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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).
The Seasons in Hawaii. This is not to say that Hawaii weather is the same every day. Hawaii has a normally drier season during the summer months (May to October), and a rainier season which generally runs during the winter (from November until March).