In August, the weather in Chimaltenango is typically warm. Average daily high temperature in August is about 22 degrees above zero. On average, Chimaltenango has 23 rainy, 5 partly cloudy, 2 sunny, and 1 cloudy day in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Chimaltenango.