San Antonio weather in December: San Antonio, Texas: normal highs, lows, rain and records for December
San Antonio in December has a normal high of 65°F and a normal low of 42°F, a daily mean of 54°F, falling from 67°F on the 1st to 63°F by the 31st. Measurable precipitation falls on 7 days in a normal December, 2.00 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 18°C and low of 6°C, 51 mm of precipitation and 0 cm of snow in December.
- NOAA stationSan Antonio International Airport
- Station IDUSW00012921
- Location29.54°N 98.48°W
- Elevation789 ft (241 m)
- From the center6 miles
- Population1,526,656
- Jan 63° 41°
- Feb 68° 45°
- Mar 74° 52°
- Apr 80° 58°
- May 87° 66°
- Jun 92° 73°
- Jul 95° 75°
- Aug 96° 75°
- Sep 90° 70°
- Oct 82° 60°
- Nov 72° 50°
- Dec 65° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Antonio in December?
The normal high is 65°F and the normal low 42°F, for a daily mean of 53.5°F. December is 7.2°F cooler than November and 1.3°F warmer than January. December is the 11th warmest month of the year in San Antonio and the 10th wettest, and the snowiest. Across the month the normal high falls 4°F, from 67°F on December 1 to 63°F on December 31. From one year to the next December's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 51°F and 56°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 67°F | 45°F | 23% | 10% |
| December 8 | 66°F | 44°F | 24% | 10% |
| December 15 | 65°F | 42°F | 24% | 11% |
| December 22 | 64°F | 41°F | 24% | 11% |
| December 31 | 63°F | 41°F | 23% | 12% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 67°F | 45°F | 23% | 10% | 10 h 20 min |
| December 2 | 67°F | 45°F | 23% | 10% | 10 h 20 min |
| December 3 | 67°F | 45°F | 23% | 10% | 10 h 20 min |
| December 4 | 67°F | 44°F | 23% | 10% | 10 h 20 min |
| December 5 | 67°F | 44°F | 23% | 10% | 10 h 20 min |
| December 6 | 66°F | 44°F | 23% | 10% | 10 h 20 min |
| December 7 | 66°F | 44°F | 23% | 10% | 10 h 20 min |
| December 8 | 66°F | 44°F | 24% | 10% | 10 h 20 min |
| December 9 | 66°F | 43°F | 24% | 10% | 10 h 20 min |
| December 10 | 66°F | 43°F | 24% | 10% | 10 h 20 min |
| December 11 | 65°F | 43°F | 24% | 11% | 10 h 20 min |
| December 12 | 65°F | 43°F | 24% | 11% | 10 h 20 min |
| December 13 | 65°F | 43°F | 24% | 11% | 10 h 20 min |
| December 14 | 65°F | 42°F | 24% | 11% | 10 h 20 min |
| December 15 | 65°F | 42°F | 24% | 11% | 10 h 20 min |
| December 16 | 65°F | 42°F | 24% | 11% | 10 h 20 min |
| December 17 | 64°F | 42°F | 24% | 11% | 10 h 20 min |
| December 18 | 64°F | 42°F | 24% | 11% | 10 h 20 min |
| December 19 | 64°F | 42°F | 24% | 11% | 10 h 20 min |
| December 20 | 64°F | 42°F | 24% | 11% | 10 h 10 min |
| December 21 | 64°F | 42°F | 24% | 11% | 10 h 10 min |
| December 22 | 64°F | 41°F | 24% | 11% | 10 h 10 min |
| December 23 | 64°F | 41°F | 24% | 11% | 10 h 10 min |
| December 24 | 63°F | 41°F | 24% | 11% | 10 h 10 min |
| December 25 | 63°F | 41°F | 24% | 11% | 10 h 20 min |
| December 26 | 63°F | 41°F | 24% | 11% | 10 h 20 min |
| December 27 | 63°F | 41°F | 24% | 11% | 10 h 20 min |
| December 28 | 63°F | 41°F | 23% | 12% | 10 h 20 min |
| December 29 | 63°F | 41°F | 23% | 12% | 10 h 20 min |
| December 30 | 63°F | 41°F | 23% | 12% | 10 h 20 min |
| December 31 | 63°F | 41°F | 23% | 12% | 10 h 20 min |
- Normal high
- 65°FDecember average
- Normal low
- 42°FDecember average
- Precipitation
- 2.00 inmonth total
- Days with precipitation
- 70.01 inch or more
- Snowfall
- 0.1 inmonth total
- Nights at 32°F or colder
- 4
- Daylight
- 10 h 20 min to 10 h 20 minDecember 1 to December 31
- Days at 70°F or more
- 12
- Days at 80°F or more
- 2
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012921; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in San Antonio in December?
On a given December day the chance of 0.01 inch or more is 24% on average, highest around December 11 (24%). In all, 2.00 in falls on 7 days of a normal December.
In a normal December in San Antonio, 4 nights fall to freezing and snowfall averages 0.1 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012921.
How humid and windy is San Antonio in December?
At 3 p.m. the normal temperature is 61°F with 43% relative humidity and a dew point of 38°F; at 6 a.m. it is 45°F with 76% humidity. The wind averages 7.5 mph, most often from the north-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 45°F | 38°F | 76% | 6.1 mph | 40% |
| 9 a.m. | 48°F | 39°F | 70% | 6.9 mph | 31% |
| noon | 57°F | 39°F | 50% | 9.7 mph | 31% |
| 3 p.m. | 61°F | 38°F | 43% | 9.7 mph | 33% |
| 6 p.m. | 57°F | 38°F | 50% | 8.0 mph | 38% |
| 9 p.m. | 51°F | 39°F | 64% | 6.7 mph | 42% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00012921. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in San Antonio?
The warmest December temperature on San Antonio's official record (since 1885) is 90°F, on December 25, 1955; the coldest is 6°F, on December 23, 1989. The wettest December brought 13.96 in (1991); the snowiest, 1.9 inches (2017).
The December mean against the 1991-2020 normal of 53.5°F: 2021 64.2°F (+10.7), 2022 55.4°F (+1.9), 2023 57.1°F (+3.6), 2024 60.9°F (+7.4), 2025 59.3°F (+5.8). 5 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.2°F | +10.7°F | 0.90 in |
| 2022 | 55.4°F | +1.9°F | 0.47 in |
| 2023 | 57.1°F | +3.6°F | 1.11 in |
| 2024 | 60.9°F | +7.4°F | 0.57 in |
| 2025 | 59.3°F | +5.8°F | 0.30 in |
Source: records: ACIS, NWS threaded record SATthr; recent months: ACIS, station USW00012921. Records and recent months use complete months only.
How does December in San Antonio compare across Texas?
Across the 321 places PlainClimate covers in Texas, December normal highs run from 49°F in Dumas to 74°F in Brownsville; San Antonio's is 65°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- San Antonio in November72°F by day, 50°F at night
- San Antonio in January63°F by day, 41°F at night
- San Antonio through the yearEvery month, frost dates, records and recent years
- Texas in DecemberThe statewide normal and the warmest and coolest places
- Brownsville: Texas's warmest Decembernormal high 74°F