September in Corpus Christi is the rainiest month of the year. In September, the weather in Corpus Christi is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Corpus Christi has 14 rainy, 14 sunny, and 2 partly cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most uncomfortable time to visit Corpus Christi.