A May morning in Kailua finds the ironwood trees along the beach shaking in the trade winds, while the earliest kayakers paddle toward the Mokulua islands. Surf shops hang out their boards, the farmers’ market stalls fill with fruit and flowers, and the smell of coffee drifts out of the cafés near the town center. May here is warm, bright and easygoing, a good month for long beach days and slow breakfasts on the windward side of Oahu.
What is the weather like in Kailua in May?
May in Kailua is warm and breezy, with sunshine most days and a few quick showers drifting in from the sea. The table puts it next to its neighbors.
| Month | Average high (°F) | Average low (°F) | Rain days | Sea (°F) |
|---|---|---|---|---|
| April | 79.9 | 68.6 | 6.7 | 76.1 |
| May | 81.8 | 70.3 | 6.5 | 76.6 |
| June | 83.0 | 72.1 | 7.1 | 78.1 |
Because Kailua lies on Oahu’s windward coast, clouds and brief rain blow in off the trades right over the town. In May those showers are usually short.
You may get a few minutes of rain while eating breakfast, then watch the sun return and dry the sidewalk before your coffee is cold. Gray days do happen, but a full day of rain is the exception, and the month rarely has more than a day with a real downpour.
Mornings are soft and bright, the best hours for walking the sand or paddling. Afternoons turn warm enough for shorts and a swimsuit, and the wind keeps the heat from feeling heavy. Evenings stay mild, so a light layer is plenty for dinner outside. The days are long, with about thirteen hours of daylight in mid-May, which leaves room for a late swim and a slow sunset.
The sea is a few degrees below the air and pleasant for a long dip once you are in. The air does not get truly hot, so sunscreen and a hat matter more than a fan. Pack a light rain shell or simply wait out the showers under a tree.
Can you swim in Kailua in May?
Yes, the sea is comfortable for a long swim in May, mild rather than bracing, though it can feel cool for the first minute or two when the wind is up.
Kailua Beach is the famous stretch, a wide curve of soft white sand with shallow water that is often gentle near shore. Many families spend whole days here.
The wind that makes it a favorite for kitesurfers and windsurfers also whips up chop on some afternoons, so conditions change with the hour. Lanikai, just south, has a calm reputation and a narrow strip of sand, and swimmers often head there early before the light gets harsh.
Snorkelers will find the water clear on calm mornings, though visibility depends on the day and the wind. Nervous swimmers and young children do best close to the shore and within sight of a lifeguard.
Check the beach signs and flags, and follow the lifeguards, since waves and currents shift from one day to the next. Pack a hat or a rash guard, since the sun stays powerful even with clouds moving over it. Water shoes help where the bottom turns rocky.
What to do in Kailua in May
May opens with Lei Day on May 1, a cherished Hawaii tradition. Schools, community groups and shops celebrate with lei making, hula and music, and you may see people wearing fresh flower garlands around town. It is a gentle, local holiday, and a lei from a flower stand is a nice way to join in.
Beyond that, the month is about the outdoors. The weather suits early starts on the water, long beach lunches and walks in the cool of the morning. The farmers’ market is a pleasant place to taste fruit, baked goods and plate lunches, and the cafés around town serve acai bowls, fresh juices and strong Kona-style coffee. Shave ice is a fine afternoon reward after a swim.
Kailua Beach and the Mokulua islands
Kailua Beach is the heart of the town, and it rewards slow mornings. The sand is soft and wide, the water is turquoise, and the twin Mokulua islands sit offshore like a postcard. The ironwood shade at the park end is good for a picnic, and the wind gives the sky a constant show of kites and sails.
Rental shops in town offer kayaks and paddleboards. Paddlers often go early, while the wind is lighter, and the islands make a natural goal. Landing rules and bird nesting areas apply on the islands, so read the signs and keep to what is allowed. In the afternoon, when the breeze builds, the beach is better for sitting, wading and watching the wind sports.
Lanikai and the neighborhood walks
Lanikai is a quiet residential strip, and a stroll along its streets shows pastel beach houses, hibiscus hedges and glimpses of the sea. The beach is narrow and best at sunrise, when the light turns the Mokulua islands pink. It is a short trip from Kailua town, and parking is limited, so many visitors walk or bike in.
The ridge trail above Lanikai, known as the Pillbox hike, is a favorite for views over both beaches. It is steep and exposed, so early morning is much more comfortable, and good shoes and water help. After the climb, the beach feels like a reward.
Town, markets and local flavor
In Kailua town, you can stroll at an easy pace and find surf shops, bookstores, boutiques and small restaurants. Plate lunches, poke bowls, fish tacos and malasadas show up on many menus. Weekend mornings bring a lively mood, with families, surfers and dog walkers crossing paths.
A short drive takes you to Kaneohe Bay, Waimanalo and the Pali Lookout, where the wind pours over the cliffs and the view spreads across the windward coast. These make an easy half day when you want a break from the sand.
A two-day itinerary for Kailua in May
Day 1 starts early on Kailua Beach, where the morning is calm and bright. Walk the sand, then rent a kayak or paddleboard and aim for the Mokulua islands before the wind rises. By late morning, head into town for an acai bowl or a plate lunch at a casual spot.
In the afternoon, return to the beach for a swim and some shade under the ironwoods. Around dinner, pick a relaxed restaurant in town for fresh fish. With long May days, a sunset stroll along the shore fits easily after the meal. If showers arrive, browse the bookstores and boutiques or linger in a café.
Day 2 begins at Lanikai for sunrise, when the light on the islands is softest. Climb the ridge trail if you want the view, but go early and carry water. Then breakfast at a café in town.
Spend the late morning driving to the Pali Lookout and the Waimanalo coast, with a stop at a fruit stand or a roadside plate lunch spot. Return for a swim or an easy walk, then dinner by the water. On a gray day, the lookout still has its drama, and the shops and cafés of town fill the hours.
Is Kailua busy in May?
Kailua is moderately busy in May, calmer than the winter holidays and summer, though weekends are lively with locals and visitors at the beach.
Spring break has mostly ended, and the summer family rush has not yet begun, so the town feels relaxed. Memorial Day weekend at the end of the month brings extra crowds, with picnics and full parking lots at the beach. Lei Day at the start of the month also brings a festive mood.
Restaurant tables are usually easy outside peak dinner hours, though popular spots fill on weekends. Vacation rentals are the main lodging here, and they book earlier for holiday weekends, so reserve early for Memorial Day and later for the quiet midweek stretches.
Rental cars are easier to find early in the month than around the holiday. Kailua is a residential town, so the crowds feel local rather than resort-like, and early mornings are quiet almost any day.
What to pack for Kailua in May
Pack for sun, wind and quick showers, with a few layers for cooler evenings.
- Swimsuits and a rash guard, for long hours in the water and sun
- A hat and mineral sunscreen, because even under clouds the sun burns strong
- A light rain jacket, for the passing showers
- Water shoes, for rocky stretches and kayak landings
- Sturdy sneakers, for the Lanikai ridge trail
- A light sweater, for breezy evenings
Good to know before you go
May falls before the Central Pacific hurricane season, which runs from June 1 to November 30, so the month sits outside the official season. With a rental car, the Pali Lookout and Waimanalo are simple to get to, and the one date to reserve ahead is Memorial Day weekend. Most stays in Kailua are vacation rentals, which carry the taxes below.
| Fee | Amount | Who pays |
|---|---|---|
| State transient accommodations tax | 11% | Guests staying in Kailua |
| Oahu county accommodations tax | 3% | Guests staying in Kailua |
Kailua in May vs April and June
Moving a month earlier gives you nearly the same weather, with slightly cooler air and a sea that feels a touch fresher. April is often closer to spring break time, so the beach can be busier, and Lei Day has not yet arrived. The rain is about the same, in short showers.
Moving a month later brings warmer air and water, a bit more rain on the table, and the start of the summer family season. June also brings Kamehameha Day on June 11, a local holiday with parades and lei draping. The hurricane season begins on June 1, which is worth knowing when you book.
Choose May if you want a balance of warm days, easy beaches and a town that is not yet packed. Shift to June if you want the warmest swimming and do not mind more families. Shift to April if you want a spring trip and are happy with a slightly cooler sea.
Is May a good time to visit Kailua?
Yes, May suits beach lovers, paddlers, families and anyone who wants warm, easygoing days without the heaviest crowds.
Early risers will love it most, with calm mornings for kayaking and sunrise walks. Hikers do well with the early starts on the Lanikai ridge. Travelers who need a guaranteed dry sunny week might prefer a leeward coast, since Kailua gets passing showers and cloud from the trade winds.
On arrival, walk to Kailua Beach first, get your bearings with a swim and a look at the wind, then plan your paddling for the next calm morning. What stays with you from May here is the mix of Lei Day flowers, soft light on the Mokulua islands and a town still unhurried before summer.
Sources
- NOAA NCEI, monthly normals 1991-2020, station USC00513117, 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
- NWS Honolulu (HFO), Climate of Hawaii
- Hawaii Department of Taxation, Announcement 2025-03 ; City and County of Honolulu, OTAT FAQ, checked September 25, 2026
- NWS Honolulu / Central Pacific Hurricane Center, « 2026 Central Pacific Hurricane Season Outlook », weather.gov/hfo/hurricaneOutlook2026, checked September 24, 2026