September in Salina Cruz is the rainiest and the cloudiest month of the year. In September, the weather in Salina Cruz is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Salina Cruz has 25 rainy, 3 sunny, and 2 cloudy days in September. The rains are usually heavy. September as well as June, July, and August is considered the most uncomfortable time to visit Salina Cruz.