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Save this Post. 2. Re: September weather in Maui & how many days. Dec 11, 2009, 12:50 PM. Weather in Sept. is generally very warm. Upper 80's. Not part of the rainy season, unless of course, there is a hurricane lurking around somewhere. I recommend at least 10 days.
These months on Maui are the pinnacles of summer heat. This is often the most humid of the summer months. Maui ocean water temperatures are from 79 to 80 degrees Fahrenheit. Maui air temperatures are from 70-80 degrees F depending on the area.