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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.
The average daytime summer temperature at sea level is 85 degrees F. (29.4 C), while the average daytime winter temperature is 78 degrees (25.6 C). Temperatures at night are approximately 10 degrees F. lower. However, at higher elevations, temperatures can drop dramatically. Hawaii Island is an incredible collection of many diverse micro-environments, each with its own weather.