December weather forecast
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

Weather in December

The first month of the winter, December, is also an enjoyable month in San Antonio, Texas, with an average temperature fluctuating between 62.4°F (16.9°C) and 46.9°F (8.3°C).

Temperature

In December, the average high-temperature slightly decreases from an agreeable 69.8°F (21°C) in November to an enjoyable 62.4°F (16.9°C). In San Antonio, in December, the average low-temperature is 46.9°F (8.3°C).

Humidity

In San Antonio, Texas, the average relative humidity in December is 69%.

Rainfall

In San Antonio, during December, the rain falls for 9.9 days and regularly aggregates up to 1.1" (28mm) of precipitation. In San Antonio, during the entire year, the rain falls for 144.5 days and collects up to 22.6" (574mm) of precipitation.

Snowfall

January, February and December are months with snowfall in San Antonio. December is the first month it typically snows in San Antonio. Throughout December, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In San Antonio, during the entire year, snow falls for 0.7 days and aggregates up to 0.2" (5mm) of snow.

Daylight

With an average of 10h and 18min of daylight, December has the shortest days of the year in San Antonio.
On the first day of December, sunrise is at 7:10 am and sunset at 5:35 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:45 pm CST.

Sunshine

With an average of 5.3h of sunshine, December has the least sunshine of the year.

UV index

With an average maximum UV index of 3, December is the month with the lowest UV index in San Antonio. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 in December interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in San Antonio?

The average high-temperature, in December, is 62.4°F (16.9°C), while the average low-temperature is 46.9°F (8.3°C). in October, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, is computed to be 84.2°F (29°C).

What is the average humidity in December in San Antonio?

In San Antonio, Texas, the average relative humidity in December is 69%.

How much does it rain in San Antonio in December?

In San Antonio, during December, the rain falls for 9.9 days and regularly aggregates up to 1.1" (28mm) of precipitation.

When does it start to snow in San Antonio?

December is the first month it typically snows. Throughout December, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

What is the month with the shortest days in San Antonio?

The month with the shortest days in San Antonio is December, with an average of 10h and 18min of daylight.

What is the average length of the day in December in San Antonio?

In San Antonio, Texas, the average day length in December is 10h and 18min.

When are sunrise and sunset in December in San Antonio?

In December, on the first day of the month, sunrise is at 7:10 am and sunset at 5:35 pm. On the last day of the month, in San Antonio, sunrise is at 7:28 am and sunset at 5:45 pm CST.

What is the month with the least sunshine in San Antonio?

December has the least sunshine of the year in San Antonio, with an average of 5.3h of sunshine.

How many hours of sunshine does San Antonio have in December?

In December, the average sunshine duration in San Antonio, Texas, is 5.3h.

When is the lowest UV index in San Antonio?

The month with the lowest UV index in San Antonio is December, with an average maximum UV index of 3.

How high is the UV index in December in San Antonio?

In San Antonio, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
San Antonio, TX

Average temperature in December - San Antonio, TX
  • Average high temperature in December: 62.4°F

The warmest month (with the highest average high temperature) is August (96.6°F).
The month with the lowest average high temperature is January (61.7°F).

  • Average low temperature in December: 46.9°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).

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Average pressure in December
San Antonio, TX

Average pressure in December - San Antonio, TX
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in December
San Antonio, TX

Average wind speed in December - San Antonio, TX
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is May (9mph).
The calmest month (with the lowest average wind speed) is September (6.5mph).

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Average humidity in December
San Antonio, TX

Average humidity in December - San Antonio, TX
  • Average humidity in December: 69%

The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (59%).

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Average rainfall in December
San Antonio, TX

Average rainfall in December - San Antonio, TX
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is February (0.98").

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Average rainfall days in December
San Antonio, TX

Average rainfall days in December - San Antonio, TX
  • Average rainfall days in December: 9.9 days

The month with the highest number of rainy days is September (17 days).
The month with the least rainy days is January (9.1 days).

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Average snowfall in December
San Antonio, TX

Average snowfall in December - San Antonio, TX
  • Average snowfall in December: 0.04"

The months with the highest snowfall are January and February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
San Antonio, TX

Average snowfall days in December - San Antonio, TX
  • Average snowfall days in December: 0.1 days

The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in December /
Average sunshine in December
San Antonio, TX

Average daylight in December / Average sunshine in December - San Antonio, TX
  • Average daylight in December: 10h and 18min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

  • Average sunshine in December: 5h and 18min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

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Average sunshine days in December
San Antonio, TX

Average sunshine days in December - San Antonio, TX
  • Average sunshine days in December: 19 days

The month with the most sunshine days is January (20.3 days).
The months with the least sunshine days are May and September (11.8 days).

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Average UV index in December
San Antonio, TX

Average UV index in December - San Antonio, TX
  • Average UV index in December: 3

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in December
San Antonio, TX

Average cloud cover in December - San Antonio, TX
  • Average cloud cover in December: 41

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 23).

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Average visibility in December
San Antonio, TX

Average visibility in December - San Antonio, TX
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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