By mid-morning in May, the black sand at Punaluu feels warm beneath your feet, and Hawaiian green sea turtles come ashore to settle in and rest as waves glide across those dark grains. The trade wind makes the coconut palms rustle, and along the Kau coast the road stays quiet. It is a month of easy beach mornings and slow drives on the south side of the Big Island, with the long summer light just beginning.
Punaluu sits on the southeast shore of the Big Island, between Volcanoes National Park and the ranch country of Kau. It is a small place with a famous beach, and May suits it well.
What is the weather like in Punaluu in May?
May in Punaluu is warm, mostly dry and bright, with only a few short showers, so you can plan outdoor days with confidence in a T-shirt and shorts. The month sits between a slightly wetter April and a drier June.
| Month | Average high (°F) | Average low (°F) | Rain days | Sea (°F) |
|---|---|---|---|---|
| April | 80.4 | 67.1 | 3.6 | 76.2 |
| May | 81.6 | 68.2 | 3.2 | 77.4 |
| June | 82.5 | 69.7 | 1.9 | 78.0 |
Mornings are the best hours. The air is soft, the sky is often clear over the Kau coast, and the light on the black sand is sharp enough to make the green of the palms look painted. In the early afternoon, clouds often gather above the slopes of Mauna Loa at your back, and on that open beach without shade, the sun can feel intense.
Punaluu is on the windward, southeast side of the island, so rain here comes as brief passing showers carried in by the trade winds, often in the evening or overnight. It is far gentler than the downpours of Hilo up the coast, and much less than the cooler, wetter rim of Volcanoes National Park. A thin rain jacket is enough.
Evenings stay mild, comfortable enough to eat outside with a light layer. Daylight lasts a little over thirteen hours in mid-May, which leaves long afternoons for the drive back along the coast.
Can you swim in Punaluu in May?
In May the ocean is warm enough for a pleasant dip, with temperatures near the upper 70s, but the beach is better suited to wading, watching and resting than to swimming laps.
With nothing offshore to blunt the incoming swell, Punaluu takes the open ocean head on, and the seafloor falls away fast near the beach. Waves and currents can be strong here, and the surf is often choppy. Many visitors paddle at the edge, cool off in the shallows and spend their time on the sand. Heed the posted signs at the beach and whatever the lifeguards advise, and when the water turns rough, keep out.
Snorkeling is not the draw here as it is on the Kona side, where the water is clearer and calmer. The big attraction is the turtles. They are protected, so watch them from a respectful spacing and never touch them or chase them. Bring water shoes if you want to walk the rocky edges, and mineral sunscreen, since the sun is strong and the beach has little shade.
What to do in Punaluu in May
May has no single headline festival in Punaluu itself. What the month gives you is the quiet. The island’s spring break crowds have gone, summer is not yet in full swing, and the dry stretch makes the Kau coast one of the nicest places to be outdoors. Lei Day on May 1 is celebrated across Hawaii with flower leis, hula and music, and you may see it marked in small ways around the island.
Punaluu Black Sand Beach
The beach is the reason to come. Black sand forms where lava meets the ocean and shatters into fine grains of basalt, and at Punaluu the strip is edged by coconut palms and a scatter of lava rock. Green sea turtles, called honu, frequently settle on the sand to rest or graze on algae near the shore, especially during the morning and late afternoon.
Plan on an hour or two, longer if you like to sit and watch. Mornings are cooler and usually less busy, while midday brings tour stops and strong sun. Keep your distance from the turtles, and do not take any of the black sand home, as it is part of the place. Pack a hat, water and a picnic, since the area offers few services.
The Kau coast and Volcanoes National Park
From Punaluu, the highway climbs through open ranch country and old sugar land toward Volcanoes National Park, so the two make a natural pair. The coast is warm and sunny, while the crater rim is cooler and often misty. Bring a layer for the park, and expect a very different feel within a short drive.
Along the way you pass roadside stands, small towns and wide views of the sea and Mauna Loa. Stop for fruit or a plate lunch where you see a place with cars outside, and take your time on the road, as it is one of the island’s most scenic drives.
Food and the small pleasures
Eating here is simple and local: plate lunches with rice and macaroni salad, fresh poke, malasadas from a bakery, and shave ice on a warm afternoon. Kau is also coffee country, and tasting a cup of locally grown beans is an easy way to spend a rest stop.
There are few restaurants right at the beach, so pick up food in the nearby towns on your way. A picnic on the grass above the sand, with the sound of surf and wind in the palms, is one of the nicest meals of the trip.
A two-day itinerary for Punaluu in May
Then take a slow drive along the coast, stopping at a roadside stand for fruit or a plate lunch in one of the small Kau towns.
In the afternoon, when clouds gather and the sun is hottest, head up toward the cooler air of the highlands. Return to Punaluu around sunset for the long light on the water, and eat a simple dinner at a local spot in the area.
Day 2 is for the mountain side. In the morning, head up to Volcanoes National Park, where the air feels crisp and the crater views are at their sharpest. Bring a rain jacket, since the rim often gets showers even when the coast is sunny. Walk a short trail, visit the overlooks and take your time.
If the weather turns wet, the park’s visitor center and museum offer a dry stop, and a coffee farm tasting in Kau makes a good indoor alternative. Finish the day with a relaxed meal and an early night, as the roads are dark after sunset.
Is Punaluu busy in May?
In May, Punaluu tends to be calm, drawing a regular trickle of day visitors, though it is never as busy as it gets in winter or summer. The beach gets its busiest in the middle of the day, when tour groups stop, and empties out by late afternoon.
Spring break has ended and the big summer family weeks have not started, so rooms, rental cars and tables are generally easier to find than at holiday times. Accommodation near Punaluu is limited, with small vacation rentals and inns, so book ahead anyway, and earlier if your dates fall near Memorial Day weekend, which draws more travelers across the islands.
Since public transit is limited and the distances are long, renting a car is the sensible way to travel. Fill the tank before heading down the coast, and book the car early if you are flying in around a holiday weekend. For other parts of the island, reservations are needed at some parks and sights, so check the official park pages when you plan.
What to pack for Punaluu in May
Pack for sun, wind and a quick change of weather between the coast and the mountain.
- Mineral sunscreen and a wide-brimmed hat, because the black sand has little shade
- For quick showers and the chillier crater rim, bring a light rain jacket.
- Water shoes for the rocky edges of the beach
- A warm layer for Volcanoes National Park
- A reusable water bottle and a picnic bag for long days with few services
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. Services around Punaluu are thin, so bring food and water, and plan your gas and meals in the larger towns. Lodging carries state and county accommodation taxes on top of the room rate.
| Fee | Amount | Who pays |
|---|---|---|
| State Transient Accommodations Tax | 11.00% | Guests of hotels and rentals |
| County of Hawaii Transient Accommodations Tax | 3% | Guests of hotels and rentals in the county |
Punaluu in May vs April and June
Moving a month earlier to April brings slightly more rain and a touch cooler sea, with a few more showers, and the spring break crowds across the islands. The beach is much the same, but your odds of a dry day are a little lower.
Moving a month later to June means drier air, warmer water and longer days, with summer family travel starting to fill the islands. The hurricane season also begins on June 1. Punaluu itself stays quiet, but rooms and rental cars elsewhere get tighter.
Choose May if you want the balance: mostly dry, warm sea and a calm beach. Pick June if heat and the driest weather matter most, and April only if your dates are fixed.
Is May a good time to visit Punaluu?
Yes, May is a very good time for travelers who want a quiet, sunny stretch of the Big Island’s south coast, with turtles on the sand and room to move.
It suits anyone who likes slow drives, short walks and long picnic afternoons. It is less suited to travelers who want lively nightlife, resort pools or a calm swimming beach, since Punaluu is a place to watch the sea rather than play in it.
On arrival, go to the beach first thing in the morning, before the tour stops, and spend time with the turtles. What makes May special here is the stillness: warm black sand, a steady trade wind and a coast that feels like it belongs to you.
Sources
- NOAA NCEI, monthly normals 1991-2020, station USC00518600, 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 Hawaii, Department of Finance, Transient Accommodations Tax (TAT) page, hawaiicounty.gov/departments/finance/transient-accommodations-tax-tat (live returned HTTP 403 on request, read via Internet Archive Wayback Machine snapshot dated August 14, 2026, same official content), 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 USW00021510
- NOAA NCEI, monthly normals 1991-2020, station USW00021504
- NWS Honolulu / Central Pacific Hurricane Center, « 2026 Central Pacific Hurricane Season Outlook », weather.gov/hfo/hurricaneOutlook2026, checked September 24, 2026