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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.
The temperature drops as you gain elevation on the island's mountains. At 6960 feet (2120 metres) at the Heleakala National Park Visitor Center the temperature averages 20 degrees Fahrenheit (11 degrees Celsius) cooler than at the beach. For individual places on Maui, average temperatures are also available by month.