Weather in San Antonio in December
December in San Antonio is cool with average temperatures around 11.7°C (53.1°F). Light rainfall with only 45mm expected.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
18.0°C
64.4°F
Low
5.5°C
41.9°F
Precipitation
45 mm
1.8 inches
~6 rainy days
Conditions
Humidity
69%
Comparison to Adjacent Months
December is 4.6°C cooler than November.