Galveston Weather December 2024. December is a winter month. Daily high temperatures decrease by 6°f, from 67°f to 61°f, rarely falling below 49°f or exceeding 76°f.
Get the monthly weather forecast for galveston island state park, tx, including daily high/low, historical averages, to help you plan ahead. Daily high temperatures decrease by 6°f, from 67°f to 61°f, rarely falling below 49°f or exceeding 76°f.