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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.
While itâs impossible to predict the weather, know that annual trends in Hawaiiâs average temperatures arenât that different from the rest of the country: Warmer temperatures come during the traditional summer months of June through September, while the winter season of December to February means cooler climes.