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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.
An interesting feature of the climate of Hawaii is the small annual temperature range. In downtown Honolulu, the warmest month is August with an average temperature of about 82 F. The coldest month is February, around 73 F the range between the coldest and warmest months averages only nine degrees.