August in Manitowoc is the sunniest month of the year. In August, the weather in Manitowoc is typically warm. Average daily high temperature in August is about 24 degrees above zero. On average, Manitowoc has 19 sunny, 10 partly cloudy, and 2 rainy days in August. The rains are usually light. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Manitowoc.