August in Corpus Christi is the hottest month of the year. In August, the weather in Corpus Christi is typically hot. Average daily high temperature in August is about 34 degrees above zero. On average, Corpus Christi has 14 sunny, 12 rainy, and 5 partly cloudy days in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Corpus Christi.