Hawaii's rainy season lasts almost half of the year, as it lasts from November through March. Because Hawaii is located at the edge of a tropical zone, it only has two seasons — dry season and rainy season.
Whether it is dry season or rainy season, it is rare that it doesn't rain somewhere in Hawaii on any given day. Hawaii sees the most rain during the month of December, in which the average amount of precipitation is about 4 inches for the month. The least amount of rain falls in June, when less than half an inch falls for the month.