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.