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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.
Average monthly weather in Honolulu, Hawaii. 1  Honolulu experiences a mostly dry summer season. Itâs summer between months May and October and becomes winter between October and April. 2  For more information, see the weather forecast and our average climate infomation (by month in graphs) below. * Data from nearest weather station: Honolulu, Hawaii (0.0 KM).