September in Alamo is the rainiest and the cloudiest month of the year. In September, the weather in Alamo is typically hot. Average daily high temperature in September is about 31 degrees above zero. On average, Alamo has 13 rainy, 12 sunny, and 5 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 Alamo.