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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.
August and September are two of the hottest months in Hawaii. September weather in the Hawaiian Islands can be described as very summer-like with lots of sunshine and warm temperatures. Daytime high temperatures at most beach resorts average in the mid to upper 80s F. Nighttime temperatures only dip into the 70s F.