If you’re planning a Hawaii trip around Halloween, you’ll get warm days, mild nights, and fewer crowds than in summer. Expect daytime temperatures in the low to mid-80s Fahrenheit, with evenings cooling off into the upper 60s or low 70s.
Rain chances pick up a bit in late October as the islands move toward the wetter season, but most showers are quick and clear out fast.
Weather really depends on the island you pick. Windward coasts like Hilo on the Big Island get more rain, while leeward spots such as Honolulu and much of Maui stay sunnier and drier.
The ocean stays warm, averaging 79–80°F, so swimming, snorkeling, and surfing are still great options.
Late October offers some unique seasonal treats. You might spot migrating humpback whales arriving offshore, and you can check out fall festivals or cultural events with a tropical twist.
This combo of steady weather, warm water, and local traditions makes Halloween in Hawaii feel pretty special.
Typical Weather in Hawaii During Late October
Late October brings warm days, mild nights, and a mix of sun with passing showers. Trade winds blow steadily, ocean temperatures stay comfortable, and days get a bit shorter as the wet season approaches.
Average Temperatures Around Halloween
Daytime highs usually hit the low to mid-80s °F (about 27–29°C). Nights cool down into the low 70s °F (around 21–23°C), so evenings are nice for outdoor dinners or beach walks.
The water stays warm, around 78–80°F (25–27°C). You won’t need a wetsuit for swimming or snorkeling.
Because of Hawaii’s tropical climate, the difference between day and night temps isn’t huge. The steady trade winds help keep things from getting too hot, even in the afternoon sun.
Rainfall Patterns and Humidity
October marks the shift from the dry season (Kau) to the wet season (Hooilo). Rainfall goes up a bit compared to summer, but showers usually stay short and local.
You’ll probably see around 8–9 rainy days this month. Most showers come at night or early morning, so days are often dry.
Rain falls more on the windward sides, while leeward areas usually stay sunny.
Humidity stays moderate. The trade winds keep air moving and make things comfortable.
In sheltered valleys or when the wind dies down, you might feel a little sticky, but overall it’s not bad.
Daylight Hours and Sunset Timing
By late October, you get about 11.5 hours of daylight each day. Sunrise happens around 6:30 a.m., and sunset is close to 6:00 p.m.
Since the sun sets earlier than in summer, evenings come on fast, so plan outdoor stuff earlier. The shorter days actually set up some amazing sunsets, especially when clouds linger after a quick shower.
Even with less daylight, you’ve still got plenty of time for the beach, hikes, or sightseeing before dark.
Regional Weather Differences Across the Hawaiian Islands
Weather shifts a lot from one Hawaiian island to another, thanks to geography, elevation, and wind. Conditions can change pretty fast even over a few miles.
Oahu and Honolulu
On Oahu, weather depends on whether you’re on the windward or leeward side. The Honolulu area, on the leeward coast, is usually drier and sunnier.
Around Halloween, expect daytime highs near 82–84°F and nighttime lows in the upper 60s to low 70s.
The windward side—think Kailua or Kaneohe—gets more rain because of moist trade winds hitting the Koolau Mountains. Showers pop up often, but they don’t last long.
Humidity averages 60–70%, but those trade winds keep it from feeling muggy. If you’re planning outdoor activities in Honolulu, rain probably won’t mess with your plans as much as on the east side.
Maui, Molokini Crater, and Lanai
Maui’s weather changes quickly depending on where you are. Coastal spots like Kahului see highs of 83–85°F and lows near 70°F around Halloween.
The leeward side stays pretty dry, while windward slopes of Haleakala get more showers.
If you’re headed to Molokini Crater, count on dry, sunny mornings with calm seas. Winds tend to pick up later, so early snorkeling is your best bet.
Lanai is even drier than Maui. Leeward beaches get less than 25 inches of rain a year.
In late October, you’ll find warm afternoons and cooler evenings, especially up in the hills where temps can dip into the mid-60s.
Big Island and Mauna Kea
The Big Island has the most varied climate in Hawaii. Hilo, on the windward side, is one of the wettest places in the U.S., getting over 130 inches of rain annually.
Around Halloween, expect frequent showers, with highs near 81°F and lows in the upper 60s.
Kona on the leeward side is way drier, with less than 25 inches of rain per year. Late October here means warm, sunny days and highs around 84°F.
At the top of Mauna Kea, over 13,000 feet up, it’s a whole different world. Temperatures can drop to freezing, and strong winds are common. Snow sometimes falls up there, even when the beaches below are warm.
Kauai and Microclimates
Kauai is the rainiest Hawaiian island. The center peak, Mount Waialeale, gets nearly 486 inches of rain annually, which is just wild.
But coastal areas like Poipu on the south shore are much drier.
Around Halloween, daytime highs average 80–82°F, with nighttime lows in the upper 60s.
Rain is more likely on the north and east coasts, while the south and west usually stay sunnier.
Kauai has tons of microclimates. You can drive from a rainy valley to a sunny beach in 20 minutes.
If you want reliable sun, stick to the leeward side in late October.
Transition from Dry Season to Wet Season
Hawaii’s climate starts shifting in late October as the islands move from dry months toward wetter ones. Temperatures stay warm, but rainfall patterns change, and you’ll want to factor that into your plans.
When Does the Wet Season Start?
Hawaii has two seasons: the dry season (kau) from May to October, and the wet season (hooilo) from November through April.
The change isn’t instant, but late October is when you’ll notice the switch.
Rainfall is lower during the dry season, especially on leeward sides. The wet season brings more showers, mostly on windward slopes where trade winds push clouds up against the mountains.
In real life, October feels mostly dry at the start. By the end, you’ll notice more passing showers—usually quick, but a sure sign wetter months are coming.
Weather Shifts in Late October
October temps along the coast usually run from 74°F to 85°F (23°C to 29°C). The ocean stays warm, so swimming and snorkeling are still comfortable.
Rainfall averages about 3.3 inches in October, which is up from less than 2 inches in peak summer. Afternoon and evening showers become more common, especially at higher elevations and on windward sides of islands like Oahu and Maui.
Humidity ticks up a bit, but the northeast trade winds still bring relief and keep it from feeling stifling.
You’ll still see plenty of sunny days, but you should be ready for quick, scattered showers that can show up out of nowhere.
Effects on Outdoor Activities
This late-October shift affects your plans. Hiking trails can get muddy, especially in lush places like Kauai’s Na Pali Coast or Maui’s Hana region.
If you’re headed to rainforests or waterfalls, bring light rain gear.
Beach activities stay popular since the ocean is warm and usually calm. The wet season also lines up with the start of Hawaii’s big wave surf season, especially on Oahu’s North Shore, where swells start building.
Cultural events and sightseeing usually go on, even if showers pass through. Most rain clears quickly, leaving blue skies.
Still, it’s smart to keep your schedule flexible in case of heavier downpours, especially if you’re driving far or booking outdoor tours.
Ocean Conditions and Beach Activities
In late October, the Pacific around Hawaii stays plenty warm for swimming, but surf, currents, and visibility start to shift. It all depends on which island and which beach you pick—calm leeward spots or north-facing surf breaks offer totally different experiences.
Sea Temperatures and Swimming
Water temps near Halloween average about 78–80°F (25–27°C). That’s warm enough to skip the wetsuit, and lots of visitors spend hours in the ocean.
The sea stays warmer than most mainland U.S. beaches this time of year.
Trade winds keep air and water feeling fresh, but they can stir up a little chop in open spots.
Sheltered leeward beaches, like those near Kona or Waikiki, usually offer calmer waters.
If you plan to swim, always check for lifeguard warnings. Even with warm water, rip currents can pop up fast, especially on exposed beaches.
Surf and Snorkeling Conditions
Late October kicks off the north shore surf season. Swells start rolling into Oʻahu’s North Shore, Maui’s Honolua Bay, and other north-facing coasts.
These waves draw experienced surfers, but they can make swimming risky for beginners.
On southern and leeward coasts, surf usually stays smaller and easier to handle—better for families or less confident swimmers.
Snorkeling at places like Hanauma Bay or Molokini Crater is usually clear in October, though rain can mess with visibility. Mornings are best for snorkeling since winds are lighter and the surface is calmer.
Waikiki Beach and Popular Spots
Waikiki Beach on Oʻahu stays pretty mellow in October compared to the north shore. The gentle rolling waves are great for beginner surf lessons or paddleboarding.
The water is warm, and lifeguards keep an eye on things every day.
Nearby spots like Ala Moana Beach Park have protected lagoons with shallow water—perfect for wading or swimming with kids.
These beaches are popular with locals and visitors alike, especially families.
If you want to mix beach time with shopping or sightseeing, Waikiki’s central location makes it super convenient. You’re never far from restaurants, shops, or cultural attractions, so it’s an easy pick for late October ocean fun.
Wildlife and Natural Events Around Halloween
During late October, you’ll spot some changes in Hawaii’s ecosystems, both in the ocean and on land.
Marine life starts shifting as large migratory species arrive, and the tropical rainforests respond to the turn from dry to wet months.
Humpback Whales and Marine Life
Humpback whales start their migration from Alaska to Hawaii in the fall. By late October, you might spot a few early arrivals, especially near Maui, but the real peak comes later in winter.
These whales swim thousands of miles to breed and give birth in warm, shallow waters.
You’ll also notice more activity from green sea turtles and spinner dolphins since they stick around all year. Coral reefs stay vibrant, and the water stays warm enough for snorkeling or diving if you’re up for it.
Shoreline conditions shift depending on the island and which coast you’re on. The north-facing shores get bigger swells as winter approaches, drawing surfers but making swimming a bit rougher.
On the leeward sides, the seas stay calmer, so you’ll find safer spots for watching reef fish and other marine life.
Tropical Rainforest Changes
In October, Hawaii’s tropical rainforests start moving into their wetter season. Rain picks up on the windward slopes, especially around Hilo on the Big Island or in the valleys of Kauai.
This extra moisture keeps the vegetation lush, and you’ll see ferns, orchids, and native trees thriving in all that dampness.
Waterfalls run stronger as streams fill from the frequent showers. Trails in these rainforest areas can get muddy and slippery, so you’ll want sturdy shoes if you plan to hike.
You’ll hear wildlife like Hawaiian honeycreepers and other native birds staying active, feeding on blossoms and insects. The higher humidity brings more insects too, which are a big deal for pollination and the whole forest food chain.
Rainforest conditions don’t stay the same everywhere. Within just a few miles, you can go from heavy downpours on windward slopes to drier, sunnier weather on leeward lowlands.
This contrast is honestly one of the coolest things about Hawaii’s microclimates in late October.
Travel Tips and Festivals in Late October
Late October in Hawaii means warm days, cooler evenings, and a mix of cultural events that show off the islands’ traditions. You should plan for light rain showers, get ready for outdoor activities, and enjoy smaller crowds compared to the summer rush.
Packing Recommendations
You’ll want clothes that work for warm days and cooler nights. Lightweight shirts, shorts, and swimwear are perfect for daytime, but a light sweater or jacket helps when the temperature drops into the low 70s °F in the evening.
Brief showers pop up pretty often, so bring a compact rain jacket or poncho. Quick-dry fabrics come in handy if you’re hiking or spending time outside after a rain.
Don’t forget comfortable shoes. Sandals work for the beach, but you’ll need sturdy shoes for trails like those in Volcanoes National Park or Waimea Canyon.
A packing list for late October might look like this:
- Light layers (t-shirts, shorts, sundresses)
- Light sweater/jacket for evenings
- Rain protection (poncho or umbrella)
- Swimwear and reef-safe sunscreen
- Comfortable shoes (sandals + hiking shoes)
With this balance, you’ll stay comfortable whether you’re exploring a festival, walking the beach, or hiking up in the hills.
Local Events and Cultural Festivals
Late October usually brings community events and cultural celebrations that highlight Hawaii’s heritage. The Kona Coffee Cultural Festival is a big one, mostly in early November, but some activities start in late October. You can check out tastings, farm tours, and live music celebrating Hawaii’s coffee-growing roots.
Honolulu puts on seasonal festivities tied to the Aloha Festivals, which keep going into the fall. These events feature hula, music, and Hawaiian history.
If you’re visiting around Halloween, you’ll find themed activities on Oahu, Maui, and the Big Island. Waikiki, for instance, hosts family-friendly parades and evening gatherings.
You might also find smaller community events that focus on storytelling, crafts, and local food—lots of ways to connect with Hawaiian history and traditions.
These festivals give you a chance to experience more than just beaches and really get a feel for the islands’ cultural roots.
Visitor Crowds and Tourism Trends
By late October, Hawaii enters a shoulder season for tourism. You’ll spot fewer visitors than you would during the summer or winter holidays.
Hotels usually have more open rooms, and prices—especially at mid-range spots—tend to drop. That’s always nice if you don’t want to splurge.
Flights get a bit cheaper too compared to those packed peak months. Most round-trip fares from the U.S. mainland hover between $400 and $600, though it really depends on where you’re flying from and which island you pick.
At places like Pearl Harbor, Haleakalā, or Waipiʻo Valley, you’ll wait in shorter lines. Booking a guided tour suddenly feels a lot less stressful.
Beaches like Waikiki or Poipu aren’t as packed, so you actually get some space to stretch out and unwind.
The slower pace lets you wander through festivals or try local restaurants without fighting crowds. If you’re after a mix of culture, good weather, and a little breathing room, late October feels like a smart bet.