Maui Weather in September
Maui, Hawaii, USA
Pick your travel dates to see the odds.
September holds close to August's warmth, with highs of 79°F, lows of 69°F, rain easing slightly to 16.2 days, and humidity steady at 74%.
Sea temperature peaks for the year at 82°F, making September arguably the best month for swimming, snorkeling and any water-based activity.
September falls within Central Pacific hurricane season, and the short storm record for this island shows a storm day in September, worth a close check of the forecast in the week before a trip.
Crowds thin out noticeably after Labor Day as US mainland schools return, making September a strong value window with summer-quality weather and lighter tourist traffic.
This shoulder-season lull makes it easier to book popular experiences like Road to Hana, Molokini snorkel trips, or Haleakalā sunrise without the summer's advance-booking pressure.
Whale watching remains unavailable, with the humpback population still up in Alaska; the first early arrivals back to Maui waters typically don't appear until October or November.
Surf on the north shore starts building again toward the end of the month as the winter swell season approaches, a preview of what's ahead through the fall and winter.
Pack summer clothing and strong sun protection, and take advantage of the warmest water of the year while crowds are lighter than midsummer.
Frequently asked questions
Is September a good time to visit Maui?
Yes, it combines the warmest sea temperature of the year with noticeably lighter crowds after Labor Day.
Is there hurricane risk in Maui in September?
Some, the short storm record for this island shows a storm day in September, so check the forecast close to your trip.
Is the ocean warm in Maui in September?
Yes, at its yearly peak of 82°F, the best month of the year for swimming and snorkeling.
Is Maui less crowded in September?
Yes, crowds thin out noticeably after Labor Day as mainland US schools return.
Can you see whales in Maui in September?
No, the humpback population remains in Alaska; the first arrivals back typically appear in October or November.
Weather data by Open-Meteo.com (CC BY 4.0) and the NOAA National Hurricane Center. Data updated September 2026. How we calculate.