January in San Antonio averages a daily high of 17.9°C with nights around 4.4°C. Expect roughly 7.9 wet days totalling 51.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit San Antonio is February–April.
Based on SAN ANTONIO INCARNATE WORD, TX US (5.5km), 1995–2024. 23 years of January data.