There is also a view that, because it is highly humid and moldy in this season it have been called "黴雨" (read as 'baiu') and it was changed to "梅雨" which has same sound "baiu."
この時期は湿度が高く黴（カビ）が生えやすいことから「黴雨（ばいう）」と呼ばれ、これが同じ音の「梅雨」に転じたという説もある。