In May, the roadside stands near Hanalei sell sweet apple bananas and fresh coconuts while the taro fields glow a wet, electric green under clearing morning clouds. Lei Day arrives on the first of the month, and the island fills with flower garlands and ukulele. It is a soft, easy month on the Garden Isle, with warm water, long light and the winter crowds mostly gone.
What is the weather like in Kauai in May?
May is warm, breezy and mostly sunny, with a few quick showers rather than long gray spells. May sits between its neighbors on the calendar with quieter crowds and softer room rates.
| Month | Average high (°F) | Average low (°F) | Rain days | Sea (°F) |
|---|---|---|---|---|
| April | 79.8 | 69.5 | 5.4 | 76.3 |
| May | 81.6 | 70.9 | 4.4 | 77.9 |
| June | 83.3 | 73.4 | 5.0 | 78.8 |
Mornings are the softest part of the day, with light that turns the cliffs gold and a cool trade wind coming off the water. By midday it feels properly tropical on the coast, and a hat and shade are welcome. Evenings stay warm enough for dinner outside in a T-shirt, perhaps with a light layer once the breeze picks up.
Rain in May arrives as brief passing showers, often with a rainbow right behind. It falls most on the windward north and east sides and on the mountain slopes. Princeville and Hanalei get far more than the dry, sunny south and west around Poipu and Waimea, and the canyon rim at Kokee is much cooler and can turn misty in an afternoon.
Days are long, with about thirteen hours of daylight in the middle of the month. That leaves room for an early hike, a beach afternoon and a late sunset dinner without rushing. Pack for sun first and rain second.
Can you swim in Kauai in May?
Sure, you can enjoy a long, comfortable swim because the ocean stays in the upper 70s. That is mild enough to snorkel for an hour without a wetsuit, though some people like a rash guard for the sun.
By May the big winter swells have usually eased, and the north shore beaches around Hanalei and Anini often become gentler than in winter. The south shore at Poipu tends to be friendly for families and first-time snorkelers, while the west side along Polihale has strong shorebreak and currents at many times of year. Conditions change from day to day and beach to beach, so never assume a beach is calm.
Before swimming, especially at beaches on the north and west sides where waves and currents can catch you off guard, check the signs, obey the flags and talk to the lifeguard. Keep a respectful distance from sea turtles and monk seals, which are protected, and stay off the reef. Bring a mask, a rash guard and mineral sunscreen.
What to do in Kauai in May
May begins with Lei Day on the first of the month, when schools, hotels and parks across the islands show off flower, leaf and shell garlands, and you will see hula and music at community events. Kauai is a good place to catch it, with a pace quiet enough that the celebration feels local rather than staged. Beyond that, May is a month for the outdoors: hiking, kayaking, snorkeling and long drives with the windows down.
Food follows the same easy rhythm. Look for fresh poke at small markets, plate lunches at roadside counters, shave ice after the beach and farm stands selling tropical fruit. Farmers markets around the island are a good way to taste what is in season without planning much.
The Na Pali Coast by sea or trail
The fluted green cliffs of the Na Pali Coast are the island’s signature view, and May is a good month to see them. Boat trips leave from the west side and from the north in calmer conditions, and you may spot dolphins, turtles and sea caves along the way. Helicopter flights cover the same coast from above for those who prefer the aerial view.
Hikers can walk the first stretch of the Kalalau Trail from Haena, a muddy and rewarding path with views back along the shore. Haena State Park has a reservation system, so plan that before you go. Wear shoes with grip, since showers keep the trail slick, and start early before the clouds build.
Waimea Canyon and Kokee
Nicknamed the Grand Canyon of the Pacific, Waimea Canyon reveals waterfalls that shine following rain, plus green ridges and red cliffs. Drive up from the west side and stop at the lookouts, then continue to Kokee, where the air is cool and the forest trails are quiet. Mornings give the clearest views, before cloud rolls into the canyon.
Pack a jacket, since the beach is much warmer than the rim. Pair the canyon with a stop in Waimea town for lunch, then head to a south or west beach for an afternoon swim and a sunset.
Hanalei, Poipu and the beaches
Hanalei Bay is a wide crescent backed by mountains, with a pier, a shaded park and a relaxed town of surf shops and cafés. In May the water often invites paddleboards and gentle swims, but check conditions with the lifeguard first. Lush taro fields and the one-lane bridges on the way in make the drive part of the day.
Poipu on the sunny south shore has sheltered coves, snorkeling and the chance of seeing a monk seal resting on the sand. Give any seal or turtle a wide berth. Both coasts make good halves of a beach day, one for green scenery and one for dry, sunny sand.
On a showery day, browse the shops of Kapaa and Lihue, visit a botanical garden or a coffee farm, or settle into a long lunch. Showers usually pass fast, so it rarely pays to cancel a whole day.
A two-day itinerary for Kauai in May
Day 1 starts on the north shore. Get to Hanalei at an early hour, while the beach sits quiet and the light stays soft, then swim or paddle when the lifeguard reports that conditions permit. Have breakfast at a café in town, then walk the pier and browse the shops. If you have a reservation for Haena State Park, spend late morning at the beach and the first stretch of the Kalalau Trail.
Take a plate lunch from a roadside truck, then drive back slowly, stopping at lookouts and fruit stands. Late afternoon suits the Kilauea area or a swim at a quieter bay. Sunset comes late in May, so dinner can be unhurried, with fresh fish in Kapaa or Princeville. If the rain settles in, shift to galleries, a coffee farm tasting or a garden.
Day 2 heads west and south. Drive up to Waimea Canyon and Kokee in the morning for the clearest views, with a jacket in the bag. Grab lunch in either Waimea or Hanapepe, where galleries and aged wooden storefronts fill a little town, and give yourself room to stroll.
In the afternoon, go to Poipu for snorkeling, a long swim or a beach nap. Watch the sunset from the shore and have dinner nearby. If it turns gray, spend the afternoon in a museum, a spa or a leisurely meal in town.
Is Kauai busy in May?
No, May is one of the calmer months on the island, sitting between the spring break rush and the summer family season. Beaches, trails and restaurants are easier than in winter or midsummer, though weekends and Memorial Day week bring more visitors.
Rooms and rental cars are easier to find than in the holiday weeks, but the best places still go early on popular stretches. Book early for Memorial Day weekend and the last days of the month, and later for quiet midweek stays. Restaurant tables in Hanalei and Poipu fill up on weekends, so a reservation for dinner is a good habit.
The reservations that matter in May are the usual ones for popular parks and trails, notably Haena State Park on the north shore. When conditions are at their finest, seats on Na Pali Coast boat tours tend to disappear as well. Make those plans first, then fill in the rest around them.
What to pack for Kauai in May
Pack for sun, brief rain and a cool canyon, and keep it light.
- For quick showers on the north and east sides, pack a lightweight rain jacket.
- Footwear that holds traction, for slick rocks and trails turned to mud.
- A warm layer, since Kokee and Waimea Canyon are much cooler.
- For the intense sun at noon, bring a hat along with mineral sunscreen.
- Mask, snorkel and a rash guard, for the warm water.
- A dry bag, to protect phones and cameras on boats and beaches.
Good to know before you go
May falls just before the Central Pacific hurricane season, which runs from June 1 to November 30, so the month sits outside the official season. Getting around the north, west and south is simplest with a rental car, and fill the tank before any long drive. Book the popular reservation-only places first, then leave room for slow afternoons. Lodging taxes add to the room rate:
| Fee | Amount | Who pays |
|---|---|---|
| State Transient Accommodations Tax | 11.00% | Guests, on lodging |
| Kauai County Transient Accommodations Tax | 3% | Guests, on lodging |
| General Excise Tax pass-on, Kauai County (maximum) | 4.7120% | Customers, on business sales |
Kauai in May vs April and June
Moving the trip to April means a slightly cooler sea and a few more showers, and a bit more of the spring break crowd early in the month. Leftover winter swells can still make the north shore rougher, so beach plans lean toward the south side. It suits those who like cooler hiking days and do not mind a little more rain.
June is warmer, with a warmer sea, and the island starts to fill with summer family trips. Kamehameha Day on June 11 brings parades and flower leis, a cultural treat. The hurricane season also begins on June 1, which is worth knowing when you plan ahead.
Choose May if you want the balance: warm water, long days, fewer people and easier bookings. Shift earlier for lower-key hiking, and later for the warmest swimming and school-vacation travel with children.
Is May a good time to visit Kauai?
Yes, especially for travelers who want warm water, green mountains and uncrowded trails. Hikers, snorkelers, couples and families with flexible schedules will all find May easy to enjoy. Those who want a guaranteed dry hike on the north side, or the biggest surf, may prefer a different season.
On arrival, sort out the reservations first, whether it is Haena State Park or a Na Pali boat trip, then build the rest of the days around them. Keep mornings for hikes and viewpoints, and afternoons for the beach. What makes May special on Kauai is its mood: Lei Day flowers at the start, rainbows after quick showers, and a sea warm enough to float in until the sun goes down behind the cliffs.
Sources
- NOAA NCEI, monthly normals 1991-2020, station USW00022536, checked September 8, 2026
- Open-Meteo Marine API, average 2015-2024, checked September 8, 2026
- sunrise-sunset.org, sunrise and sunset calculated for the 15th of the month, checked September 8, 2026
- Hawaii Department of Taxation, Tax Announcement No. 2025-03 (Transient Accommodations Tax Law Changes from 2025 Legislative Session), files.hawaii.gov/tax/news/announce/ann25-03.pdf, checked September 24, 2026
- County of Kauai, Department of Finance, Transient Accommodations Tax page, kauai.gov/Government/Departments-Agencies/Finance/Transient-Accommodations-Tax, checked September 25, 2026
- Hawaii Department of Taxation, County Surcharge on General Excise and Use Tax page, tax.hawaii.gov/geninfo/countysurcharge/, checked September 25, 2026
- NOAA NCEI, monthly normals 1991-2020, station USC00518165
- NOAA NCEI, monthly normals 1991-2020, station USC00513099
- NWS Honolulu / Central Pacific Hurricane Center, « 2026 Central Pacific Hurricane Season Outlook », weather.gov/hfo/hurricaneOutlook2026, checked September 24, 2026
To plan your stay
- Things to Do in Kauai: Na Pali Views, Waimea Canyon, North Shore Beaches and Local Food
- Where to Stay in Kauai: Poipu, Princeville, the Coconut Coast and the West Side
- Kauai vs Oahu: Beaches, Things to Do, Weather and Getting Around
- Day Trips from Kauai: Waimea Canyon, Haena and the Na Pali Coast, Wailua and Polihale