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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.
Averages for Hawaii in September. The weather in September in Hawaii is warm, sunny and very bright. Though there may be more rain falling than in the previous month of August, September is still well within the peak summer months, offering a wonderful climate for visitors and locals alike.