Hawaii's best all-round window is the autumn shoulder, September into October: the official DBEDT count makes September the quietest month of the year, the sea is at its warmest at about 81F (27C), and the trade winds are still blowing. Whale season peaks from January to March, big-wave surf belongs to north shores from November to February, and the twin crowd peaks are July and the Christmas fortnight in December.
Hawaii does not do seasons the way the mainland does. Honolulu's average high moves only from 81F in winter to 89F in August, so "when to go" is really decided by four other calendars: rainfall, surf, whales and people. This planner is built on NOAA's 1991-2020 climate normals and the Hawaii Department of Business, Economic Development and Tourism (DBEDT) visitor statistics. It is worth saying plainly, because the previous version of this guide did the opposite: no crowd figure appears here unless DBEDT published it. Precise-sounding percentage claims about empty beaches are a genre of fiction; the honest numbers are below.
Two more framing facts shape everything. Hawaii's wet season runs from November to April, when the trade winds weaken and Pacific storms bring most of the rain; May to October is warmer, drier and steadier. And the islands face two ways: windward (east) coasts catch the trades and the rain, leeward (west and south) resort coasts sit in the rain shadow. Hilo, on Hawaii Island's windward side, averages about 129 inches of rain a year; Kailua-Kona, on the same island's leeward coast, averages under 10. Where you stay can matter more than when.
The year at a glance
| Month | Honolulu high / low (F) | Rain (in) | Sea (F, approx) | The pattern |
|---|---|---|---|---|
| January | 81 / 67 | 2.3 | 77 | Whales building, big north surf |
| February | 81 / 67 | 2.0 | 76 | Whale peak, wet season |
| March | 81 / 68 | 2.0 | 76 | Spring break, whales still strong |
| April | 83 / 70 | 0.6 | 77 | Dry season begins |
| May | 85 / 72 | 0.6 | 78 | Whales leave, south swells start |
| June | 87 / 74 | 0.3 | 79 | Driest month, crowds build |
| July | 88 / 75 | 0.5 | 80 | Peak crowds (DBEDT) |
| August | 89 / 76 | 0.6 | 80 | Warmest month, crowds step down |
| September | 88 / 75 | 0.7 | 81 | Quietest month (DBEDT) |
| October | 87 / 74 | 1.8 | 81 | Quiet, Ironman in Kona |
| November | 84 / 72 | 2.4 | 79 | Wet season starts, whales return |
| December | 82 / 69 | 3.2 | 78 | Peak crowds late month (DBEDT) |
Temperatures and rainfall are NOAA 1991-2020 normals for Honolulu; rain is the month's normal total and June, not midsummer, is the driest month. Sea temperatures are approximate long-run averages. Crowd labels marked DBEDT are anchored in the official daily visitor census detailed below; the rest follow the school-holiday and season pattern.
January: whales arriving, surf at full size
January pairs the year's coolest air (a Honolulu high of about 81F is "cool" only by Hawaiian standards) with two of its best shows. Humpback whales are building towards their peak in the shallow Maui Nui channels, and Oahu's North Shore is in the heart of big-wave season, when surf over 25 feet occurs many times each winter. Those north-facing beaches are for watching, not swimming, on big days.
It is wet season, so Honolulu averages about 2.3 inches of rain and the trades blow only about half the time; expect passing showers rather than washed-out weeks, worst on windward coasts. The New Year crowd drains away in the first week, leaving the rest of the month comparatively manageable.
February: the whale peak
February is the centre of whale season: NOAA's Hawaiian Islands Humpback Whale National Marine Sanctuary puts the peak from January through March, and February sits squarely in it. Maui is the classic base, with whale watches also running from Oahu and Hawaii Island; boats must keep at least 100 yards from the whales by law.
The weather is January's pattern continued, the state's coldest month statewide by a whisker, with Honolulu at 81F and about 2 inches of rain. North-shore surf is still firing. February's demand is winter-escape demand from the mainland rather than a holiday spike, which makes it busy but rarely frantic.
March: spring break, and Merrie Monarch approaches
March is the wet season's tail. Honolulu still averages about 2 inches of rain, the trades pick up towards 60 to 70 percent of the time, and the whale peak runs through the month. Mainland spring breaks lift family demand, especially around Waikiki.
The month's cultural anchor falls at its end in 2027: the Merrie Monarch Festival, the world's premier hula competition, runs in Hilo from Sunday 28 March to Saturday 3 April 2027 (it begins each year on Easter Sunday). Hilo fills completely for the week, and tickets are allocated by a mail-request system months ahead. If hula matters to you, this is the week to build a year around; if it does not, avoid Hilo that week and enjoy how quiet the rest of Hawaii Island is not.
April: the dry season switches on
April is the hinge month. Honolulu's normal rainfall collapses from about 2 inches to 0.6, highs reach 83F, and the long, dry, trade-wind summer begins. The last whales are leaving through the month (the season runs to May, thinning as it goes), and the North Shore's big surf fades as the south shores start receiving their first summer swells.
That combination, dry weather arriving while the summer crowds have not, is why April quietly pleases people who take it. Easter-week demand depends on the year's calendar; in 2027 Easter falls in late March, so April 2027 starts with the Merrie Monarch crowd in Hilo and then opens out.
May: the gentle month
May completes the turn: Honolulu averages 85F with about 0.6 inches of rain, the trades are settling into their summer reliability, and Waikiki's gentle south-shore breaks start their season, the classic beginner-surf conditions the old version of this guide rightly loved. The North Shore, by contrast, goes calm from about May to September, which converts it from a spectator arena into swimming and snorkelling water.
Whale season ends in May, so do not book a May trip around whales. What May offers instead is summer's weather arriving a month before summer's crowds, the same logic that makes September so good at the year's other end.
June: the driest month, and the season opens
June is statistically Honolulu's driest month (0.26 inches on the normals) with highs of about 87F and the trades at near-summer strength. The sea reaches about 79F. School holidays on the mainland start the build towards the July peak, so the second half of June is noticeably busier than the first.
Two June facts belong in any honest planner. The Central Pacific hurricane season officially opens on 1 June; the risk framing is in the questions below, and the short version is that direct landfalls are historically rare (two since 1950). And June's weather is not uniform across the state: it is the leeward coasts' driest season, while windward Hilo is still taking its roughly 7 inches for the month.
July: the first peak
July is one of Hawaii's two crowd summits, and this time the claim has a source: DBEDT's statistics put July 2025 at 873,430 arrivals with an average of 249,160 visitors in the islands on any given day, the joint-highest daily census of the year. Families own this month, and Waikiki, Kaanapali and the resort coasts run at full stretch.
The weather earns the crowds: highs of about 88F, half an inch of rain in Honolulu, the trades blowing about 90 percent of the time, and the south-shore surf season at its peak. If July is your month, book everything early, and put the hard-to-get reservations (Haleakala sunrise, Haena, Diamond Head) at the top of the list, because they go first.
August: the warmest month, stepping down
August is Hawaii's warmest month, Honolulu averaging an 89F (32C) high, and the sea reaching about 80F. It is also where the summer crowd curve bends: DBEDT counted 806,776 arrivals and a daily census of 221,073 in August 2025, still busy, but clearly down from July as mainland schools go back in stages.
August sits inside the window when tropical systems in the Central Pacific become more likely (the threat ramps up from late July and fades by early October, per the National Weather Service in Honolulu). In practice most Augusts pass without incident; the planning answer is flexibility and a forecast check in the week before travel, not avoidance.
September: the quietest month of the year
September is the month this guide exists to point at. DBEDT's September 2025 figures are the lowest of the year on both measures: 690,858 arrivals and an average daily census of 189,876, roughly 60,000 fewer visitors per day than the July and December peaks. Yet the weather is summer's: Honolulu averages 88F with about 0.7 inches of rain, and the sea is at its annual warmest, about 81F, shared with October.
Culture peaks too: Aloha Festivals, running since 1946, fills Waikiki's September with the Waikiki Hoolaulea street party (19 September in 2026) and the Floral Parade (26 September in 2026), both free. One caution lives here: late September is still inside hurricane season, in its tail.
October: the second trough, with an asterisk
October is the year's other low-crowd month: DBEDT recorded 749,095 arrivals and a daily census of 198,322 in October 2025, second only to September for quiet. The sea holds its 81F peak warmth, and sports takes the stage on Hawaii Island, where the IRONMAN World Championship races in Kailua-Kona in October (Saturday 10 October in 2026), filling Kona for race week while the rest of the state stays calm.
The asterisk is real: October is when the trade winds fail most often, and the National Weather Service notes more flash flooding occurs in October than in any other month, on the back of humid Kona-wind episodes. Hurricane season runs to 30 November, though the threat fades quickly after early October. Quiet, warm and slightly less predictable is the fair summary.
November: the seasons cross
November is the crossing point. The wet season begins (Honolulu's normal rainfall jumps to about 2.4 inches), the first humpbacks arrive to reopen whale season, and the North Shore wakes up as the winter swell machine restarts. The Haleakala sunrise reservation, Diamond Head and Haena systems all keep running; nothing about November makes them easier except lower demand.
Outside the Thanksgiving week bump, November is one of the calmer months to be in Hawaii, and the locals' calendar turns festive. Pack for the possibility of a genuinely wet day, especially on windward coasts, and for summit cold if Haleakala or Mauna Kea is on the list: the high volcanoes sit in the 40s and 50s F in winter while the beach below is at 84F.
December: the second peak, concentrated
December matches July on paper and beats it in practice. DBEDT's December 2025 census, 249,958 visitors on an average day, equals July's, but December's 868,894 arrivals concentrate around the Christmas to New Year fortnight, which makes late December the single most crowded stretch of the Hawaiian year. Early December, before the schools empty, is a different and much calmer trip.
The month also brings Honolulu's wettest weather (about 3.2 inches of rain on the normals), the start of peak whale season, and the North Shore's biggest surf. The Honolulu Marathon runs on Sunday 13 December 2026, a 5:00 a.m. start that fills Waikiki for the second weekend of the month, worth booking around whether you are running it or avoiding it.
The crowd pattern, from the official count
Hawaii's Department of Business, Economic Development and Tourism publishes a daily visitor census, the average number of visitors physically in the islands, which is the honest way to measure crowdedness. In 2025 it described a year with two equal peaks and a deep autumn trough: about 250,000 visitors a day in both July (249,160) and December (249,958); 221,073 in August; then the trough, 198,322 in October and the year's low of 189,876 in September, roughly 60,000 fewer people per day than at the peaks.
That shape, summer peak, autumn trough, Christmas spike, is the durable pattern behind this guide's month verdicts. Where a month's label in the table above is not tied to a DBEDT figure, it follows the US school-holiday calendar that drives Hawaii's family demand, and it is labelled a pattern rather than a statistic for exactly that reason.
West Maui and Lahaina: the honest position
The previous version of this guide recommended West Maui as the first-timer's best base and never mentioned why that needs rewriting. On 8 August 2023, a wind-driven wildfire destroyed most of historic Lahaina town and killed 102 people, in what was reported as the deadliest United States wildfire in more than a century. Any guide that sends you to this coast without saying that is failing you.
Here is the current position, from Maui County and state sources. The West Maui resort corridor north of Lahaina, Kaanapali, Napili, Kahana, Kapalua and Honokowai, was outside the burn area and reopened to visitors in phases, fully on 1 November 2023. It has operated normally since, and the Hawaii Tourism Authority's position is that respectful travel to open areas is welcomed, because it sustains local jobs. Limited commercial boat operations resumed at Lahaina Harbor in December 2025, and one segment of Front Street reopened to vehicles in August 2026 as rebuilding continues.
Lahaina town itself is not open. The historic district is a controlled-access recovery zone: no Lahaina town businesses or historic sites, including Banyan Tree Park, are open to the public, and barriers keep visitors out of damaged areas. The town is a community rebuilding its homes, not a place to sightsee. If you base in West Maui, come as the County asks: support local businesses, follow the access rules, and check MauiRecovers.org for the current position before you go, because the rules change as recovery proceeds.
Timing the big activities
Surf runs on two calendars. North and west shores belong to winter: from about November to February the North Pacific storm track sends frequent large surf, over 25 feet many times each winter, peaking around December and January with the big-wave competitions. South shores belong to summer: swells generated in the South Pacific arrive roughly weekly from about May to September, with Waikiki's long, gentle breaks at their most reliable. Beginners should book lessons on a south shore in summer, or on sheltered breaks with a school in any month, and treat winter's north shores as a grandstand, not a classroom.
Whales are a winter act. Humpbacks are in Hawaiian waters from November to May, peaking January to March, concentrated in the shallow channels of Maui Nui. Whale watching is a boat business in season and a shore sport from west-facing lookouts on calm mornings; the 100-yard approach rule applies to everyone.
Volcano viewing cannot be scheduled. Kilauea, inside Hawaii Volcanoes National Park, is one of the world's most active volcanoes, and its activity changes over time: eruptions start, pause and resume, and whether lava is visible, and from where, depends entirely on the week you go. Vog, the volcanic smog formed from its sulfur dioxide, mainly affects Hawaii Island and drifts further when the trades fail. The only honest planning advice is to check the USGS Hawaiian Volcano Observatory updates and the park's alerts shortly before a Big Island trip, and to treat any guide promising lava on a date as fiction.
Haleakala sunrise is a reservation, not a season. Entry to Haleakala's Summit District between 3:00 and 7:00 a.m. requires a recreation.gov reservation in every month of the year. Reservations open 60 days ahead and a second batch releases 48 hours ahead; popular dates go at the first release. The summit sits above 10,000 feet, where dawn temperatures are in the 30s and 40s F, so the warm layer matters as much as the booking.
Book-ahead list, and the 2026 tax change
- Diamond Head (Leahi), Oahu: non-residents need entry reservations through the Hawaii State Parks system, $5 entry per person and $10 parking per vehicle.
- Haena State Park, Kauai: non-resident entry and parking are by advance reservation only, released 30 days ahead and quick to sell out; entry is $5 per person, and check the Go Haena portal for the current parking total before you budget.
- USS Arizona Memorial, Pearl Harbor: the programme is free, but tickets are released only on recreation.gov (a $1 booking fee), in windows 24 hours and 8 weeks ahead; standby seats exist but cannot be counted on in peak periods.
- Lodging tax: from 1 January 2026, Hawaii's state Transient Accommodations Tax rose from 10.25% to 11% under Act 96, the state's new climate "Green Fee", on top of the 3% county TAT every county charges. The Act's planned extension of the tax to cruise fares is currently on hold under a federal appeals-court injunction, so cruise passengers are not being charged it at the time of writing.
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020 (Honolulu and Kailua-Kona stations); NOAA State Climate Summary for Hawaii: statesummaries.ncics.org
- National Weather Service, Honolulu Forecast Office, weather and surf FAQ: weather.gov/hfo
- Central Pacific Hurricane Center / National Hurricane Center: nhc.noaa.gov
- Hawaii DBEDT, monthly preliminary visitor statistics releases, 2025 (daily visitor census and arrivals): dbedt.hawaii.gov and governor.hawaii.gov
- NOAA, Hawaiian Islands Humpback Whale National Marine Sanctuary: hawaiihumpbackwhale.noaa.gov
- County of Maui, Maui Recovers (Lahaina access and rebuilding): mauirecovers.org; Hawaii DLNR News Release NR25-138 (Lahaina Harbor, December 2025); Hawaii Tourism Authority statements on West Maui reopening
- National Park Service: Haleakala National Park sunrise reservations; Pearl Harbor National Memorial, USS Arizona Memorial programs: nps.gov
- Hawaii DLNR Division of State Parks: Diamond Head State Monument and Haena State Park pages: dlnr.hawaii.gov
- Office of the Governor, Act 96 Green Fee release (27 May 2025); Hawaii Department of Taxation Announcement 2025-03
- Merrie Monarch Festival: merriemonarch.com; Honolulu Marathon: honolulumarathon.org; Aloha Festivals: alohafestivals.com
