The Best Time to Visit Jeju Island

These figures come from the Korea Meteorological Administration's 1991-2020 climate normals for the Jeju City station, the same official baseline Korean forecasters use. Celsius first, Fahrenheit in brackets.

Annual rainfall across the year averages about 1,452 mm, and by these normals August stands alone as both the hottest month, at an average high of 30.1°C (86.2°F), and the wettest, at 272.3 mm. November is the driest month of the year. Seogwipo, on the island's south side, runs a shade milder in winter and generally wetter than Jeju City across the year, though we don't have a separate station table for it here.

Source: Korea Meteorological Administration 1991-2020 normals, at an exchange rate of roughly ₩1,415 to the US dollar checked in August 2026 for any prices quoted on this page (Last verified: August 2026); check the current forecast close to your travel dates rather than relying on a seasonal average alone.

Zooming out from the twelve-month table, here is how the four seasons compare at a glance before the detail below.

Spring (March to May): Bloom and Mild Air

This is the window most first-time visitors picture when they imagine Jeju: cherry blossom opening in late March and peaking in the first half of April, the canola fields following close behind, and average highs climbing comfortably from 13.3°C (55.9°F) in March to 22.1°C (71.8°F) by May. Rainfall stays moderate through the season rather than heavy. The trade-off is that bloom timing moves with the winter each year and is only announced with real confidence a few weeks ahead, so book flexibly around the general window rather than a single guaranteed date.

Summer (June to August): Heat, Green and the Wet Middle

Summer brings the warmest sea temperatures of the year, peaking around 26 to 27°C in mid-August, and the island turns lush and green. It also brings the jangma rainy stretch in late June into July and the start of typhoon season, plus August standing as the single hottest and wettest month on the KMA table. I still guide plenty of happy summer visitors, particularly around the east Jeju UNESCO day tour, but I tell them honestly to build a spare morning into the schedule rather than book every single day back to back.

Autumn (September to November): Clearing Skies

September still carries real typhoon risk and stays warm and rainy, but by October the air clears sharply, average highs settle at a comfortable 21.6°C (70.9°F), and rainfall drops to roughly a third of August's total. This is the other window I recommend without hesitation. November turns cooler and is the driest month on record, with the tangerine harvest running through it, a genuinely pleasant, quieter stretch for visitors who don't mind a light jacket.

Winter (December to February): Cold, Quiet, Clear

Winter is Jeju's off-season, with average highs from 8.6°C (47.5°F) in January up to 9.9°C (49.8°F) in February, and it's genuinely cold enough for occasional snow on Hallasan's upper slopes; a winter summit attempt needs real planning, covered on hiking Hallasan. Rainfall is comparatively low through the whole season, and the bus network on getting around Jeju without a car runs its normal schedule year-round, winter included. It's my personal favorite time to guide a quiet UNESCO day, precisely because the coastal sights are near-empty, but it is not the season for a beach trip or a summit hike without real cold-weather gear.

Jangma, Korea's rainy season, has a Korea Meteorological Administration 1991-2020 normal window of 19 June to 20 July for Jeju specifically. Inside that stretch you should expect genuinely wet, humid days more often than not. What I want to be clear about: the agency does not forecast the exact jangma dates for a future year in advance; any specific start or end date you see quoted online for a year that hasn't happened yet is someone's projection, not an official forecast.

Plan around the normal window, then check the live forecast as your dates approach.

Typhoon season runs July to October, and roughly three typhoons a year affect the Korean Peninsula on the agency's long-run average, with Jeju sitting first in their path and taking warnings the mainland doesn't. In practice, the thing that actually derails most visitors' Jeju trips isn't the weather on the ground once you've landed, it's a cancelled inbound flight or ferry before a storm arrives. I never promise a refund policy on an operator's behalf here; tours cancel for weather when conditions require it, and the cancellation terms shown at checkout are the ones that apply.

If a storm does clip your dates, the east Jeju UNESCO day tour and the west and south Jeju day tour both give you a full alternate day to shift to rather than losing the trip entirely.

Jeju blossoms earlier than anywhere else in Korea, typically opening in late March and peaking in the first half of April, which is why spring visitors often plan their whole trip around a narrow window. Canola, known locally as yuchae, overlaps with the tail of cherry blossom season in early April; the Seogwipo Canola Flower Festival ran 4-5 April in 2026, though the exact peak bloom for a given year is only confirmed a few weeks out, so treat any specific date as a target rather than a guarantee and check closer to your trip.

Tangerines run the opposite calendar: the harvest and the sweetest fruit come through November into January, which makes late autumn and early winter Jeju's quieter, citrus-scented season rather than its floral one. If a garden or market visit built around fresh hallabong tangerines matters to your trip, that's the window to target, not spring. I get asked constantly whether it's possible to catch both blossom and a summer beach day on one trip, and the honest answer is no, not on the same visit; the two seasons sit months apart on the calendar, so pick the one that matters more to you and plan the trip around it rather than trying to split the difference.

One more seasonal note worth knowing: sea temperature around Jeju peaks at roughly 26 to 27°C in mid-August, dropping to around 22°C by autumn, which is why the official municipal swimming season at the main beaches runs roughly 24 June to 31 August. Outside that window the water is swimmable for the determined, but the beaches themselves quiet down noticeably once the official season closes, which some visitors actually prefer if a crowded beach isn't the point of their trip.

Late April into May, and October, are where I send most first-time visitors, in that order depending on whether bloom season or clear autumn air matters more to your trip. If your dates are already fixed for a month outside those two windows, that's genuinely fine; every season here has a real case, from winter's quiet coastline to summer's warm sea, as long as you go in with honest expectations about the rain and, if you're traveling July through October, some flexibility around your flights.