In January, San Antonio typically sees daytime highs of 16.9°C and overnight lows around 4.2°C. Compared to the annual average high of 26.8°C, January runs -9.9°C.
January in San Antonio averages a daytime high of 16.9°C and an overnight low of 4.2°C.
January runs -9.9°C compared to San Antonio's annual average high of 26.8°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 16.9°C and cooler evenings around 4.2°C.