In January, San Antonio typically sees daytime highs of 33.4°C and overnight lows around 22.1°C. Compared to the annual average high of 28.9°C, January runs +4.5°C.
January in San Antonio averages a daytime high of 33.4°C and an overnight low of 22.1°C.
January runs +4.5°C compared to San Antonio's annual average high of 28.9°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 33.4°C and cooler evenings around 22.1°C.