September in San Francisco de Campeche is the rainiest and the cloudiest month of the year. In September, the weather in San Francisco de Campeche is typically hot. Average daily high temperature in September is about 31 degrees above zero. On average, San Francisco de Campeche has 27 rainy and 3 sunny days in September. The rains are usually heavy. September as well as June, July, and August is considered the most uncomfortable time to visit San Francisco de Campeche.