August in Texas City is the hottest month of the year. In August, the weather in Texas City is typically hot. Average daily high temperature in August is about 32 degrees above zero. On average, Texas City has 16 rainy, 10 sunny, 4 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Texas City.