In August, the weather in Oberammergau is typically warm. Average daily high temperature in August is about 21 degrees above zero. On average, Oberammergau has 17 rainy, 8 sunny, 4 partly cloudy, and 2 cloudy days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Oberammergau.