August in Haguenau is the sunniest month of the year. In August, the weather in Haguenau is typically warm. Average daily high temperature in August is about 23 degrees above zero. On average, Haguenau has 16 sunny, 9 partly cloudy, and 6 rainy days in August. The rains are usually light. August as well as September is considered the most comfortable time to visit Haguenau.