入梅(にゅうばい) - nyubai

Japan has a rainy season, which is called tsuyu in Japanese, between spring and summer. Nyubai refers to the first day of the rainy season. Nyubai falls around the 10th of June on the calendar today.

梅雨(つゆ)の始まりに当たる日。新暦では6月10日頃。