In October it will still be hot to quite warm. Expect average temperatures of around 80F / 28C.

Nights can be cooler in Lahaina because the air that has built atop Haleakala (the extinct volcano) during the day tumbles down to the bottom.

Lahaina is usually protected from the trade winds

As you head toward Ka'anapali, at some point the trade winds that you've been protected from in Lahaina will completely wrap around from the other side, making wind a semi-constant companion. That's good if you like cool breezes - bad if you are trying to get your golf ball down the centre of the fairway! It also means the ocean is more susceptible to whitecaps and poor visibility north of Lahaina

Average humidity around the island ranges from 65%-75%

Ocean temperatures average 80F / 28C

Weather websites

http://www.mauiweathertoday.com/ http://www.gohawaii.com/weather/