August is the month I tell first-time visitors to grit their teeth about. The weather is hot, the south swell pumps for surfers, the kids are on summer vacation, hotel rates are at their July-August peak — and the islands are also still gloriously between hurricane scares (peak threat windows are mid-August through September). Booking data across Oahu, Maui, and the Big Island for August spans four different years, and what I tell people is this: if you can handle 88°F humidity and book your hotel four months out, August Hawaii is genuinely excellent. If you want shoulder-season prices, wait for late September. Here’s how I plan an August trip end to end.
August Weather: What to Actually Expect
The Honolulu climate normal from NOAA’s National Weather Service shows August averaging 88°F daily high and 75°F overnight low at sea level, with about 0.5 inches of total rainfall for the month — the second-driest month of the year on Oahu’s south shore (per weather.gov/hfo/climate). Trade winds blow 10 to 18 mph out of the northeast 85% of August days. Humidity hovers around 65 to 75%.
That sounds simple but the practical effect is uneven across the islands. The east-facing windward sides (Hilo Big Island, Kaneohe Oahu, Hana Maui, Princeville Kauai) get 4 to 6 inches of rain in August even though the leeward resort coasts get less than an inch. The reason is orographic uplift — moist trades hit the mountains, dump water on the windward side, and arrive dry on the leeward (Kona, Waikiki, Wailea, Poipu). When you pick where to stay in August, “leeward” is the magic word for sunny days.
The August UV index runs 11 to 12 at solar noon — the maximum on the standard scale, the same intensity as the Sahara at the equator. The CDC recommends SPF 30+ reapplied every 2 hours; on Hawaii leeward beaches in August I reapply every 90 minutes and still come home with a tan line. Reef-safe sunscreen has been state law since January 1, 2021 (per Hawaii Department of Health Act 104) — oxybenzone and octinoxate are banned at retail, so bring your own mineral zinc.
Why August Is Hawaii’s Peak Surf Month
The south shore from about Diamond Head through Ala Moana to Waikiki gets its biggest reliable swell window from June through September, with August historically producing the largest south swells of the year. Storms 4,500 miles south of Hawaii in the Southern Ocean fire long-period south swell at the islands; by the time it reaches Waikiki, 10-second period waves are stacking up to 3 to 6 feet on standard days and 8 to 12 feet on the swell-peak days (about 5 to 7 days a month in August).
That’s why August is also when the Vans Triple Crown season kicks off observationally even though the contests themselves run in November-December on the North Shore. South-shore Oahu surfers — locals and traveling pros — track the south buoy reports daily. The official source is the NOAA NDBC buoy 51002; you’ll see the period and direction every 30 minutes for free.
Not a surfer? August remains one of the strongest months for surf lessons on Waikiki for two reasons: the swell is reliably knee-to-waist-high inside the reef, and the water is at its warmest of the year (about 81°F per NOAA’s Honolulu sea-surface temperature average). Group lessons at Waikiki run $80 to $120 per person for 2 hours including board rental in 2026. Private lessons run $180 to $240.
August Crowd Levels and Hotel Pricing
August is peak family-travel season in Hawaii. Hawaii Tourism Authority arrivals data shows August consistently lands in the top 3 months for total visitor count, with about 850,000 to 950,000 monthly arrivals across the islands in recent pre- and post-pandemic years (see Hawaii Tourism Authority research). Schools on the U.S. mainland start back between August 8 and August 25 depending on state, so the crowd thins noticeably in the final week of August — that’s a real shoulder window I aim for.
Hotel pricing in August matches the demand. From the rates I tracked across 2024 and 2025, a Waikiki mid-tier hotel (Hyatt Place, Outrigger Reef) ran roughly $310 to $420 a night during the first three weeks of August, then dropped to $240 to $310 in the final week and into early September. A Maui resort (Hyatt Regency Kaanapali, Sheraton Kaanapali) ran $580 to $780 in early-to-mid August, dropping to $440 to $560 by early September. Big Island Kona resorts run about 15% cheaper than Maui all August.
The cheapest August trip I’ve ever taken started August 26 and ran through September 4 — booking that one week later than the family-vacation crowd saved me roughly 28% on the same hotel. If your dates are flexible, target an August 23 to September 5 stay.
Hurricane Season: The August Risk
August through October is the peak of Central Pacific hurricane season. The National Weather Service’s Central Pacific Hurricane Center (in Honolulu) has tracked roughly 4 to 5 named tropical cyclones per August through October season since 1971 (per NHC climatology), but the vast majority pass south of the islands without making landfall. A direct hit is rare — Hurricane Iniki on Kauai in September 1992 was the last major direct strike — but tropical storms passing within 200 miles can dump 4 to 8 inches of rain in 24 hours and shut down beach access.
I treat August trips like beach trips to the Caribbean: I book refundable hotel rates when possible, I buy travel insurance with hurricane-disruption coverage, and I check nhc.noaa.gov daily starting 10 days out. If a storm is forecast to track within 300 miles, I shift my plans toward the windward Big Island (which gets hit less than Kauai or Maui by storms that approach from the south). Detailed risk-windows by month are covered in our Hawaii hurricane season guide.
Best Things to Do in Hawaii in August
Some August activities are uniquely good because of the season. Others I steer people away from because there are better months for them. The ranked picks:
- South-shore surf or surf lessons — peak south swell month. Waikiki, Ala Moana Bowls (for advanced), Kewalo Basin.
- Snorkeling Honolua Bay (Maui) — calm summer water, 30-foot visibility, marine reserve since 1978. The bay is a winter break November to March, so August is prime.
- Big Island stargazing on Mauna Kea — dry August skies and 13,800-foot elevation give some of the clearest viewing on Earth. See our Mauna Kea stargazing guide.
- Lava and crater viewing — Kilauea has been intermittently erupting since 2021; check current activity at the USGS Kilauea page.
The second-tier picks, still excellent but with caveats:
- Hike Haleakala (sunrise or sunset) — August sunrise reservations book up; reserve through recreation.gov 60 days ahead.
- Diamond Head hike — closed before 6 a.m. Reserve the now-required non-resident slot at Diamond Head State Monument; $5 per person plus $10 vehicle.
- Maui’s Hana Highway — green and waterfall-flush in August. Leave Paia by 7 a.m.
- Aloha Festivals events (begin late August) — month-long celebration of Hawaiian culture across all islands.
What to skip in August: humpback whale-watching (whales are gone until late November — our whale season guide covers timing), Honolua Bay surfing (it’s flat all summer), or any north-shore Oahu swimming with young kids who can’t read shore-break warning signs.
Best Hawaiian Island for August
Not all islands hit the same in August. The leeward weather pattern matters most.
| Island | August grade | Why |
|---|---|---|
| Oahu (south shore) | A | Peak south swell, warmest water, most lessons + restaurants |
| Maui (south + west) | A- | Calm Wailea/Kapalua water, Honolua snorkeling, lower hurricane risk |
| Big Island (Kona side) | A- | Driest coast in August, Mauna Kea clear, Kilauea access |
| Kauai (Poipu side) | B+ | Sunny south coast but slightly higher tropical-storm exposure |
| Lanai / Molokai | B | Quiet and dry but limited services for first-time visitors |
The grading is based on dry-coast weather, water temps, hurricane exposure, and crowd density.
The strongest single-island August pick is south-shore Oahu (Waikiki or Ko Olina). For a multi-island trip with kids, I do 4 days Oahu plus 4 days Maui. For a couples trip, I do Big Island Kona side end to end. We dig into trade-offs further in our best time to visit each island guide and the best Hawaiian island breakdown.
What August Costs
Total trip costs for a 7-day August Hawaii vacation for a family of four, mid-tier hotel, based on tracked 2025 booking data adjusted to 2026 prices. Start with flights:
- Flights from West Coast US (LAX/SEA/SFO): $480 to $720 per adult round-trip, $360 to $560 per child
- Flights from East Coast / Midwest: $720 to $1,100 per adult round-trip
Then hotel rates by island:
- Hotel (Waikiki mid-tier): $310 to $420 a night × 7 = $2,170 to $2,940
- Hotel (Maui resort): $580 to $780 a night × 7 = $4,060 to $5,460
And on-the-ground spend:
- Rental car (compact, including taxes): $65 to $90 a day × 7 = $455 to $630
- Food and activities: $180 to $280 a day for a family of four
A realistic mid-tier 7-day August trip for a family of four to Oahu lands at about $6,500 to $8,500 all-in from the West Coast and $8,500 to $11,000 from the East Coast. A Maui equivalent runs $2,000 to $3,000 more. For deeper detail on what daily life costs once you’re there see our Hawaii cost of living breakdown and grocery prices guide.
What to Pack for Hawaii in August
I pack lighter for August than any other month. The base clothing load:
- 3 to 4 quick-dry T-shirts plus 2 long-sleeve UPF rashguards (the rashguards do most of the sunscreen work)
- 2 pairs of board shorts or swim suits
- 1 pair of closed-toe trail-running shoes (Diamond Head, Koko Crater, lava hikes)
- 1 pair of reef shoes — Honolua Bay entry is sharp lava, not optional
- 1 light fleece for Mauna Kea summit (temps drop to 30 to 45°F at 13,800 feet)
Sun-protection and pest gear that pulls its weight every August day:
- 2 tubes of mineral reef-safe sunscreen — SPF 50 plus a face-specific zinc
- 1 wide-brim sun hat (skip the visor, you’ll regret it)
- Mosquito repellent for east-side Maui and Big Island (DEET 25%+ works, picaridin works too)
- Quality polarized sunglasses (August UV reflects off water at 4x normal intensity)
I do not pack: an umbrella (light passing showers don’t justify it), formal clothes (Hawaii is aggressively casual; an aloha shirt for dinner is the dress code), or jeans (humidity makes them miserable).
Frequently Asked Questions About August Hawaii
Is August a good time to visit Hawaii?
August is one of the best months for sunny leeward weather, warm water, and south-shore surf, but it’s also one of the most expensive and crowded months because of family travel. If you can handle the heat and humidity and book three to four months ahead, August delivers some of the most reliable beach weather of the year. The final week of August offers shoulder pricing once mainland schools restart.
Does it rain in August in Hawaii?
Leeward (south and west) Hawaii coasts get less than an inch of rain in an average August, while windward coasts get 4 to 6 inches over the month. Rain on the leeward side is almost always passing showers that last 5 to 15 minutes. The east-side towns like Hilo, Hana, and Kaneohe see consistent afternoon showers but the morning hours are usually clear.
How hot is Hawaii in August?
The average August daily high in Honolulu is 88°F and the overnight low is 75°F, per the National Weather Service Honolulu climate normals. Trade winds keep the lee shores comfortable most days. The temperature feels hotter on windless afternoons when humidity reaches 80%, particularly inland in the leeward valleys.
Are there hurricanes in Hawaii in August?
August through October is the peak of Central Pacific hurricane season. Roughly 4 to 5 named tropical cyclones form in the basin each season, but direct island strikes are rare — Hurricane Iniki in 1992 was the last major hit. Storms passing within 200 miles can still cause heavy rain and beach closures, so I buy travel insurance and book refundable hotel nights for any August trip.
What is the cheapest week to visit Hawaii in August?
The final week of August (roughly August 23 through August 31) is consistently the cheapest because mainland US schools have restarted and family demand drops. Hotel rates reliably fall 25 to 30 percent compared to early August on the same property. Flights also ease up after August 20.
Can you swim in Hawaii in August?
Yes — August water temperatures average 80 to 81°F across all leeward coasts, which is the warmest of any month. South-shore Oahu, west and south Maui, Kona-side Big Island, and Poipu Kauai all swim great. North-facing beaches are calm in summer; the same beaches turn dangerous in winter. Hookipa Maui and the entire Oahu North Shore remain rip-current risky for non-surfers.
The Bottom Line on August in Hawaii
August is hot, expensive, crowded — and consistently sunny on the leeward coasts where you’ll spend 80% of your trip. If you can shift your dates one or two weeks later than the family-vacation crowd, you get August weather at September pricing. Book hotels three to four months ahead, buy travel insurance, treat hurricane warnings seriously (but don’t cancel over forecasts beyond 5 days out), and aim for south-facing beaches. The south swell, the warm water, the dry skies, and the long sunsets are why August Hawaii sticks in memory long after the credit-card bill clears.
