梅雨

Today is the official first day of 梅雨 (the rainy season) in Tokyo.

It didn’t rain at all today, though.
It is forecast to rain tomorrow in Tokyo…but not the rest of the week.

Weather forecast for 2009 June 11 - 17.

The rainy season in Japan starts this time of year (mid-June) and lasts a few weeks.
北海道 (Hokkaido (Japan’s northernmost island)) doesn’t have a 梅雨 (rainy season).