In January, San Antonio typically sees daytime highs of 22.8°C and overnight lows around 11.9°C. Compared to the annual average high of 18.7°C, January runs +4.1°C.
January in San Antonio averages a daytime high of 22.8°C and an overnight low of 11.9°C.
January runs +4.1°C compared to San Antonio's annual average high of 18.7°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 22.8°C and cooler evenings around 11.9°C.