San Antonio
Texas, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and Climate
San Antonio, TX

Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront
Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront
December starts the mild winter season in San Antonio with the average temperatures in the 42°F (5.6°C) to 64°F (17.8°C) range. The thermometer dips to freezing on a few nights, and a cold front may even see it below 20°F (-6.7°C). However, the cold rarely persists for longer periods, and snow is almost absent.
December tends to be cloudy at most times with short days as the sunlight reduces to 10 hours.
San Antonio greets snowbirds from the northern and eastern states of America who come in search of a warm Christmas during the winter.
  • The average high temperature in December: 64°F

Warmest months (with the highest average high temperature) are July and August (95°F).
The month with the lowest average high temperature is January (61°F).

  • The average low temperature in December: 41°F

Months with the highest average low temperature are July and August (73°F).
The coldest month (with the lowest average low temperature) is January (37°F).

  • The average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is May (3.7").
Driest months (with the lowest rainfall) are January, March, July and December (1.5").

  • The average rainfall days in December: 7 days

The month with the highest number of rainy days is May (8 days).
Months with the lowest number of rainy days are July and August (5 days).

  • The average daylight in December: 10h

Months with the longest days are May, June and July (Average daylight: 14h).
The month with shortest days is December (Average daylight: 10h).

  • The average sunshine in December: 5h

The month with most sunshine is July (Average sunshine: 10h).
Months with least sunshine are January and December (Average sunshine: 5).

  • The average UV index in December: 4

Months with the highest UV index are May, June, July and August (UV index 11).
Months with the lowest UV index are January and December (UV index 4).