Quick Answer
April–May and September–October are Jeju’s best travel windows. Spring brings the island’s famous canola flower season and cherry blossoms; autumn delivers crisp weather and Hallasan’s foliage at its most colourful. Both seasons avoid the monsoon rains of summer and offer the island in its most photogenic form.
Summer (July–August) is peak season for domestic Korean tourism but brings heat, humidity, and typhoon risk. Winter is quiet and genuinely mild compared to mainland Korea, with lower prices and occasional Hallasan snow.
Jeju Weather at a Glance
| Month | Avg High (°C) | Avg Low (°C) | Rainfall (mm) | Season Notes |
|---|---|---|---|---|
| January | 9 | 3 | 75 | Quiet, mild winters — tangerine season |
| February | 10 | 4 | 70 | Canola flowers begin in sheltered spots |
| March | 13 | 7 | 90 | Early canola fields, cherry blossom preview |
| April | 18 | 12 | 95 | Peak spring — canola + cherry blossoms |
| May | 22 | 17 | 100 | Green hills, warm but not humid |
| June | 26 | 21 | 170 | Monsoon begins, increasing humidity |
| July | 30 | 25 | 230 | Peak domestic season, typhoon risk |
| August | 31 | 26 | 220 | Hottest month, busy beaches, typhoon risk |
| September | 27 | 22 | 175 | Typhoon tail end, quietening down |
| October | 21 | 15 | 75 | Best autumn weather, clear skies |
| November | 16 | 9 | 80 | Autumn foliage, tangerine harvest |
| December | 11 | 5 | 65 | Quiet season, hallabong citrus in markets |
Temperatures approximate averages for Jeju City; Hallasan summit runs 10–15°C cooler year-round.
Spring: Late March to May
Spring is the most popular season on Jeju for good reason. The island transforms from February through April as wave after wave of flowers bloom across the volcanic landscape.
Canola flower fields (late February to mid-April): Sanbangsan in the south-west blooms first, typically in late February. By mid-March the fields around Seongsan and the north-east are in full colour. The Noksan-ro canola road near Pyoseon is one of the most photographed stretches in South Korea — arrive at dawn to beat the crowds.
Cherry blossoms (late March to early April): Jeju’s blossoms open roughly one week before Seoul’s. The entrance road to Jeju Airport, Gwandeok-ro in Jeju City, and Sanbangsan’s foothills are reliable bloom spots. Peak bloom typically lasts five to eight days before petals fall.
Weather: April temperatures range 12–18°C with occasional showers. May warms to 17–22°C and stays pleasant before the June humidity arrives.
Crowds: April weekends bring Korean domestic tourists specifically for the flowers. Book accommodation 4–6 weeks ahead for mid-April. Weekdays are noticeably calmer.
Events to note: The Jeju Fire Festival (Jeju Deulbul Festival) usually falls in late February or early March — a traditional field-burning ceremony on Saebyeol Oreum, a parasitic volcanic cone north of Jeju City. Exact dates vary annually; check visitjeju.net for the current year’s schedule.
Summer: June to August
Summer is Jeju’s busiest domestic season. Korean families descend on the island through July and August, beaches fill by mid-morning, and accommodation prices reach their peak.
June is transitional: the monsoon (jangma) begins mid-month with heavier rain and rising humidity, but the first two weeks can be warm and pleasant. It is the last affordable month before peak pricing.
July–August: Temperatures routinely hit 30–31°C with high humidity. The island’s beaches — Hamdeok, Iho, Woljeong — are at their most lively. Water sports operators are fully open: jet ski hire at Hamdeok Beach runs approximately KRW 50,000 (USD 37) for 20 minutes as of 2026.
Typhoon risk: Jeju sits directly on the primary typhoon track. Most years see one or two typhoons affect the island’s weather between July and September, though direct landfalls are less common than peripheral effects. Travel insurance covering typhoon disruption is strongly recommended for this window.
Hiking: Hallasan summit trails may be closed or conditions difficult during typhoon warnings. The lower trails (Eorimok, Yeongsil) are generally accessible.
Autumn: September to November
Autumn is the other peak quality window. The typhoon risk drops after mid-September, the crowds thin as schools return to the mainland, and the light takes on the golden quality that defines the season.
October is the standout month. Average highs reach 20–21°C with low rainfall (approximately 75mm). Hallasan’s slopes show colour change from mid-October through early November — beech and maple trees along the Seongpanak trail turn yellow and orange. Summit visibility is at its best: clear days offer views across the strait to the mainland.
Tangerine (gamgyul) season: Jeju’s citrus harvest begins in November. Roadside stalls and picking farms open across the island from late October. Gamgyul picking is a popular activity — farms charge approximately KRW 10,000–15,000 (USD 7–11) per person for the experience including takeaway.
Crowds: October weekends are busy around national holidays (Chuseok affects late September or early October depending on the lunar calendar — check the year’s exact dates). Book transport and accommodation well ahead if your trip coincides with Chuseok.
Winter: December to February
Winter is Jeju’s quiet season and significantly milder than the mainland. Jeju City’s average low in January is approximately 3°C — compared to Seoul’s -6°C — making it a viable winter escape for Korean domestic travellers.
Hallasan snow: The summit reliably receives snow from December through February and can hold snow patches into March. The upper sections of the Seongpanak and Gwaneumsa trails become ice-covered, requiring microspikes or crampons (available to hire near the trailheads for approximately KRW 5,000 as of 2026). Permit availability is typically better in winter than spring and autumn.
Prices: Accommodation drops 20–40% below spring peak rates. Budget pensions in Seogwipo can be found from KRW 40,000–60,000 (USD 29–44) per night in January. Flights from Gimpo to Jeju Airport (CJU) see similar reductions.
Citrus: Hallabong — Jeju’s premium mandarin variety — is in peak season January through March. Street stalls and convenience stores sell them by the bag. Dongmun Traditional Market in Jeju City is the best place to buy directly from island growers.
Practical Booking Notes
Ferry versus flight: Domestic flights from Seoul Gimpo (GMP) to Jeju (CJU) take approximately 1 hour and are the primary route. The Gimpo–Jeju service is one of the world’s busiest flight routes by passenger count. Book at least 2–3 weeks ahead for spring and summer travel; 1 week is usually sufficient in winter. Ferry services run from Mokpo (4.5 hours), Wando, and Busan (13 hours) — practical if bringing a vehicle.
Rental car timing: Book your rental car simultaneously with flights, especially for April and October. Demand regularly outstrips supply on peak weekends. Major rental companies at Jeju Airport include Lotte Rent-a-Car, SK Rent-a-Car, and KT Kumho. An international driving permit is required by most agencies.
Hallasan reservations: The summit trails (Seongpanak and Gwaneumsa) require advance booking via hallasan.go.kr. During April and October peak periods, slots fill within minutes of opening — set a calendar reminder for the booking release date.