The Best Time to Visit Hawaii, Month by Month

Almost every answer to this question is a season. April to June, or September to November, with a warning about Christmas. That advice is not wrong exactly, and it is answering a smaller question than the one people are asking.

Hawaii's air temperature barely moves. Honolulu's monthly mean runs 73.6 to 82.2°F across the entire year, and the sea sits between 76 and 81°F every month. Nothing in the calendar makes Hawaii cold. What actually varies is rain, and rain varies by place far more violently than it varies by month.

Where beats when, and it is not close

Here is the comparison that settles it. Kona's wettest month averages 1.4 inches of rain. Hilo's driest month averages 7 inches. Hilo at its best is five times wetter than Kona at its worst, and the two towns are on the same island, about two hours apart by road.

Put differently: picking the right side of one island moves your weather more than picking the right month of the year does. In June, the wettest of the five NOAA stations below takes 43 times the rain of the driest one.

So the useful version of "when should I go" is usually "where should I stay". The leeward side of every island, meaning south and west, is the dry side. That is Waikīkī and Ko Olina on Oʻahu, Kīhei and Kāʻanapali on Maui, Poʻipū on Kauaʻi, and the whole Kona coast. If a forecast looks poor where you are staying, driving to the other side of the island is a real option rather than a consolation.

Every month at five stations

NOAA's 1991 to 2020 normals, monthly, with sea temperature alongside. Columns run driest place to wettest, which is the point of the table: read across a row and the same month is a different climate in each column.

Rainfall in inches, NOAA NCEI 1991 to 2020 monthly normals. Columns run driest station to wettest. Sea temperature from 34,802 hourly observations, 2021 to 2024 at NOAA CO-OPS station 1612340, Honolulu.

Two things are worth noticing. Kona takes less rain in its wettest month than Hilo averages in a single week. And at Honolulu, the difference between the wettest month of the year and the driest is under two inches, which is not a difference anybody feels on vacation.

The driest months are not the ones you were told

Averaged across the three leeward stations, where visitors actually stay, the driest months of the year are June, July, August, September. That is summer. The wettest are December, March, January.

This cuts against the standard shoulder-season advice, and both things can be true at once. Summer is drier and it is also busier and dearer. Spring and fall are recommended because of price and crowds rather than because of weather, and the honest way to put that is: you are trading a small amount of rain for a large amount of money.

Small is the operative word. The gap between the driest and wettest month at a leeward resort is a matter of an inch or two of monthly rainfall, spread over a handful of showers. It is not the difference between a good trip and a washout, which is how the calendar advice tends to read.

The two shoulder windows worth booking

Late April to early June. After spring break, before the summer school break. Warm, drying out, calm water and noticeably cheaper flights and hotels. The best all-round window in the year.

September to mid-November. The quietest stretch. Water is at its warmest after the long summer, hotel rates drop and the islands feel unhurried. This overlaps the tail of hurricane season, which is where travel insurance earns its money.

Winter: whales, surf and green mountains

December to March brings the humpbacks. They breed in the shallow channels around Maui, Lānaʻi and Molokaʻi, and from January to early March you can spot them from shore on a good day. It is the best wildlife experience in the islands.

Winter also means north shore swell. On Oʻahu's North Shore and Kauaʻi's north coast, beaches that are swimming pools in July turn dangerous. Swim on the south and west sides in winter and take posted warnings seriously. Visitors drown here every year.

Rain increases, usually in short heavy bursts, and the mountains turn spectacular. The waterfalls people photograph are winter waterfalls.

The weeks to avoid if you can

• December 20 to January 3. The most expensive two weeks of the year, with everything booked out. We have no rate data of our own, so take the size of the premium from whoever is quoting you rather than from us.
• Mid-March. US spring break collides with a Japanese vacation period. Busy and pricey.
• Early July. Independence Day plus peak school break.
• Merrie Monarch week in Hilo, just after Easter. Wonderful if you are going for the festival, near impossible for accommodation on Hawaiʻi Island if you are not.

Month by month, briefly

The measured version of all this, monthly rainfall for five stations and sea temperature by month, is on the weather reference page. This is the readable summary.

• January: whales arrive in numbers, big north swell, wettest month on some coasts. Prices ease after the 3rd.
• February: peak whale watching. Popular and priced for it.
• March: last reliable whale month, improving weather, and spring break spread across most of it.
• April: the turn. Dry season starts, the swell drops, and late April is excellent value.
• May: the best all-round month. Dry, warm, every coast swimmable, still shoulder pricing.
• June: calm water everywhere, and summer pricing does not start until the schools break up.
• July: peak of everything, including the bill. The best water in the state.
• August: hottest and stickiest, with a real value window in the last ten days.
• September: crowds vanish, water is warmest. Superb value.
• October: quiet, warm and cheap, and the month the wet season can arrive early.
• November: fine until Thanksgiving week, then prices jump.
• December: two different months either side of the 20th.

Where these numbers came from

Rainfall and air temperature are NOAA NCEI monthly climate normals for 1991 to 2020, at five first-order stations: Honolulu, Kahului, Līhuʻe, Kona, Hilo. Sea temperature is 34,802 hourly observations, 2021 to 2024 at NOAA CO-OPS station 1612340, Honolulu. Both were last checked on August 17, 2026.

Normals are a thirty-year average and not a forecast. They tell you what a typical June looks like at each of these five places, which is the right input for choosing where to stay and a poor one for deciding what to pack next Tuesday. For that, the weather reference page carries every month side by side and links the live forecast, and the whole dataset is downloadable as CSV.

What is not measured here is price or crowding. Nobody publishes Hawaii occupancy or rate data we can cite, so everything this page says about cost is qualitative and labelled as such.

How far ahead to book

Booking windows matter more here than in most destinations, because the supply of flights, cars and capped park entries is genuinely finite.

• Peak weeks (Christmas to New Year, mid-March, early July): flights and accommodation six to nine months out. This is not over-cautious. The good properties and the reasonable fares are gone by then.
• Shoulder months (late April to early June, September to mid-November): three to four months is comfortable, and there is usually still choice at two.
• Rental cars, always: the day your dates are fixed, on a free-cancellation rate, then re-check every couple of weeks. Car prices in Hawaii swing more than anything else in the budget.
• Capped park entries: these have their own short windows measured in days rather than months, and they are covered in the reservations guide.

See what your dates cost

Hurricane season, honestly

The Central Pacific hurricane season runs from June to November, peaking in August and September, and it overlaps two of the best-value windows in the year. That sounds alarming and mostly is not: direct hits on the islands are rare, and most seasons pass with nothing more than a distant swell and some rain.

What it does mean is that the September-to-November value is real rather than a trick, and that it comes with a small tail risk you should insure rather than avoid. Travel insurance bought at the time of booking is the entire mitigation. Bought after a storm is named, it will not cover that storm.

The practical effect of a near miss is usually a canceled boat trip and a day of heavy rain, not an evacuation, which is another argument for putting boats and helicopters early in the trip.

Vog, and when it matters

One weather factor that no month-by-month table covers: vog, the volcanic haze produced when Kīlauea is active. It drifts on the trade winds and settles mostly on the south and west of Hawaiʻi Island, with Kona the most affected town in the state.

For most visitors it reads as a hazy sky and slightly flat sunsets. For anyone with asthma or a respiratory condition it can be genuinely uncomfortable, and it is worth checking current conditions before committing to a Kona-heavy itinerary. It varies with eruption activity and wind direction rather than with season, so there is no month that reliably avoids it.

The other islands are almost never affected, and Hilo, on the windward side of the same island, usually escapes it entirely.