August in Fukushima is the warmest month of the year. In August, the weather in Fukushima is typically warm. Average daily high temperature in August is about 27 degrees above zero. On average, Fukushima has 18 rainy, 7 partly cloudy, 4 cloudy, and 2 sunny 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 Fukushima.