Hawaii Weather in October

First up on our October in Hawaii review is the weather. Mid-fall is a good time of year, although the islands are slowly entering the rainy season. You might see slightly higher chances for rain, but nothing that would ruin your trip.

Hawaii rains tend to fall mostly at night, so the chances are that you will be sleeping soundly during the showers. Also, if it does rain in the day, the showers tend to be in sudden, short bursts. You can also consider booking your accommodations on the leeward side of the islands, as these spots typically experience fewer showers. The island you choose will also make a difference. Big Island sees the least rainfall, while Kauai sees the most.

Temperatures are perfect hovering in the mid to high 80s range. Evenings are equally pleasant dropping into the 70s. This is preferable to the middle 60s that you might see in the spring and winter months. September and October boast the warmest ocean temperatures, making October ideal for water sports fanatics. Even if you want to dip your toes in the ocean as you are strolling along the beach, you will find the tepid waters are a welcome surprise.  

When traveling throughout the islands, you will see some variations of temperature if you are going into the mountains or climbing the volcanoes. Higher altitudes mean lower temperatures even in Hawaii. You can bring along a jacket, so you aren’t left shivering on your mountain adventures.

The only downside to traveling in October is that it is hurricane season in the Pacific. Although this sounds a little scary, hurricanes and tropical storms rarely hit Hawaii. It’s just good to know it is a possibility when you are planning a trip.

Hawaii Crowds in October

If you want to avoid crowds in summer, October is perfect. It is one of the least traveled times of the year as summer is over, and the holidays are still a few months away. That’s not to say you will encounter massive crowds of people at any other time of the year. It does mean that there is a noticeable drop in tourism in the fall months.

Hawaii Costs in October

October is one of the better times of year to travel to Hawaii for the budget-conscious visitor. Hotel rates are usually below winter holiday pricing, especially if you avoid major event weekends and compare islands before booking. Airfares are harder to predict, but October is generally easier to shop than summer or late December. You can always search for deals online.

Hawaii Events & Highlights in October

October is not just a weather-and-value month. The 2026 fall event calendar is now posted island by island, and several of these are worth building trip dates around:

• IRONMAN World Championship in Kona (October 10): Men and women race the same Kona course on the same day. It is a major event for the Big Island, so book Kona-side rooms and rental cars early — or base on the Kohala Coast, Hilo, or Volcano side during race week. Our IRONMAN week visitor guide covers viewing spots and road-closure planning.
• 99th Maui County Fair (October 1-4): Carnival rides, local food booths, and four nights of Hawaiian music at War Memorial in Wailuku — the most local thing a visitor can do on Maui all fall.
• Hawaii Food & Wine Festival (October 16 - November 8): Three islands, three weekends — Big Island October 16-17, Kaanapali October 23-25, Oahu November 5-8. Ticketed events that sell out; pairs well with our Hawaii for Foodies guide.
• Hawaii International Film Festival (October 22 - November 1): HIFF46 takes over Honolulu theaters with Pacific and Asian premieres — the biggest cultural event on Oahu's October calendar.
• Halloween in Hawaii (October 31): A Saturday in 2026, which means the Waikiki street scene and resort programming run on a fuller calendar than a midweek year.
• Island event calendars: The October island-event pages below cover the rest — night markets, festivals, canoe races, and pumpkin patches per island.

What to Do in Hawaii in October

Start with the water. September and October carry the warmest ocean temperatures of the year, so October is the single best month to prioritize snorkeling, diving, and long beach days — conditions summer visitors pay peak rates for, at shoulder-season prices. On the Big Island, the Kona-side manta ray night snorkel runs year-round and pairs naturally with an IRONMAN-week or coffee-country trip.

October is also a transition month worth watching from shore. The first big northwest swells often reach Oahu's North Shore late in the month — the start of winter surf season — and the season's first humpback whale sightings are typically reported around the same time, though whale watching doesn't ramp up in earnest until winter. Trails and summit drives are usually in good shape before winter storms arrive, and the fall harvest season means farm tours, coffee farms, and pumpkin patches across the islands.

The practical upside of thin October crowds: luaus, small-group tours, and popular restaurants are all easier to book than in summer — with the specific exceptions of Kona during race week and festival-weekend dinners.

October is an excellent month to book your Hawaiian vacation if you want to see pristine weather, reasonable rates, fewer crowds, and many cultural events.