August in Honolulu means peak-season prices and the warmest ocean water of the year, around 27°C (80°F). That combination tends to define the experience. Families from the U.S. mainland flood Waikiki during summer break, and hotel rates along Kalakaua Avenue reflect it. The weather, to be fair, is genuinely good. Daytime highs sit around 29.4°C (85°F) with lows near 23.3°C (74°F), and August typically sees only 25mm of rain across about 5 days. The trade winds still blow most afternoons, keeping the humidity at a manageable 69%. You'll feel warm, not cooked.
The cultural calendar has some pull this month. Duke's OceanFest takes over the stretch of Waikiki Beach near the Duke Kahanamoku statue in mid-August. Bon Dance festivals run at Buddhist temples across the island on weekend evenings, from Honpa Hongwanji Mission in downtown to Moiliili Hongwanji near the University of Hawai'i. The Made in Hawaii Festival fills the Neal S. Blaisdell Center for three days, usually the third weekend. None of these are Carnival-level spectacles, but they give the month a distinct rhythm.
Here is the honest trade-off. You get reliable sunshine, flat calm water on the south shore, and peak mango season at farmers' markets in Kaka'ako and Kailua. You pay for it with crowds at Hanauma Bay that hit capacity by 9:30 a.m., with Waikiki hotel rates 40-60% above the annual average, and with a faint but real hurricane-season awareness that runs through September. If your schedule is flexible, September and October deliver nearly identical weather at significantly lower prices. If August is your window, though, Honolulu still works. It is not a bad time. It is an expensive one.
Why visit in August
- Ocean temperatures reach their annual peak near 27°C (80°F), making south-shore swimming at Ala Moana Beach Park and Waikiki comfortable for long sessions without a rash guard for warmth.
- August is one of the driest months in Honolulu, with only about 25mm of rain. The trade winds blow consistently from the northeast, so even at 29°C the heat rarely feels oppressive.
- Mango and lychee season peaks at O'ahu farmers' markets. The KCC Farmers' Market at Kapi'olani Community College on Saturday mornings sells Hayden and Rapoza mangoes from North Shore farms at well below typical grocery store prices.
- South shore surf conditions tend to be mellow in August, typically 0.3-0.6m (1-2 ft), which makes Waikiki and Ala Moana Bowls more approachable for beginner and intermediate surfers.
- Cultural events like the Bon Dance season and Duke's OceanFest give the month a local texture that the generic winter tourist season lacks.
Worth knowing
- Peak-season hotel pricing. Expect to pay 40-60% above Honolulu's annual average for a room in Waikiki, and 20-30% more in neighborhoods like Kailua and the North Shore.
- Hanauma Bay Nature Preserve hits its daily visitor cap (often by 9:30 a.m.) most days in August. The online reservation system opens at 7 a.m. two days ahead, and slots disappear within minutes.
- Hurricane season runs June through November, and August sits at the statistical peak. Direct hits on O'ahu are rare (the last significant one was Hurricane Iniki in 1992, which struck Kaua'i), but tropical weather systems can bring vog, swells, and flight disruptions even when they pass south of the islands.
- Waikiki Beach between the Royal Hawaiian Hotel and the Moana Surfrider gets genuinely packed by mid-morning. You might find yourself with about 1.5 meters of sand between your towel and a stranger's.
Best for
Think twice if
August in Honolulu is warm and dry by island standards. The northeast trade winds blow on roughly 80-90% of days, which keeps the humidity from becoming stifling. Morning cloud buildup over the Ko'olau Range sometimes sends brief showers into Manoa Valley, but they rarely reach Waikiki or Ala Moana. The air smells like plumeria and warm asphalt. Nights stay mild, around 23°C, the kind of temperature where you can eat dinner outside on a Chinatown patio and still feel comfortable at 10 p.m. On the handful of days when the trades stall, you will notice. The humidity climbs, the air feels heavy, and even locals look for shade. These "kona weather" days happen maybe 3-4 times in August and usually break within 48 hours.
Seasonal caution
- August falls within the Central Pacific hurricane season (June 1 through November 30). Direct landfalls on O'ahu are statistically uncommon, but tropical systems passing south of the islands can generate large south swells, high surf advisories, and flight delays. Monitor the Central Pacific Hurricane Center forecasts if a storm is tracking near the islands.
- Vog (volcanic fog) from Kilauea on the Big Island can drift to O'ahu when trade winds weaken. On kona-wind days in August, air quality around Honolulu may drop enough to affect visitors with respiratory sensitivities. The Hawai'i Department of Health posts daily vog forecasts.
Year-round climate
Averages from the last 5 years.
| Month | Avg high (°C) | Avg low (°C) | Rainfall (mm) |
|---|---|---|---|
| Jan | 26 | 20 | 71 |
| Feb | 25 | 20 | 44 |
| Mar | 26 | 20 | 58 |
| Apr | 26 | 21 | 59 |
| May | 27 | 22 | 60 |
| Jun | 28 | 23 | 17 |
| Jul | 29 | 23 | 18 |
| Aug | 29 | 23 | 25 |
| Sep | 29 | 23 | 19 |
| Oct | 29 | 23 | 28 |
| Nov | 27 | 22 | 31 |
| Dec | 26 | 21 | 72 |
Best things to do in August
Snorkeling at Hanauma Bay Nature Preserve
natureThe sheltered bay on O'ahu's southeast coast sits inside a volcanic crater. August's calm conditions and warm 27°C water make visibility consistently good, often 10-15 meters. Green sea turtles, parrotfish, and humuhumunukunukuapua'a (reef triggerfish) are common sightings in the inner reef.
August's flat south-shore conditions and minimal rainfall produce some of the clearest water of the year at Hanauma Bay.Booking tipReserve online at 7 a.m. HST exactly two days before your visit. Slots fill within minutes during August. The bay is closed on Mondays and Tuesdays.
Surf lessons at Waikiki
water sportsThe stretch of reef break between Canoes and Queens in Waikiki produces small, slow-rolling waves that are ideal for standing up on a longboard for the first time. Water temperature of 27°C means you can stay in for 2 hours without getting cold. Dozens of surf schools operate from the beach near the Duke Kahanamoku statue.
South shore swells drop to their smallest in August, typically 0.3-0.6m (1-2 ft), making Waikiki one of the most forgiving places to learn to surf anywhere in the Pacific.Hiking the Koko Head Crater Trail
hikingThe 1,048-step railway-tie staircase climbs 330 meters up the side of Koko Head crater on O'ahu's southeast coast. The summit view takes in Hanauma Bay, the Windward Coast, and Diamond Head. Start before 7 a.m. to beat the heat. There is no shade on the trail.
August's dry conditions mean the railway ties are not slippery, and the low chance of rain makes early-morning summit views reliably clear.Kayaking to the Mokulua Islands from Lanikai Beach
water sportsThe twin Mokulua Islands sit about 1.2 km offshore from Lanikai Beach in Kailua. Moku Nui, the larger island, has a small beach where you can land and explore tide pools. The paddle takes about 30-45 minutes each way in August conditions.
August trade winds are steady but manageable, and the lack of large swells makes the channel crossing between Lanikai and the Mokuluas safer than winter months.Booking tipRental kayak outfitters in Kailua typically require reservations in August. Twogood Kayaks has been operating the route for decades.
Visiting Pearl Harbor and the USS Arizona Memorial
historyThe National Memorial sits above the sunken USS Arizona in Pearl Harbor. You can still see oil seeping from the hull, 80+ years after the December 7, 1941 attack. The memorial, museum, and the USS Missouri battleship (where Japan signed the surrender in 1945) are all within the same complex.
No month is better than another for the memorial itself, but August crowds mean same-day walk-in tickets are rarely available. Booking the free timed-entry tickets online well in advance is the only reliable option.Booking tipFree timed-entry tickets for the USS Arizona Memorial release online 60 days in advance. August dates sell out quickly. Check recreation.gov.
Sunset sailing off Waikiki
water sportsCatamarans depart from Waikiki Beach most evenings for 90-minute sunset sails along the south shore. August sunsets happen around 7:10 p.m., and the sky over the Wai'anae Range tends to produce vivid color. Humpback whales are absent this time of year (they return November through April), but spinner dolphins sometimes appear.
August has among the highest percentage of clear evenings in Honolulu, and the sunset angle over the Wai'anae Mountains produces reliably good light.Exploring Chinatown's food scene
foodHonolulu's Chinatown district, roughly bounded by River Street, Beretania Street, and Nu'uanu Avenue, packs dim sum houses, Vietnamese pho shops, Filipino bakeries, and open-air produce markets into a few walkable blocks. The Oahu Market on North King Street sells fresh fish and prepared foods. The neighborhood is grittier than Waikiki and more interesting for it.
Summer fruit season fills the Chinatown markets with local mango, lilikoi, and starfruit that you won't find in Waikiki shops.What to eat in August
In season: fruit
Hayden and Rapoza mangoes
August is the tail end of Hawai'i mango season, and local varieties like Hayden and Rapoza still appear at farmers' markets in Kailua and at the KCC Farmers' Market. The Rapoza, developed on O'ahu, has a firmer texture and less fiber than most mainland varieties. Farmstand prices tend to run well below what mainland grocery chains charge for imported mangoes.
Lilikoi (passion fruit)
Lilikoi season overlaps with August on O'ahu. The tart, fragrant pulp shows up in everything from butter to cheesecake at bakeries like Liliha Bakery on Kuakini Street. The smell alone, sharp and tropical, is hard to forget.
On menus now
Shave ice
Shave ice shops do their biggest volume in August. Matsumoto Shave Ice in Haleiwa on the North Shore has had lines out the door since 1951. In town, Waiola Shave Ice in Mo'ili'ili uses a finer blade that produces a snow-like texture, and their azuki bean and condensed milk combination is a local standard. The texture difference between good shave ice and a mainland snow cone is striking, almost creamy when shaved properly.
Poke
Poke is available year-round, but August's warm waters bring ahi (yellowfin tuna) closer to shore around O'ahu. Ono Seafood in Kapi'olani has been a benchmark since the 1990s. The shoyu and sesame oil versions move fast. Foodland supermarkets run a surprisingly good poke counter if the specialty shops are too crowded.
Regular events in August
Duke's OceanFestFree
A week-long ocean sports festival held at Waikiki Beach near the Duke Kahanamoku statue. Events include longboard surfing, paddleboard racing, swimming races, and a surf polo competition. Named for Duke Kahanamoku, the Olympic swimmer and father of modern surfing, who grew up on this stretch of beach.
Mid-August (usually the second or third week)Bon Dance festivalsFree
Buddhist temples across O'ahu host Bon Dance festivals on weekend evenings throughout July and August. The dances honor ancestors with taiko drumming, folk dancing in yukata robes, and food stalls selling andagi (Okinawan doughnuts) and shave ice. Honpa Hongwanji Mission downtown and Moiliili Hongwanji near UH Manoa are two of the larger gatherings.
Weekends throughout AugustMade in Hawaii Festival
Three-day showcase of Hawai'i-made products at the Neal S. Blaisdell Center in Kaka'ako. Over 400 vendors sell food, crafts, clothing, and art. The food section alone, with samples of local jams, sauces, macadamia nut products, and coffee, can fill an afternoon.
Third weekend of AugustAloha FestivalsFree
The lead-up to Hawai'i's largest cultural celebration begins in late August with the opening ceremony. The main events, including the Waikiki Ho'olaule'a block party and the Floral Parade, typically fall in September, but August kicks off the season with royal court investitures and community events.
Late August through SeptemberBest places this August
Ala Moana Beach Park
beachA long, crescent-shaped beach with a protected reef that keeps the water calm and shallow. Less crowded than Waikiki, with better swimming conditions for small children. The park's grassy areas fill with local families on weekends. Magic Island, the peninsula on the eastern end, has excellent sunset views toward Diamond Head.
Ala MoanaDiamond Head State Monument
hikingThe 0.8-mile trail to the 232-meter summit of this volcanic crater takes about 30-45 minutes. The view from the top covers Waikiki, the south shore, and Koko Head. Go before 8 a.m. in August to avoid both the heat and the crowds. The trail involves steep stairs and a short tunnel.
KaimukiKCC Farmers' Market
marketKapi'olani Community College hosts O'ahu's best-known farmers' market on Saturday mornings from 7:30 to 11 a.m. North Shore farm stands sell seasonal fruit, local honey, and fresh-pressed sugarcane juice. The prepared food stalls serve everything from pork belly bao to acai bowls.
KaimukiManoa Falls Trail
hikingA 1.6-mile round-trip trail through a lush rainforest that ends at a 46-meter waterfall. The trail stays shaded by banyan and eucalyptus canopy, which makes it more comfortable than exposed hikes like Diamond Head. The path can be muddy even in dry August, so wear shoes with grip.
ManoaShangri La Museum of Islamic Arts, Culture & Design
museumDoris Duke's oceanfront estate in the Kahala neighborhood houses one of the world's finest private collections of Islamic art, with over 2,500 pieces collected from Iran, Morocco, Turkey, and India. Tours depart from the Honolulu Museum of Art in Makiki. The architecture and gardens alone, set on a rocky point above the ocean, are worth the visit.
KahalaNorth Shore (Haleiwa)
neighborhoodThe 45-minute drive from Waikiki to Haleiwa on the North Shore passes through pineapple fields and along the Kamehameha Highway. In August, the ocean is flat, making it a swimming and snorkeling coast rather than a surf-watching one. Haleiwa town has a handful of good food trucks and Matsumoto Shave Ice, which has been operating since 1951.
North ShoreBishop Museum
museumHawai'i's largest museum, founded in 1889 in the Kalihi neighborhood, holds extensive collections of Polynesian artifacts, Hawaiian royal regalia, and natural history specimens. The Hawaiian Hall, a three-story Victorian gallery, displays feather cloaks, carved ki'i (temple images), and outrigger canoes. The planetarium runs shows daily.
Kalihi
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Insider tips
The Waikiki Beach stretch in front of the Royal Hawaiian Hotel gets packed early, but if you walk 10 minutes west past the Hilton Hawaiian Village to Fort DeRussy Beach Park, you'll find significantly more space and the same water. Locals tend to swim at Ala Moana Beach Park instead of Waikiki entirely.
For Hanauma Bay, set a phone alarm for 6:55 a.m. HST two days before your target date. Open the reservation page and refresh at exactly 7:00. Slots typically fill within 5-10 minutes in August. Midweek dates are slightly easier to book than weekends.
The city bus (TheBus, Route 22) runs from Waikiki to Hanauma Bay. It costs a fraction of a taxi, takes about 30 minutes, and drops you at the entrance. Worth knowing since parking at the bay fills early.
Sunset from Magic Island at the eastern tip of Ala Moana Beach Park is as good as any paid sunset cruise, with Diamond Head framing the view. Bring a towel and arrive 30 minutes before sunset to find a spot on the rocks.
Chinatown's best eating is on side streets off North Hotel Street and along Maunakea Street. The dim sum at Legend Seafood in the Chinatown Cultural Plaza starts serving at 10:30 a.m. and tends to be better at opening than in the afternoon.
The windward side of O'ahu (Kailua, Lanikai, Kane'ohe) runs 2-3°C cooler than Waikiki in August because of the trade winds coming off the ocean. On kona-weather days when Waikiki feels stifling, Kailua Beach is noticeably more comfortable.
Avoid these mistakes
- Assuming you can walk up to Hanauma Bay without a reservation. The online booking system has been mandatory since 2021, and August is the hardest month to get a slot. Showing up without one means getting turned away.
- Spending every day in Waikiki. The 4-block tourist strip around Kalakaua Avenue is the least representative part of Honolulu. Chinatown, Kaimuki along Waialae Avenue, and Kailua town each have more local character and better food options.
- Skipping sunscreen reapplication while snorkeling. The water magnifies UV exposure, and you lose sunscreen faster than you think. Reapply every time you get out of the water, even if it has only been 45 minutes.
- Driving to the North Shore on a Saturday or Sunday without an early start. The H-2 northbound and Kamehameha Highway back get congested, especially between 10 a.m. and 2 p.m. on weekends. Leave Waikiki by 8 a.m. or go on a weekday.
- Not drinking enough water on hikes. Koko Head Crater Trail has zero shade, and Diamond Head has limited shade. Dehydration and heat exhaustion send tourists to the ER every August. Bring at least 1 liter per person for either hike.
Practical tips for August
Book Hanauma Bay reservations and Pearl Harbor (USS Arizona Memorial) tickets online well before your trip. Both operate on timed-entry systems that sell out during August. Hotel rates in Waikiki are at their annual peak in August, so booking 2-3 months ahead tends to secure better rates than last-minute searches. If you plan to drive the North Shore or Windward Coast, reserve a rental car early, as inventory tightens in peak season. Reef-safe sunscreen is required by Hawai'i state law, so check your sunscreen ingredients before packing or plan to buy compliant brands on arrival. TheBus covers most of O'ahu and is a practical alternative to renting a car for Waikiki-based visitors. The Honolulu rail transit line (Skyline) connects Daniel K. Inouye International Airport to Aloha Stadium, with further extensions in progress.
FAQ
Is August a good time to visit Honolulu?
August is a good but expensive time to visit. The weather is reliably warm and dry, with average highs around 29.4°C (85°F) and minimal rainfall. Ocean temperatures reach their annual peak near 27°C (80°F). The trade-off is peak-season pricing and heavy crowds at popular spots like Hanauma Bay, Diamond Head, and Waikiki Beach. If your travel dates are flexible, September and October offer nearly identical weather with noticeably lower hotel rates.
How hot does Honolulu get in August?
Daytime highs in Honolulu average about 29.4°C (85°F) in August, with overnight lows around 23.3°C (74°F). The northeast trade winds blow on roughly 80-90% of August days, which keeps the humidity from feeling overwhelming. On the 3-4 days per month when the trades stall (locals call it kona weather), the humidity spikes and the heat feels heavier. These episodes typically break within 48 hours.
Can you surf in Honolulu in August?
The south shore (Waikiki, Ala Moana) has small, gentle waves in August, typically 0.3-0.6m (1-2 ft), which makes it ideal for beginner lessons. The North Shore is essentially flat, with Pipeline, Sunset Beach, and Waimea Bay barely breaking. If you want big waves, you need to come between November and February, when north swells regularly reach 3-5 meters.
Is there a hurricane risk in August?
August falls within the Central Pacific hurricane season (June through November). Direct landfalls on O'ahu are statistically rare. The last major hurricane to hit the Hawaiian Islands was Hurricane Iniki in 1992, which struck Kaua'i rather than O'ahu. That said, tropical systems passing south of the islands can generate large swells, rain bands, and flight disruptions. Monitor the Central Pacific Hurricane Center if a storm is in the area.
Do I need a car in Honolulu in August?
For Waikiki and central Honolulu, no. TheBus covers most tourist areas, and the new Skyline rail connects the airport to Aloha Stadium. However, a rental car is useful for day trips to the North Shore (about 45 minutes from Waikiki), the Windward Coast, and trailheads like Koko Head. Reserve early in August, as rental car availability tightens during peak season.
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