San Antonio Weather in December
San Antonio in December averages 19°C (66°F) during the day and 11°C (52°F) at night. December is part of the rainy season, so frequent rainfall is typical.
Rainfall in San Antonio in December
San Antonio is in the rainy season in December, with rain on around 13 days and an average of 338 mm (13 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.
Temperature in San Antonio in December
December in San Antonio brings typical temperatures with highs around 19°C (66°F) and lows of 11°C (52°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in San Antonio in December
There are approximately 216 hours of sunshine this month, despite being the rainy season. Rain often arrives in the late afternoon or evening, keeping mornings and early afternoons sunny. Even during the wet season, it could still be a nice time to visit.
Wind Speed in San Antonio in December
Average wind conditions reach () in December. This results in mostly calm, still weather and is ideal for most activities. While this is an average, conditions can vary slightly from completely calm to occasionally breezy days.December in San Antonio has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations 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 Ecuador, check out our San Antonio's climate page.
San Antonio Temperature in December
Min Temperature
11°C (52°F)
Max Temperature
19°C (66°F)
Chance of Rain
42%
Precipitation
338 mm (13 in)
Rainy days
13 days
Humidity
81% *
Windspeed
() *
Sunshine
216 hours *
Percentage Sunshine
*
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 19°C (66°F). Nights are cool, with lows around 10°C (50°F).
Average temperatures 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 weather observations in San Antonio between 1998 and 2025, these are the recorded extremes during December.
- San Antonio recorded its highest December temperature of 28°C (82°F) on December 27, 2015.
- The coldest December day was on December 16, 2002, with a maximum of 12°C (54°F).
- San Antonio registered its coldest December night on December 5, 2025, with temperatures dropping to 3°C (37°F).
Best Places in Ecuador in December
Find out more about the weather in Ecuador and which places have the best travel conditions in this month. See all of Ecuador in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Antonio in December
For San Antonio in December, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What 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 Ecuador, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full San Antonio climate overview or explore weather in Ecuador.
