September in San Lucas Sacatepéquez is the rainiest and the cloudiest month of the year. In September, the weather in San Lucas Sacatepéquez is typically warm. Average daily high temperature in September is about 24 degrees above zero. On average, San Lucas Sacatepéquez has 27 rainy, 2 partly cloudy, and 1 cloudy day in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit San Lucas Sacatepéquez.