South Korea
Jeju in September
🍂 AutumnPleasant, a little humid and often rainy. Watch for tropical cyclone risk.
🎒 Pack: compact umbrella or rain jacket
Why September scores 8.2What goes into the score
How it works- Weather comfort7.5
- ✓Comfortable temperatures (25.2°C highs / 23.4°C lows)
- !Humid (dew point 20.6°C)
- !Wet: ~210 mm rain, ~6 heavy-rain days
- Air quality9.3
- ✓Good (within WHO guideline) (PM2.5 ~9 µg/m³)
- Seasonal hazards8.5
- !Tropical cyclone: Peak of the Western Pacific typhoon season
- Safety baseline9.0
- ·Normal precautions
| Sep | Oct | |
|---|---|---|
| Score | 8.2 Very good | 9.1 Excellent |
| Season | 🍂 Autumn | 🍂 Autumn |
| High / low | 25° / 23° | 21° / 19° |
| Rain | 210 mm | 107 mm |
| Humidity | dew pt 21° | dew pt 15° |
| PM2.5 | 9 µg/m³ | 9 µg/m³ |
Typical-month data: NASA POWER (MERRA-2 reanalysis) 2015–2024 (modelled, not a forecast).
Holidays & crowdsSeptember 2027
Long weekendThere's at least one long weekend. Domestic travel picks up and popular spots get busier over those days.
- Chuseok 14–16 Sep · 3 days off in a row
National holidays only; regional holidays and school breaks aren't included. Source: holidays (open-source public-holiday calendar).
Nature calendarBlossoms, leaves & seasons in Jeju
- Cherry blossomTypical datesFirst blooms ~24 Mar, full bloom about a week later
Typical first-bloom date at the Seogwipo (Jeju) weather-station tree (KMA 1991–2020 normal). In 2025 the first blooms came on 27 Mar; recent years have mostly been earlier than the normal. Weather i and KMA publish the next year's outlook in late February.
Source: Weather i 2026 cherry blossom outlook (KMA normals and 2025 dates)
Explore JejuEvents, sights, food & souvenirs
Check event dates locallyA volcanic island off South Korea's southern coast, known for Hallasan mountain, coastal trails, beaches and lava formations.
No major events on our calendar for September.
Coming up later
Cherry blossom seasonDate variesUsually late March to early April
Jeju's blossoms are among the earliest in Korea.
Why go: Blossom timing depends on the weather each year.
Where: Jeonnong-ro in Jeju City and around the island
Canola flower seasonDate variesUsually March to April
Bright yellow canola fields bloom across the east and south of the island.
Why go: Some fields charge a small entry fee for photography.
Where: Seongsan area, Gasi-ri and roadsides around the island
Hallasangreat in Sep
South Korea's highest mountain, a dormant volcano at the centre of the island.
💡 Summit trails require an advance online reservation and have early cut-off times for starting the climb.
Seongsan Ilchulbong
A tuff cone crater on the east coast, a popular sunrise viewpoint.
💡 Arrive early for sunrise; the climb takes about 20-30 minutes.
Manjanggul Lava Tube
One of the world's longer lava tubes, with a section open to visitors.
💡 It stays cool inside year-round, so bring a layer.
Jeju Olle Trail
A network of numbered walking routes that circle the island's coast.
Haenyeo women divers
Jeju's female free-divers, recognised by UNESCO, can sometimes be seen at work along the coast.
💡 The Haenyeo Museum in Gujwa explains their history.
Cheonjiyeon and Jeongbang waterfalls
Waterfalls near Seogwipo; Jeongbang falls directly into the sea.
Black pork (heuk dwaeji)
Grilled pork from Jeju's black-haired pigs, the island's signature meal.
💡 Black pork street in Jeju City and barbecue restaurants island-wide
Abalone porridge (jeonbokjuk)
Rice porridge cooked with abalone, often greenish from the innards.
💡 Coastal restaurants, especially near diving villages
Galchi (hairtail fish)
Silvery cutlassfish, served grilled or in a spicy stew.
💡 Seafood restaurants and Dongmun Market
Gogi-guksu
Noodle soup in pork broth topped with sliced pork.
💡 Noodle street near Jeju City centre
Hallabong
A large, sweet citrus fruit grown on the island.
💡 Markets and roadside stalls, in season late winter to spring
Dol hareubang figures
Miniatures of the island's carved basalt 'grandfather' statues.
💡 Souvenir shops and markets
Citrus products
Hallabong and tangerine chocolates, juices and snacks.
💡 Markets, airport and souvenir shops
Jeju green tea
Tea and tea sweets from the island's plantations.
💡 Tea museum shops and plantations around Seogwipo