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Weather in Hawaii in September. The average maximum daytime temperature in Hawaii in September is a hot 30Â°C (86Â°F) with high heat & humidity. There are usually 9 hours of bright sunshine each day, which represents 74% of the 12 hours of daylight. The average sea temperature in and around Hawaii in September is 27Â°C (81Â°F).
Hawaii's climate is typical for the tropics, although temperatures and humidity tend to be less extreme because of near-constant trade winds from the east. Summer highs usually reach around 88 Â°F (31 Â°C) during the day, with the temperature reaching a low of 75 Â°F (24 Â°C) at night.