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Weather in Hawaii in October. Average high temperatures in Hawaii in October hover in the mid to upper 80â²s, with lows in the mid 70â²s. You can expect cooling tradewind breezes most of the time, although weather patterns change quite frequently.
Anytime of year is a good time to visit Hawaii Island. At sea level, the average summer temperature is 85 degrees Fahrenheit, 78 degrees Fahrenheit in the winter. Trade winds keep things comfortable year-round.