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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.
Hawaii: Annual Weather Averages. August is the hottest month in Hawaii with an average temperature of 27Â°C (80Â°F) and the coldest is January at 23Â°C (73Â°F) with the most daily sunshine hours at 11 in July. The wettest month is November with an average of 124mm of rain.