August in Oaxaca de Juárez is the rainiest month of the year. In August, the weather in Oaxaca de Juárez is typically warm. Average daily high temperature in August is about 19 degrees above zero. On average, Oaxaca de Juárez has 30 rainy and 1 sunny day in August. The rains are usually heavy. August as well as June, July, September, and October is considered the most uncomfortable time to visit Oaxaca de Juárez.