In December, Galveston typically sees daytime highs of 17.1°C and overnight lows around 9.4°C. Compared to the annual average high of 24.1°C, December runs -6.9°C.
December in Galveston averages a daytime high of 17.1°C and an overnight low of 9.4°C.
December runs -6.9°C compared to Galveston's annual average high of 24.1°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 17.1°C and cooler evenings around 9.4°C.