August in Vigan is the cloudiest month of the year. In August, the weather in Vigan is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Vigan has 26 rainy, 4 cloudy, and 1 partly cloudy day in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Vigan.