San Antonio weather in December
December is a fair month to visit San Antonio: highs of 17°C (63°F) and about 45 mm (1.8 in) of rain on average. Nights average 5°C (41°F) and cloud cover 55% (NASA POWER, 2001–2025 averages). It is the 2nd driest month of the year and the 2nd coolest. Compared with November, it is cooler and about as wet; January brings highs of 16°C (62°F) and 49 mm (1.9 in) of rain.
Is December a good time to visit San Antonio?
fair month Weather score 73/100.
December is a fair month in San Antonio. The weather is usually best in Feb–Apr, Oct–Nov.
Does it rain a lot in San Antonio in December?
No, it is usually dry: about 45 mm (1.8 in) falls in an average December. It is the 2nd driest month of the year.
How warm is San Antonio in December?
Days average 17°C (63°F) and nights 5°C (41°F).
San Antonio weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 16°C (62°F) | 4°C (39°F) | 49 mm | 55% | fair |
| February | 19°C (66°F) | 6°C (42°F) | 36 mm | 60% | best |
| March | 24°C (74°F) | 10°C (50°F) | 61 mm | 61% | best |
| April | 28°C (82°F) | 14°C (58°F) | 62 mm | 60% | best |
| May | 31°C (88°F) | 19°C (65°F) | 100 mm | 60% | fair |
| June | 34°C (94°F) | 22°C (72°F) | 71 mm | 46% | least pleasant |
| July | 35°C (95°F) | 23°C (73°F) | 71 mm | 44% | least pleasant |
| August | 36°C (96°F) | 24°C (74°F) | 62 mm | 41% | least pleasant |
| September | 32°C (89°F) | 20°C (69°F) | 95 mm | 46% | fair |
| October | 28°C (82°F) | 15°C (59°F) | 78 mm | 41% | best |
| November | 22°C (71°F) | 10°C (49°F) | 49 mm | 50% | best |
| December | 17°C (63°F) | 5°C (41°F) | 45 mm | 55% | fair |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months