 87°F 1978 | 29°F 1937 | 22% |
| Dec 9 | 73°F | 53°F | 85°F 1924 | 32°F 1934 | 22% |
| Dec 10 | 73°F | 53°F | 87°F 1961 | 29°F 1917 | 22% |
| Dec 11 | 73°F | 53°F | 85°F 1947 | 29°F 1934 | 22% |
| Dec 12 | 73°F | 53°F | 85°F 1985 | 22°F 1934 | 22% |
| Dec 13 | 72°F | 53°F | 85°F 1948 | 18°F 1962 | 23% |
| Dec 14 | 72°F | 53°F | 87°F 2001 | 25°F 1962 | 23% |
| Dec 15 | 72°F | 52°F | 87°F 1971 | 30°F 1944 | 23% |
| Dec 16 | 72°F | 52°F | 86°F 1940 | 26°F 1968 | 23% |
| Dec 17 | 72°F | 52°F | 85°F 1931 | 28°F 1968 | 23% |
| Dec 18 | 72°F | 52°F | 85°F 1967 | 32°F 1988 | 23% |
| Dec 19 | 72°F | 52°F | 87°F 1990 | 27°F 1975 | 23% |
| Dec 20 | 71°F | 52°F | 86°F 1990 | 26°F 2000 | 23% |
| Dec 21 | 71°F | 51°F | 85°F 1990 | 27°F 1927 | 23% |
| Dec 22 | 71°F | 51°F | 85°F 1990 | 30°F 1960 | 23% |
| Dec 23 | 71°F | 51°F | 84°F 1956 | 26°F 1989 | 23% |
| Dec 24 | 71°F | 51°F | 84°F 1924 | 20°F 1989 | 24% |
| Dec 25 | 71°F | 51°F | 85°F 1962 | 20°F 1983 | 24% |
| Dec 26 | 71°F | 51°F | 86°F 1916 | 20°F 1983 | 24% |
| Dec 27 | 71°F | 51°F | 84°F 1942 | 25°F 1935 | 24% |
| Dec 28 | 71°F | 50°F | 84°F 2007 | 26°F 1902 | 24% |
| Dec 29 | 70°F | 50°F | 85°F 1946 | 29°F 2010 | 24% |
| Dec 30 | 70°F | 50°F | 87°F 1990 | 23°F 1909 | 24% |
| Dec 31 | 70°F | 50°F | 85°F 1923 | 22°F 1909 | 24% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:04 AM, sunset 5:32 PM
- December 31
- sunrise 7:21 AM, sunset 5:43 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00087851 (Saint Leo), public domain. Records: NOAA GHCN-Daily, station USC00087851, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.