San Antonio Weather in December
During December, San Antonio experiences moderate daytime temperatures of 17°C (63°F) and cooler nights around 12°C (54°F). As part of the winter season, some rainfall is to be expected.
Rainfall in San Antonio in December
The climate data from previous years indicates about 13 days of rain, averaging 39 mm (1.5 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in San Antonio in December
If you're visiting San Antonio in December, expect highs of 17°C (63°F) and overnight lows around 12°C (54°F). The winter season takes place during December. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to around 12°C (54°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in San Antonio in December
The month experiences a moderate amount of sunlight, with 152 hours of sunshine. This provides a nice balance between sunshine and clouds.
Average water temperature in December
The water is 17°C (63°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.December in San Antonio can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Antonio's climate page.
San Antonio Temperature in December
Min Temperature
12°C (54°F)
Max Temperature
17°C (63°F)
Water Temperature
17°C (63°F) *
Chance of Rain
44%
Precipitation
39 mm (1.5 in)
Rainy days
13 days
Humidity
74% *
Sunshine
152 hours *
Percentage Sunshine
55% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Antonio typically stay consistent throughout December, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 11°C (52°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for San Antonio in December
Browse day-by-day weather records for San Antonio spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Antonio historical weather extremes in December
Our historical data for San Antonio spans 1976 to 2025, revealing these weather extremes.
- On December 14, 1981, temperatures climbed to 23°C (73°F), marking the warmest December day on record.
- The lowest daytime temperature in December was 9°C (48°F), recorded on December 19, 2009.
- Nighttime temperatures dropped to 1°C (34°F) on December 20, 2009, marking the coldest December night on record.
Best Places in Spain in December
Find out more about the weather in Spain and which places have the best travel conditions in this month. See all of Spain in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Antonio in December
Comfortable temperatures call for an easy wardrobe in December. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Light rain is possible, so consider bringing a small umbrella or rain jacket. Expect water temperatures of around 17°C (63°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in San Antonio in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full San Antonio climate overview or explore weather in Spain.
