Wanderlust World Wanderlust World Hawaii is unequivocally a humid region. The average annual relative humidity hovers around 75%, which is considered high. This moisture-laden air is a direct result of the islands' location in the middle of the vast Pacific Ocean. Persistent trade winds blow warm, moist air across the islands year-round, creating the lush, green landscapes and frequent rain showers (especially on windward slopes) that characterize the Hawaiian environment.