What is the best month to visit Honolulu?

Warm all year

Honolulu has a warm, dry climate for the tropics, drier than many visitors expect, because the mountains behind the city shelter it from much of the rain that falls on the windward coast. Average highs run from the low eighties to about ninety degrees Fahrenheit, average lows from the mid-sixties to the mid-seventies, and only a few dozen days a year reach ninety or more; the record high is just ninety-five degrees. The city averages about two hundred seventy-eight sunny days a year.

The ocean follows the same pattern, staying warm all year, from about seventy-six degrees in March, its coolest month, to about eighty in September, its warmest. Swimming and beach time are good any month at Waikīkī or anywhere along the south shore, so a visitor need not plan a trip around water temperature.

The real choice is about rain, wind, surf and storms, and about the city's own calendar of festivals and royal observances. The sections below set out the two broad seasons, the effect of the mountains on weather from one side of the island to the other, and the dates worth building a trip around.

Summer: dry and breezy

From about May to September, the trade winds blow on most days, eighty to ninety-five percent of them in these months. They cool the city, keep the air clear, and push clouds against the mountains, where they drop their rain on the windward side and the ridge, leaving the south shore dry. This is the sunniest, most dependable stretch of Honolulu's year.

Summer is also when swells generated by storms far to the south can reach the south shore, bringing larger surf to Waikīkī and Ala Moana. Lifeguards post high surf warnings when such swells arrive; check conditions with them, or read the ocean page, before swimming on a day with a noticeable shorebreak.

In the valleys behind the city, streams tend to run lower through these summer months. Mānoa Falls, a popular walk reached from the valley, often carries less water in summer than in the wetter months, though the trail can still be slick underfoot; ask locally about current conditions before setting out.

Winter: greener and wetter

From October to early April the trade winds weaken and most of the city's rain falls, though the annual total is modest, about sixteen inches. Summer and winter have a similar number of rainy days, but winter showers tend to be heavier, and the hills behind the city turn a deeper green through these months.

Rainbows become a common sight over Mānoa, and from mid-September to late March the sun sets directly into the sea in view of Waikīkī Beach. Winter also brings Kona storms, cyclones arriving from the west against the usual wind; the islands see two or three a year, with heavy rain, flash floods and strong wind for several days.

On Oʻahu's North Shore, winter swells generated far out in the North Pacific send in the huge surf the coast is known for, while its waters run calm for much of the summer. A visit there counts among the island's classic day trips, best planned with the season's surf in mind.

Two sides of the mountains

Hawaiʻi's weather depends as much on where a visitor stands as on the month. The islands draw most of their rain from trade winds hitting the north and east flanks, the windward side, where moist air rises over the mountains and drops its load; the leeward south and west coasts, where Honolulu lies, stay much drier.

Windward areas tend to cloud over more in summer, when the trade winds are strongest, and leeward areas more in winter, when storm fronts pass through more often. That is why a gray morning in the city can turn into a bright one a short drive away, and why the reverse happens just as often.

Within the city itself, the valleys behind the shore run wetter than the coast: Mānoa gets rain on all but a few days even in the dry season, while its surrounding ridges stay largely dry. Mānoa's stream has flooded more than once, badly in 2004, a reminder to take forecasts for the valley seriously even on a sunny beach day.

Extremes and hurricane season

Honolulu's weather records show how narrow its range runs. The highest temperature ever recorded, ninety-five degrees, was reached only twice, in 1994 and 2019; the lowest, fifty-two degrees, in 1902 and 1969. Lows in the upper fifties occur once or twice a year, and tornadoes and waterspouts off the coast are both rare. Pack for warm days and mild evenings in every season, with a light layer for wind and for cooler mountain air.

The central Pacific hurricane season runs from the first of June to the end of November, with its peak in August and September. Tropical storms form in or move into the region three or four times in an average year, but most are weak and fade as they near the islands; a direct hit is rare, and the last hurricane to strike near Honolulu was Iniki, in 1992.

If a storm does threaten during a stay, follow the instructions of local officials and the hotel, and keep a little water and food on hand. Flights and beach access can be affected for a day or two around such a storm, so travel insurance that covers storm disruption is worth considering for a trip booked in late summer.

The calendar

The city keeps its own calendar of days worth planning a visit around. Lei Day, on the first of May, has been a holiday since 1929; each island claims a distinct lei of its own, and the celebration, first held in courts and town halls, now takes place at Kapiʻolani Park.

King Kamehameha Day, on the eleventh of June, was first proclaimed by Kamehameha V in 1871. The statue in front of Aliʻiōlani Hale is draped in long lei for the day, and a floral parade runs from ʻIolani Palace past the harbor, through Kakaʻako and Ala Moana, ending at Kapiʻolani Park.

The Aloha Festivals, a statewide series of free events built around the Makahiki, the start of the Hawaiian year, add a royal court, a Waikīkī street party and another floral parade; check the festival's dates for the year of travel. At ʻIolani Palace, the birthdays of King Kalākaua, on the sixteenth of November, and Queen Kapiʻolani, on the twenty-eighth of December, are marked with ceremonies.

So, when to come

For the most reliable weather, come between May and September, and accept the summer heat and occasional bigger south shore surf. For greener hills, quieter beaches and a sunset that drops into the sea, come between October and April, and accept the chance of a heavier shower or a Kona storm passing through.

For the royal days, time a visit to the eleventh of June, when the parade runs from ʻIolani Palace to Kapiʻolani Park, or to the first of May for Lei Day at the same park. Box jellyfish follow a schedule of their own, tending to appear about nine to ten days after each full moon regardless of season, so it is worth checking the beach signs or asking a lifeguard that day.

Whenever the dates fall, a visitor should still book the handful of things in Honolulu that need advance planning, from certain trails to certain guided tours, well ahead of arrival and not on the day; the booking ahead page sets out what those are and how far in advance to act.