December in Texas City is the rainiest and the cloudiest month of the year. In December, the weather in Texas City is typically warm. Average daily high temperature in December is about 16 degrees above zero. On average, Texas City has 15 rainy, 9 sunny, 6 partly cloudy, and 1 cloudy day in December. The rains are usually moderate. December as well as July, August, and September is considered the most uncomfortable time to visit Texas City.