The weather ratio in May in Tokyo (Japan) comprises 32% clear and sunny days, 26% partly cloudy days, 6% cloudy days, and 35% rainy days. There is a lot of rain in Tokyo in May. The average temperature in Tokyo in May is 22°C. The highest temperature is 22°C, the lowest temperature is 17°C, and the temperature doesn't change much. It's a place at which on cloudy days, the cloud coverage is neither too great nor too slight, It is, on average, a windy place.