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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.
Beach Weather. In most areas of Hawaii, however, the temperature ranges are much smaller. At the beaches the average daytime high in summer is in the mid-eighties, while in winter the average daytime high is still in the high seventies. The temperatures drop about ten degrees at night.