September in San Juan de Alicante is the rainiest and the cloudiest month of the year. In September, the weather in San Juan de Alicante is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, San Juan de Alicante has 12 sunny, 9 rainy, and 9 partly cloudy days in September. The rains are usually moderate. September as well as January, February, March, and November is considered the most uncomfortable time to visit San Juan de Alicante.