San Antonio, TX weather in December
Expect cool weather with some rain in San Antonio in December, with highs near 65°F and lows near 42°F. Rain falls on about 8 days. It is one of the coolest months in San Antonio. Good for outdoor plans.
- Normal high
- 65°F
- Normal low
- 42°F
- Wet days
- 8
- 2.0 in total
- Muggy days
- 1
- dew point 65°F+
How December changes from start to finish
| December 1 | December 31 | |
|---|---|---|
| Normal high | 67°F | 63°F |
| Normal low | 45°F | 41°F |
| Chance of a wet day | 23% | 23% |
| Sunrise / sunset | 7:11 am / 5:34 pm | 7:28 am / 5:45 pm |
| Daylight | 10.4 h | 10.3 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical December day
- 6 am47°Fdew point 42°F
- 9 am51°Fdew point 43°F
- Noon60°Fdew point 43°F
- 3 pm64°Fdew point 43°F
- 6 pm59°Fdew point 43°F
- 9 pm53°Fdew point 43°F
NOAA hourly normals (local standard time) from San Antonio Kelly AFB (6 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more1 of 31
- Wet daysat least 0.01 in of rain or melted snow8 of 31
- Notable rainat least 0.10 in3 of 31
- Freezing nightslow 32°F or below4 of 31
Average days per December, counted from daily records for each year 1991-2020.
Rain and snow in December
Normal precipitation is 2.0 in; a dry December brings about 0.4 in and a wet one about 2.5 in (25th and 75th percentiles). About 1 day brings half an inch or more. Normal snowfall is 0.1 in.
How December varies from year to year
- Warmest December, 1991-20202015: average high 70°F
- Coolest December2000: average high 56°F
- Wettest December1991: 14.0 in
- Driest December2004: 0.08 in
- Highest reading86°F (December 3, 2013)
- Lowest reading18°F (December 19, 1996)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
December compared with November and January
| November | December | January | |
|---|---|---|---|
| Normal high | 72°F | 65°F | 63°F |
| Normal low | 50°F | 42°F | 41°F |
| Wet days | 6 | 8 | 7 |
| Comfortable days | 15 | 14 | 13 |
| Daylight | 10.7 h | 10.3 h | 10.5 h |
Highs change by -7°F from November and -2°F into January.
Nearby alternatives in December
- Warmer: McAllen, TX223 mi · high 74°F · 6 wet days
- Drier: San Angelo, TX182 mi · high 62°F · 4 wet days
- Cooler: Abilene, TX222 mi · high 59°F · 5 wet days
How San Antonio ranks in December
- Normal high79th warmest of 378 cities; 14th of 38 in Texas
- Wet days128th driest of 378
- Comfortable days41st most of 340
Heating and cooling
December has 369 heating degree days and 14 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How cold is San Antonio in December?
The normal high is 65°F and the normal low is 42°F. From 1991 to 2020 the coldest December reading was 18°F (December 19, 1996).
Does it rain a lot in San Antonio in December?
About 8 days in December have at least 0.01 in of precipitation, and the normal total is 2.0 in. The wettest December in 1991-2020 was in 1991 (14.0 in); the driest was in 2004 (0.08 in).
Does it snow in San Antonio in December?
Yes. Normal snowfall in December is 0.1 in.
Is December a good time to visit San Antonio?
December ranks 4th of 12 months on our comfort score for San Antonio (63 out of 100). It has about 14 comfortable days. The best months are February, March and November.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: San Antonio Intl Airport (USW00012921), 8.3 mi N of the city center, 789 ft (140 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: San Antonio Kelly AFB (USW00012909), 6.1 mi WSW of the city center, 682 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Antonio International Airport (722530-12921), 8.3 mi N of the city center, 799 ft (150 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).