Galveston / Surfside Texas January?

Bob & Ann wrote:
We are looking at heading from Alabama through New Orleans and Houston to visit friends during late January. We would then drop down to the Galveston / Surfside area for 5-7 days. I have several questions about the Galveston area during late January.
Typically what is the temperature/ weather like?
Is the area typically full with Snow Birds?
Is having reservations important or are the campgrounds empty?
We would then head on over to San Antonio. I would guess that the climate would be the same there. Is this a busy season for San Antonio?
Thanks for your input.

I guess that I really cannot understand why we are getting the responses that we are. We asked about the weather and the crowds during that time of the year. I would appreciate it if we could focus on the questions.
Thanks