August in Tokyo is the hottest month of the year. In August, the weather in Tokyo is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Tokyo has 15 rainy, 8 sunny, 5 partly cloudy, and 3 cloudy days in August. The rains are usually heavy. August as well as February, March, June, and July is considered the most uncomfortable time to visit Tokyo.