Hawaii Weather in May
May is when Hawaii flips from wet season to dry season. The tradewinds return, rain tapers off dramatically, and the islands settle into the warm, stable weather pattern that lasts through September. Average highs sit at 84-86°F across all islands, lows around 72-74°F. Ocean temps hit 77-79°F. That's bath water.
Rainfall drops to 1-2 inches on leeward (west) coasts and 3-5 inches on windward (east) sides. Translation: the resort sides of every island are dry and sunny almost every day. The jungle sides get brief afternoon showers that keep everything impossibly green. Both are beautiful. Neither ruins your day.
- •UV index in Hawaii runs 11-12+ in May. That's extreme. Reapply sunscreen every 90 minutes or learn the hard way.
- •Tradewinds blow consistently from the northeast at 10-20 mph. Windward coasts are breezy and slightly cooler. Leeward coasts are calmer and hotter.
What to Pack
Light and simple. Swimsuits, shorts, breathable shirts, one light rain shell for windward hikes and sudden tropical showers. Reef-safe sunscreen is required by Hawaii law — SPF 50+ mineral sunscreen without oxybenzone or octinoxate. Good water shoes for rocky beaches and tide pools. A light fleece if you're heading to Mauna Kea summit (38°F up there).
Maui Without the Chaos
May is Maui's shoulder season sweet spot. Winter whale-watching crowds cleared out in April. Summer family vacations don't ramp up until mid-June. What's left is Maui at its most relaxed — which is saying something for an island that handles 3 million visitors a year.
- •Wai'anapanapa black sand beach requires advance reservations in 2026. Slots open 30 days ahead. Don't show up without one.
- •Maui hotel rates in May average 20-25% below December-January peak. Ka'anapali resorts that charge $600/night in winter drop to $400-480.
| Category | Price Range |
|---|---|
| Haleakala sunrise reservation | $1 + $30 park entry |
| Wai'anapanapa State Park | $5 entry + $10 parking |
| Molokini snorkel tour | $80-150 |
| Road to Hana guided tour | $150-250 |
Road to Hana
The 64-mile drive along Highway 360 with 620 curves and 59 bridges is less packed in May than any summer month. Start by 7am from Paia to beat what crowds remain. Stop at Twin Falls (easy, free), Wai'anapanapa State Park for the black sand beach (reservation required, $5 entry + $10 parking), and the Pipiwai Trail to 400-foot Waimoku Falls (4 miles round trip through a bamboo forest).
Pro move: drive past Hana to the backside of Haleakala. The road gets rough and rental car companies technically forbid it, but the views of Kaupo Gap and the southern coastline are the emptiest scenery on Maui.
Haleakala Sunrise
Sunrise reservations at the 10,023-foot summit of Haleakala are required ($1 per reservation + $30 park entry per vehicle). In May, sunrise is around 5:50am, so you're driving up at 3:30am. It's 38-45°F at the summit — bring real layers, not a beach hoodie.
The crater floor glows orange, pink, and purple as the sun breaks over the cloud layer below you. It's one of the most photographed moments in Hawaii and it actually delivers. Book reservations 60 days ahead at recreation.gov.
Snorkeling at Molokini
The crescent-shaped volcanic crater 2.5 miles off Maui's south coast has 150+ feet of visibility in May. Calm waters, minimal current, and green sea turtles everywhere. Morning boat tours ($80-150) depart from Ma'alaea Harbor. Book the earliest departure — the crater gets crowded by 10am even in shoulder season.
Big Island: Lava and Stars
The Big Island is two islands duct-taped together. The Kona (west) side is dry, sunny resort country. The Hilo (east) side is a rainforest. May weather makes both sides excellent — Kona gets zero rain, Hilo's showers are short and warm. And then there's the volcano.
- •Do not bring children under 13 or pregnant travelers to Mauna Kea summit. The altitude is no joke — headaches and nausea are common even for fit adults.
- •Kilauea eruption status changes rapidly. Bookmark the USGS HVO page (usgs.gov/hvo) and check the morning of your visit.
| Category | Price Range |
|---|---|
| Volcanoes National Park entry | $30/vehicle (7-day pass) |
| Manta ray snorkel tour | $80-130 |
| Mauna Kea summit tour | $200-280 |
| Kilauea lava boat tour | $150-250 (when active) |
Hawaii Volcanoes National Park
Kilauea is one of the most active volcanoes on Earth. Whether you see glowing lava depends on current eruption status — check the USGS Hawaiian Volcano Observatory site before your visit. Even without active surface flows, the park delivers: Crater Rim Drive, the Thurston Lava Tube (a walk through a 500-year-old tunnel), and the Devastation Trail through a landscape that looks like another planet.
The Chain of Craters Road descends 3,700 feet over 19 miles from the summit to the coast, ending where a 2003 lava flow buried the road. The drive takes 2 hours with stops. Entry is $30 per vehicle, valid for 7 days.
Mauna Kea Stargazing
At 13,796 feet, Mauna Kea's summit sits above 40% of Earth's atmosphere and most of its water vapor. The result: some of the clearest skies on the planet. The Visitor Information Station at 9,200 feet runs free public stargazing programs nightly from 6-10pm with telescopes set up on the plateau.
Driving to the true summit requires a 4WD vehicle. The last 6 miles of road is unpaved and steep. Sunset from the summit is surreal — you're above the clouds watching the shadow of the mountain stretch across the Pacific. No charge, but altitude sickness is real. Spend at least 30 minutes at the Visitor Station to acclimatize before heading up.
Manta Ray Night Dive
Off the Kona coast, manta rays with 12-foot wingspans feed on plankton attracted by underwater lights. You float on the surface with a snorkel while mantas glide inches below you. It's genuinely otherworldly. Night snorkel tours run $80-130 and operate year-round, but May's calm seas mean fewer cancellations.
Oahu Beyond Waikiki
Yes, Waikiki is on Oahu. No, it's not the whole island. Oahu has world-class hiking, the North Shore's legendary surf breaks, Pearl Harbor, and food that embarrasses most mainland cities. May thins out the tourist herds enough to actually enjoy it.
- •Pearl Harbor tickets go live at 7am HST, 60 days ahead. Set an alarm. They sell out within hours.
- •Skip the Waikiki hotel markup. Stay in Kailua on the windward side for half the price and twice the beach quality.
| Category | Price Range |
|---|---|
| Diamond Head reservation | $5/person + $10 parking |
| Pearl Harbor combo package | $89 |
| USS Arizona Memorial | Free (reservation required) |
| North Shore food trucks | $12-16 |
Diamond Head and Beyond
The Diamond Head summit trail (1.6 miles round trip, 560ft gain) is Oahu's most popular hike. In May, the 6am opening is your best bet before heat and crowds. Reservation required ($5 per person), parking $10. The 360-degree views from the WWII-era bunker at the top are worth the sweat.
For a less crowded alternative, Koko Head Railway Trail is 1,048 railroad ties straight up the side of a crater. It's brutal, short (1.8 miles round trip), and the views rival Diamond Head without the tourists. Free, no reservation needed.
North Shore
May means the winter swells are gone and the North Shore transforms from a pro-surfer arena into a calm swimming beach. Sunset Beach, Pipeline, and Waimea Bay have flat, crystal-clear water perfect for snorkeling. The surf shacks in Haleiwa serve shave ice (Matsumoto's has a line; Aoki's next door is just as good with no wait) and garlic shrimp from the food trucks on Kamehameha Highway.
Shark's Cove on the North Shore is the best free snorkeling on Oahu in summer conditions. Tide pools teeming with tropical fish, no boat needed.
Pearl Harbor
The USS Arizona Memorial is free but requires timed-entry tickets. Reserve at recreation.gov — they release tickets 60 days in advance and sell out fast. The full Pearl Harbor experience (Arizona Memorial + Battleship Missouri + Pacific Aviation Museum) takes 4-5 hours and costs $89 for the combo package.
Kauai: The Hiking Island
Kauai is the oldest main island and the greenest. They call it the Garden Isle because everything grows here — including your appreciation for what Hawaii looked like before resort development. May's dry season start means trails are drier and views are clearer than winter months.
- •Ha'ena State Park (trailhead for Kalalau Trail) requires parking and entry reservations. Book at gohaena.com exactly 30 days ahead — slots sell out in minutes.
- •Kauai has no buildings taller than a coconut palm. It's a county law. The whole island feels different because of it.
| Category | Price Range |
|---|---|
| Ha'ena State Park / Kalalau Trail | $5/person |
| Na Pali boat tour | $150-250 |
| Helicopter tour | $250-350 |
| Waimea Canyon / Koke'e | Free |
Na Pali Coast
The 11-mile Kalalau Trail along the Na Pali Coast is one of the most dramatic hikes in the world. Most day hikers do the first 2 miles to Hanakapi'ai Beach (permit required, $5 per person via gohaena.com). The full trail to Kalalau Beach requires a camping permit and serious fitness — 22 miles round trip with 6,000 feet of cumulative elevation change along cliff edges.
If hiking 11 miles along cliffs isn't your thing, boat tours along the Na Pali Coast run $150-250 and give you the views without the blisters. Morning tours have calmer seas. Helicopter tours ($250-350) cover the coast in 45 minutes and access valleys no trail reaches.
Waimea Canyon
The Grand Canyon of the Pacific. It's 14 miles long, a mile wide, and 3,600 feet deep, painted in red, green, and brown layers. The Waimea Canyon Lookout is a drive-up viewpoint. For hikers, the Cliff Trail and Canyon Trail (3.4 miles round trip) drop into the canyon with views of Waipo'o Falls.
Continue past Waimea Canyon to Koke'e State Park for the Pu'u O Kila Lookout — the best view of the Na Pali Coast from land. Free entry. The road ends here.
Poipu Beach
Kauai's best swimming and snorkeling beach sits on the sunny south shore. Protected reef creates a natural pool on the left side — perfect for families and beginners. Hawaiian monk seals regularly haul out on the sand (stay 50 feet away, it's federal law). Free parking fills by 10am on weekends.
What to Eat
Hawaiian food is a collision of Polynesian, Japanese, Chinese, Filipino, Portuguese, and American traditions that somehow works perfectly. May is mango season, ahi tuna is running, and every island has plate lunch spots that will change your understanding of what $12 can buy.
| Category | Price Range |
|---|---|
| Plate lunch | $10-15 |
| Poke (per pound) | $16-22 |
| Shave ice | $5-8 |
| Farm-to-table dinner | $50-120 |
| Food truck meal | $12-18 |
Plate Lunch
Two scoops rice, one scoop mac salad, and a protein. That's the format. The execution varies from gas station to legendary. On Oahu, Rainbow Drive-In near Waikiki has been doing it since 1961. On Maui, Tin Roof in Kahului (from Top Chef's Sheldon Simeon) elevates the form. On the Big Island, Cafe 100 in Hilo invented the loco moco — hamburger patty, rice, fried egg, and brown gravy.
Poke
Raw ahi tuna, cut into cubes, seasoned with soy sauce, sesame oil, green onion, and whatever else the shop feels like adding. In Hawaii, poke isn't a mainland-style bowl chain — it's sold by the pound at grocery store fish counters and beachside stands. Foodland and Tamura's on every island have solid poke counters. $16-22 per pound.
Shave Ice
Not a snow cone. Shave ice is finely shaved (not crushed) ice with syrup, served over ice cream and azuki beans if you're doing it right. Matsumoto's on the North Shore is the tourist pick. Uncle Clay's House of Pure Aloha in Aina Haina (Oahu) is the local pick. $5-8.
Farm-to-Table
Hawaii's farm-to-table scene is genuinely impressive. Merriman's on the Big Island pioneered Hawaii Regional Cuisine. Mama's Fish House on Maui names the fisherman who caught your dinner on the menu (reservations book 2-3 weeks out). On Kauai, The Dolphin in Hanalei does fresh-catch dinners overlooking the river.
Where to Stay
May is the gap between winter peak (December-March) and summer peak (mid-June-August). Hotels drop 20-30% from winter rates. Vacation rentals on VRBO and Airbnb are even cheaper — many Maui and Kauai condos that charge $400/night in January go for $250-300 in May. Book 3-4 weeks ahead for the best selection.
| Category | Price Range |
|---|---|
| Maui condo (Kihei) | $180-280/night |
| Maui resort (Ka'anapali) | $350-500/night |
| Big Island hotel (Kona) | $200-400/night |
| Oahu (Kailua rental) | $180-300/night |
| Kauai (Poipu condo) | $220-380/night |
Maui ($250-500/night)
Ka'anapali for resort beach access and walkability between hotels. Wailea for upscale and quieter. Kihei for budget condos with beach access — South Kihei Road has dozens of condo complexes from $180-280/night. Paia for surf-town charm near the Road to Hana starting point.
Big Island ($180-400/night)
Kona coast for resorts and sunshine. Hilo side for budget stays near Volcanoes National Park ($120-200/night). Waikoloa Resort Area for mid-range with pools and golf. Volcano Village for charming B&Bs minutes from the park ($130-220/night).
Oahu ($200-450/night)
Waikiki is convenient but overpriced for what you get. Kailua on the windward side has vacation rentals half the price with a better beach. North Shore for laid-back stays near food trucks and snorkeling. Ko Olina for resort vibes without Waikiki's density.
Kauai ($220-480/night)
Poipu on the south shore for the best weather and swimming. Princeville on the north shore for Na Pali views and Hanalei Bay access. Kapa'a on the east side for the most affordable options on the island ($160-260/night).
Budget Breakdown
A realistic 7-day Hawaii trip in May. Per person, assuming mid-range accommodation split between two people and a mix of dining options. Inter-island flights add up if you're island-hopping.
- •Rental cars in Hawaii are expensive. Book 4-6 weeks ahead in May — last-minute bookings can double the price.
- •Skip resort dining for at least half your meals. Plate lunches and food trucks save $30-50 per meal versus hotel restaurants.
| Category | Price Range |
|---|---|
| Flights (mainland US) | $350-650 |
| Hotels/rentals (7 nights) | $1,260-2,800 |
| Rental car (7 days) | $350-550 |
| Food (7 days) | $420-850 |
| Activities + tours | $200-600 |
| Inter-island flight (if applicable) | $80-150 each |
| Total (single island) | $2,580-5,450 |
| Total (two islands) | $2,900-6,000 |
Sample 10-Day Itinerary: Maui + Big Island
Two islands, ten days. This route covers Maui's beaches and Haleakala with the Big Island's volcanoes and stargazing. Inter-island flights between OGG and KOA run $80-120 on Hawaiian Airlines or Southwest.
Day 1: Arrive Maui (OGG)
Pick up rental car at Kahului Airport. Drive to Ka'anapali or Kihei. Settle in, hit the beach, grab a plate lunch from Tin Roof before they close at 2pm. Sunset from the seawall at Lahaina (rebuilt and reopening post-2023 fire — check status).
Day 2: Haleakala Sunrise + Upcountry
3:30am alarm. Drive to Haleakala summit for sunrise. After, explore Upcountry Maui: Kula Botanical Garden, Surfing Goat Dairy, and Grandma's Coffee House. Afternoon nap is mandatory. You earned it.
Day 3: Road to Hana
Leave Paia by 7am. Hit Twin Falls, Garden of Eden, Wai'anapanapa black sand beach. Drive past Hana to the Pipiwai Trail for Waimoku Falls. Return the same way or loop the backside if feeling adventurous.
Day 4: Molokini + Beach Day
Morning snorkel tour to Molokini Crater. Afternoon at Big Beach (Makena) — one of the best beaches in Hawaii. Dinner in Wailea or Kihei.
Day 5: Fly to Big Island (KOA)
Morning flight OGG to KOA (45 minutes). Pick up car, drive to Kona. Afternoon at Kahalu'u Beach Park for easy snorkeling with sea turtles. Evening manta ray night snorkel off Kona coast.
Days 6-7: Hawaii Volcanoes National Park
Drive 2.5 hours from Kona to the park (or stay in Volcano Village). Day 6: Crater Rim Drive, Thurston Lava Tube, Devastation Trail, Kilauea Iki Trail (4 miles across a still-steaming crater floor). Day 7: Chain of Craters Road to the coast, then Punalu'u Black Sand Beach for sea turtles on the way back.
Day 8: Mauna Kea
Daytime: explore Hilo — Rainbow Falls, Hilo Farmers Market (Wednesday or Saturday for the full experience), Akaka Falls State Park. Evening: drive to Mauna Kea Visitor Information Station for sunset and free stargazing program.
Days 9-10: Kohala Coast + Departure
Day 9: Kohala Coast beaches — Hapuna Beach (consistently rated top 10 in the US) and Mauna Kea Beach (stunning but limited parking, arrive by 9am). Snorkel at 'Anaeho'omalu Bay. Day 10: Last swim, airport poke bowl, fly home from KOA.
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