Stay in Kauai in May
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May on Kauai marks the transition from the wetter winter months into the drier summer pattern. Highs average 28.3°C (83°F) and lows settle around 22.1°C (72°F), warm enough for full beach days when the sun cooperates. Rainfall tapers from the heavier winter totals, though the island still sees about 102mm across roughly 17 days with at least some measurable precipitation. Most of those days bring brief tropical showers rather than all-day downpours, and the south shore around Poipu might see half the rainfall that falls on the north shore near Princeville. The trade winds keep the humidity from feeling oppressive at the coast, though step inland to a sheltered valley and you notice the moisture fast.
The island is still visibly lush from the winter rains. Every ridgeline glows an almost absurd shade of green, and waterfalls that narrow to a trickle by September currently run wide enough to hear from the road. May sits in a lull between the winter high season (December through March) and the summer family wave that builds from June. Crowds drop, particularly along the north shore in Hanalei and Princeville. Lei Day at the top of the month anchors a statewide Hawaiian celebration of lei-making, and the Memorial Day long weekend at month's end brings a brief uptick in mainland arrivals. The roughly 3 weeks between those two anchors tend to be among the quietest stretches on Kauai's calendar. The National Tropical Botanical Garden, established in 1964 on the south shore, reaches its most lush state with months of accumulated rain still feeding its streams.
If you want the driest, most predictable sunshine, the September-October window ranks higher. But May gives you Kauai at its greenest, with warm days, manageable rain, and a fraction of the peak-season crowds. Fewer cars crowd Kuhio Highway. Restaurants in Kapaa seat you without a wait. The island feels less like a resort destination and more like the place its 73,000 residents call home.
Why visit in May
- Waterfalls island-wide still run strong from accumulated winter rain, producing some of the most dramatic cascades of the year from the east-side valleys to the coastal cliffs.
- Shoulder-season accommodation availability improves compared to the December-March rush, with broader selection across both Poipu and Princeville than you would find in winter or summer.
- Trail solitude increases on popular routes. The Kuilau Ridge Trail on the east side, normally a steady procession of hikers, might see a handful of people on a May weekday.
- Tropical flowering plants hit peak bloom. Plumeria, heliconia, and ohia lehua respond to months of sustained moisture with heavy flowering that transforms garden visits and trailside scenery.
Worth knowing
- Brief rain showers hit on about half the days, with the north and east coasts catching the heavier share. Plans built around guaranteed all-day sunshine need a south-shore backup.
- Popular hiking trails can turn muddy after sustained showers. The Kalalau Trail's stream crossings occasionally become impassable for a day or two following heavy downpours.
- Snorkeling visibility drops when runoff carries sediment into nearshore waters, particularly along the north and east coasts after a stretch of rain.
- The persistent warmth and humidity affect gear. Cameras fog when you move between air-conditioned cars and the warm air outside, and leather goods left in a damp room can develop mildew overnight.
Best for
Think twice if
May delivers warm, tropical days with intermittent showers across Kauai. The south shore around Poipu sits in a partial rain shadow and typically receives roughly half the precipitation of the north shore near Hanalei, making it the more reliable bet for afternoon clearing. Morning showers are common island-wide, but they tend to be brief and followed by sunshine, especially as the month progresses toward the drier summer pattern. Trade winds keep the humidity manageable at the coast, though sheltered valleys feel noticeably stickier. Temperatures at highland elevations around Kokee and the canyon rim drop to about 16-18°C (61-64°F), enough that a light layer feels welcome by late afternoon.
Seasonal caution
- Flash flooding can develop in valleys and stream beds after heavy downpours, even when skies are clear at the coast. Stream crossings on hiking trails can rise within minutes of sustained rain upstream. Check conditions with state park rangers before committing to multi-hour routes.
- North-shore ocean swells remain elevated through early May from residual winter patterns. Rip currents are powerful at several north-shore beaches, and swimming at unguarded locations carries serious risk even when the surface looks calm.
Year-round climate
Averages from the last 5 years.
| Month | Avg high (°C) | Avg low (°C) | Rainfall (mm) |
|---|---|---|---|
| Jan | 15 | 8 | 210 |
| Feb | 15 | 8 | 218 |
| Mar | 15 | 9 | 298 |
| Apr | 15 | 9 | 386 |
| May | 16 | 10 | 293 |
| Jun | 17 | 11 | 221 |
| Jul | 17 | 12 | 268 |
| Aug | 18 | 12 | 181 |
| Sep | 18 | 12 | 195 |
| Oct | 17 | 11 | 218 |
| Nov | 16 | 10 | 229 |
| Dec | 15 | 9 | 290 |
Holidays and festivals in May
Public holidays
- Truman Day(Truman Day)8 May 2027
- Memorial Day(Memorial Day)31 May 2027
Best things to do in May
Waterfall chasing along the east side
sightseeingWailua Falls drops roughly 25 meters (80 feet) into a pool framed by tropical foliage, visible from a roadside overlook off Maalo Road without any hiking required. The falls split into twin streams during high water, doubling the visual impact.
Winter and early-spring rains have saturated the island, and May's waterfalls still run at strong volume before the drier summer months narrow them. By late August these same falls shrink to a fraction of their May width.Booking tipNo reservation needed. Arrive before 09:00 to beat the tour-bus traffic.
Na Pali Coast boat tour
tourA catamaran or zodiac tour from Port Allen reveals 16 miles of fluted sea cliffs, sea caves, and hanging valleys inaccessible by road. On clear mornings, the cliffs catch early light in shades of rust and green, with monk seals sometimes visible on the rocky ledges below.
Residual moisture from the wetter months feeds dozens of temporary waterfalls that cascade off the tall sea cliffs, creating a spectacle that largely vanishes by August when the flows dry up.Booking tipMorning departures offer calmer seas. Book 5 to 7 days ahead in May since operators run fewer trips than peak season.
Allerton Garden guided tour
culturalThis landscaped botanical garden in Lawai Valley was established in 1986 and covers about 32 hectares (80 acres) of themed garden rooms, streams, and specimen plantings. Guided walking tours take roughly 2.5 hours through tropical collections from across the Pacific.
Months of winter rain and warming spring days push tropical flowering plants into overdrive. Heliconia, ginger, and plumeria are at peak bloom, and the garden's stream-fed water features run at full flow.Booking tipTours sell out even in shoulder season since group sizes are capped. Reserve online at least 3 days ahead.
South-shore snorkeling at Poipu Beach Park
water sportsPoipu Beach Park on the south shore offers Kauai's most protected snorkeling conditions. A natural rock barrier creates a sheltered pool suitable for beginners, while the outer reef attracts Hawaiian green sea turtles and tropical reef fish.
The transition from winter to summer swell patterns means calmer south-shore surf conditions than the months that follow. The drier south coast also sees less runoff than the north side, keeping reef visibility cleaner.Booking tipNo booking needed. Arrive before 10:00 for parking, which fills by midday even in shoulder season.
Kapaa coastal path cycling
outdoorThe paved Ke Ala Hele Makalae path stretches about 6 km (3.7 miles) along the east coast from Kapaa to Kealia Beach. The flat route follows a former cane-haul road past rocky shoreline, ironwood groves, and open-ocean views over a gentle 45-minute ride.
Morning rides between rain showers give you the path nearly to yourself, and the trade winds keep the warm air from feeling heavy. Summer and winter both draw bigger crowds to this stretch.Booking tipBike rental shops in Kapaa town sit a short walk from the path's southern trailhead. No advance booking needed in May.
Hanalei Bay stand-up paddling
water sportsHanalei Bay forms a wide, sheltered crescent on the north shore with the Hanalei Pier and the Bali Hai ridgeline (Mount Makana) as a backdrop. The calm inner bay is well suited for stand-up paddling even for beginners.
North-shore swells subside through May as winter patterns fade. By mid-month the bay typically flattens enough for safe flat-water paddling, though early May can still carry residual swell.Booking tipBoard rentals are available from shops in Hanalei town. Morning sessions offer the calmest water.
Kokee State Park birding
natureThe native ohia lehua forests around Kokee, perched at roughly 1,200 meters (3,900 feet) above Waimea Canyon, shelter several endemic Hawaiian bird species including the apapane, amakihi, and elepaio. The Pihea Trail and Alakai Swamp Trail wind through moss-draped cloud forest unlike anything else in Hawaii.
Spring is nesting season for several endemic species, increasing their vocal activity and visibility. The native ohia lehua trees bloom red in spring, drawing nectar-feeding apapane in concentrated numbers.Booking tipNo permits needed for day hikes. The road up to Kokee can be muddy after rain, so check conditions before driving up.
What to eat in May
In season: fruit
Lychee
Kauai's lychee trees start producing in mid-to-late May. The small, rough-skinned fruits from backyard trees in Kilauea and along the north shore tend to be sweeter and more fragrant than anything shipped to mainland grocery stores. Look for them at north-shore farm stands while the late-May harvest lasts.
Mango (early season)
The first mangoes of the year appear on trees across the south and west sides of the island in May. These early-season Hayden and Rapoza varieties are smaller and more tart than the peak-summer harvest, but locals prize them for green-mango salads and chutney.
Lilikoi (passion fruit)
May's lilikoi crop tends to be particularly aromatic on Kauai. The tart, intensely fragrant pulp appears in shave ice syrups, haupia (coconut pudding), cheesecakes, and butter at bakeries across Lihue and Koloa.
On menus now
Poke (spring ahi)
Spring yellowfin tuna catches keep the poke counters at fish markets across the island well stocked in May. The traditional shoyu-sesame and limu (seaweed) preparations use the freshest cuts and benefit from strong local fishing runs.
In markets
Breadfruit (ulu)
Breadfruit season begins in late spring on Kauai. Roasted over coals or fried in slices, it serves as a starchy side at plate-lunch counters across the west side. Farm stands in Waimea and Hanapepe carry it when the trees are producing.
Regular events in May
Lei DayFree
Hawaii's statewide celebration of lei-making traditions. Kauai marks the day with community lei-making workshops, hula performances, and lei competitions at parks and community centers across the island.
May 1Visitor Industry Charity Walk (Kauai)
The Kauai chapter of the statewide hospitality industry fundraising walk. Participants walk a scenic coastal route to raise money for local nonprofits, with the island's hospitality community turning out in force.
Mid-May (date varies annually)Memorial Day observancesFree
Federal holiday with memorial services at veterans' sites across the island. The long weekend marks a brief seasonal shift in domestic visitor arrivals and adjusted hours at smaller shops and restaurants.
Last Monday of MayBest places this May
Waimea Canyon State Park
natureSometimes called the Grand Canyon of the Pacific, this 16 km (10-mile) canyon drops roughly 900 meters (3,000 feet) from rim to floor. In May, waterfalls still appear along the canyon walls that are absent in drier months, and the red-green contrast intensifies when the rock face is wet from a passing shower. Multiple overlook pulloffs line the road up from the town of Waimea.
West sideOpaeka'a Falls
natureA broad waterfall on the Wailua River, visible from a roadside overlook off Kuamoo Road without any hiking required. In May the cascade runs wider than its late-summer span, framed by a wall of dense tropical green on the opposite valley wall.
WailuaLimahuli Garden and Preserve
gardenFounded in 1967 near the end of the north-shore road, this botanical preserve showcases native Hawaiian plants in a valley backed by a dramatic fluted mountain ridge. The terraced taro fields (lo'i kalo) are lush in spring, and guided tours explain traditional Hawaiian land management practices that predate Western contact.
HaenaHanapepe town
neighborhoodThis small west-side settlement calls itself Kauai's Biggest Little Town. The main street is lined with art galleries and hosts a Friday Art Night walk most of the year. The historic swinging bridge nearby gives a view down the Hanapepe River valley toward the red-dirt bluffs.
HanapepeHa'ena State Park
natureThe gateway to the Kalalau Trail and the dramatic far end of Kauai's north shore. The park requires advance parking reservations year-round, but May's lower demand makes slots easier to secure than summer. The Makua (Tunnels) reef nearby offers protected snorkeling when seas are calm.
HaenaKoloa Heritage Trail
historicalA walking route through old Koloa town on the south shore, passing 14 interpretive markers related to Kauai's sugar plantation era. The route covers about 16 km (10 miles) of roads and paths through a quiet historic district where you can still trace the footprint of Hawaii's first commercial sugar mill from the 1830s.
Koloa
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Insider tips
Hanapepe's Friday Art Night usually packs the sidewalk in peak months, but in May you can spend time with gallery owners who are happy to talk story about their work and the town's history. The pace feels entirely different.
Waimea Canyon's rim lookouts cloud over by midday on most May mornings. Get to the first overlook by 08:00 for clear views down the canyon. If you arrive after 10:00, you will likely see nothing but fog.
The Wednesday afternoon farmers market in Kapaa is where residents shop, not the weekend tourist-oriented markets near the resorts. In May the stalls carry early-season lychee and starfruit before they appear at chain grocery stores.
If Ha'ena State Park's online parking reservation shows full for your target day (it happens even in May on weekend mornings), try refreshing the booking site around midnight when same-day cancellations sometimes release slots.
The 35-minute drive between Princeville and Poipu often means the difference between rain and sunshine on any given afternoon. When your morning starts under clouds on the north shore, drive south before writing off the day.
Avoid these mistakes
- Booking all your nights on the north shore because it photographs well. The north side catches the heavier share of whatever rain May delivers, and a full week in Princeville can mean several overcast days with limited sunny breaks. Split your stay or base yourself on the south side.
- Attempting the Kalalau Trail without rain gear or traction-soled footwear. The trail can turn muddy after showers, with stream crossings that rise unpredictably. What takes an hour in dry conditions takes two on a wet day, and a slip on wet rock can end a trip early.
- Assuming all Hawaiian beaches are safe for swimming. Hanakapiai Beach, the first significant stop on the Kalalau Trail, looks inviting but has currents that have caused multiple drownings over the years. Several north-shore beaches carry similar hazards when late-season swells run.
- Skipping the Na Pali boat tour because of rain in the forecast. Operators cancel only in high-surf conditions, not drizzle. Some of the most dramatic photographs of that coastline come from overcast, misty mornings when the temporary waterfalls are flowing.
Practical tips for May
Rental cars are the only realistic way to navigate Kauai since public transit covers limited routes on an irregular schedule. The north-shore road past Princeville narrows in several places and occasionally floods after heavy showers, so check conditions before driving toward the road's end near Haena. If the Kalalau Trail is on your list, secure permits through the Hawaii state parks reservation system at least 2 weeks ahead. Only 60 day-hikers per day are allowed beyond the 3.2 km mark. Most restaurants drop their reservation-only policies in shoulder season, with the end-of-month holiday weekend as the one exception when south-shore spots fill up. Cell service remains spotty outside Lihue and the resort corridors. Worth noting, downloading offline maps before heading to the west side or the canyon prevents the frustration of losing signal mid-route.
FAQ
Is May a good time to visit Kauai?
May is a good shoulder-season month if you want warm weather, green scenery, and fewer crowds without paying peak-season rates. The island is still lush from the winter rains, waterfalls run strong, and the transition toward drier summer weather means showers tend to be brief rather than all-day. If your trip revolves around waterfall hikes, botanical gardens, and boat tours, May delivers well. If you want the absolute driest conditions, the September-October window ranks higher.
What is the weather like in Kauai in May?
Expect warm, humid days with highs around 28°C (83°F) and lows near 22°C (72°F). Brief tropical showers hit on roughly half the days, typically arriving in the morning and followed by clearing. The island's rainfall varies dramatically by coast. The south shore around Poipu stays notably drier than the north shore near Princeville, so positioning yourself on the south side can make a material difference in how many sunny hours you get. Trade winds keep the warmth comfortable at the coast, but sheltered valleys feel sticky.
Is Kauai crowded in May?
May ranks among the quietest months on the island. Winter visitors have gone home and summer family travel has not started yet. You will share the major lookout points and popular beaches with other visitors, but trail density and restaurant wait times improve noticeably compared to the December-March peak. The holiday weekend at month's end draws a brief increase in visitors, but it fades by mid-week.
Can you swim and snorkel in Kauai in May?
Swimming is fine at protected south-shore beaches where surf rarely becomes dangerous. Mind you, snorkeling visibility depends heavily on which coast you choose, since runoff from showers clouds the water on the north and east sides. The north shore may carry residual winter swell in early May, making several beaches more suited for watching from the sand than swimming. Always check current conditions with lifeguards.
Is Kauai safe for solo travelers?
Kauai scores 8.5 out of 10 for solo-traveler safety (see the TTDI Solo-Safety Index). The island is small, communities are close-knit, and violent crime targeting visitors is uncommon. Standard precautions apply. Do not leave valuables visible in rental cars at trailheads, avoid swimming alone at unguarded beaches, and let someone know your hiking itinerary before heading into remote trail sections.
Things to Do in Kauai in May
Free cancellation Koloa Zipline in Kauai
Outdoor experience: 3 hours, free cancellation.
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Free cancellation Kauai Airplane Tour: Na Pali Coast, Waterfalls & Window Seats
Outdoor experience: 1.1 hours, free cancellation.
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Free cancellation Kauai Eco Adventure Helicopter Tour
Outdoor experience: 50 minutes, free cancellation.
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Free cancellation Kauai: NaPali Boat Tour on the Amelia K
Day trip: 5 hours, free cancellation.
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Free cancellation Kauai Private Doors Off Helicopter Tour: Ultimate Waterfalls
Outdoor experience: 1.2 hours, free cancellation.
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Free cancellation Kauai: Na Pali Coast Super Raft Snorkel Adventure
Cruise: 4.5 hours, free cancellation.
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