San Antonio weather in December
Temperature, rain and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Excellent
Best time to visit: October – April
What is the weather like in San Antonio in December?
In December, San Antonio is mild: daytime highs average 18 °C, and nights cool down to about 8 °C. Expect around 5 hours of sunshine a day. Rain falls on about 6 days, adding up to 42 mm. All in all, December is an excellent month for a holiday in San Antonio.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 82 | 80 | 77 |
| Day | 22° | 18° | 17° |
| Night | 12° | 8° | 7° |
| Sun | 5 h | 5 h | 5 h |
| Rain days | 7 | 6 | 6 |
More details for December
- Daylight
- 10 h 17 min07:21 – 17:37
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 53 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−6America/Chicago
How the score comes together
- Temperatureweight 50 %99 %
- Sunshineweight 20 %30 %
- Few rainy daysweight 30 %83 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Sunscreen
- A jumper for the evenings
San Antonio in December: quick answers
Is San Antonio hot in December?
No. In December, San Antonio is mild: daytime highs average 18 °C and nights drop to about 8 °C.
Does it rain much in San Antonio in December?
Rain falls on about 6 days, adding up to 42 mm.
San Antonio month by month
The whole year in San AntonioAll destinations: USAWhere to go in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences