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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.
Averages for Hawaii in September. The weather in September in Hawaii is warm, sunny and very bright. Though there may be more rain falling than in the previous month of August, September is still well within the peak summer months, offering a wonderful climate for visitors and locals alike.