SCUBA diving in Honolulu on 01-03-2023. Better than scuba diving in Hawaii, what could be better? The circumstances for Honolulu scuba diving tours are highly reliable all year long. The average water temperature in Honolulu is around 78 degrees, while the surface temperature is about 84 degrees. The fact that Honolulu’s underwater visibility is often between 50 and 100 feet is another fantastic aspect of the city’s ocean. Experience Honolulu’s warm, clear waters by diving with us.