San Antonio Weather in December
With daytime temperatures of 18°C (64°F) and nighttime lows of 6°C (43°F), December in San Antonio brings pleasant temperatures during the day. It is also the driest month of the year, with minimal rainfall.
Rainfall in San Antonio in December
This is the driest month of the year. Historically, the month has about 8 days of rain, averaging 34 mm (1.3 in) in total. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in San Antonio in December
Temperatures in San Antonio in December top out at 18°C (64°F) and drop to 6°C (43°F) overnight. During December, the winter season is in full swing. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights fall to 6°C (43°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in San Antonio in December
The city usually sees around 151 hours of sunlight, indicating a moderately sunny period.If you prefer dry days with pleasant temperatures, February, March, April, October and November typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Antonio's climate page.
San Antonio Temperature in December
Min Temperature
6°C (43°F)
Max Temperature
18°C (64°F)
Chance of Rain
25%
Precipitation
34 mm (1.3 in)
Rainy days
8 days
Humidity
67%
Sunshine
151 hours
Percentage Sunshine
47%
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 18°C (64°F). Nights are cold, with lows typically ranging from 4°C (39°F) to 9°C (48°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
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in San Antonio.
- On December 30, 2024, temperatures climbed to 32°C (90°F), marking the warmest December day on record.
Best Places in the United States of America in December
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in December →
perfect weather
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tolerable
unpleasant
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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. 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 the United States of America, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Antonio climate overview or explore weather in the United States of America.
