Month guide · Jeju · South Korea
Jeju in September
What September is really like in Jeju: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Quick answer
September is a shoulder-season month. Expect average highs of 26°C (79°F), lows of 21°C (70°F), about 11 rainy days and roughly 12.3 hours of daylight. Still warm enough to swim early in the month, and quieter once school holidays end, but this is the main typhoon month. Chuseok can bring a busy few days.
Key facts
- Average high / low
- 26°C (79°F) / 21°C (70°F)
- Rainy days
- About 11
- Daylight
- About 12.3 hours
- Sea temperature
- 26°C (79°F)
- Crowds
- Moderate
- Hotel prices
- Average
Weather in September
September is the 3rd-warmest month in Jeju: days average 26°C (79°F) against a yearly average high of 19°C (66°F), and nights fall to about 21°C (70°F). Rain falls on roughly 11 of its 30 days. Compared with August (30°C (86°F)), September is cooler; by October highs drop to around 22°C (72°F).
- Sunrise (15 September)
- About 06:17
- Sunset (15 September)
- About 18:41
- Daylight
- About 12.3 hours
- Sea
- 26°C (79°F)
Autumn (September–November). Warm sea in September, clear skies and silver grass in October, and the tangerine harvest in November; typhoons are possible early on.
Crowds and prices
On a 1–5 scale, September rates 3 for crowds (the peak is July at 5) and 3 for hotel prices (highest in July). Prices sit in the middle of the year's range.
Events in September
- Chuseok harvest holiday — busy domestic travel (September or early October)
Dates move from year to year. Check the organiser’s site before booking travel around an event.
What to do in September
With frequent rain, plan around indoor sights and keep outdoor time flexible.
Historic site · Jeju City
Jeju 4.3 Peace Park
Allow time for the exhibition hall, which is clearly laid out with English panels, and visit before rather than after a beach day.
- Time needed
- 1.5 hours
- Cost
- Free
- History
- Free
- Rainy day
Museum · Andeok
O'sulloc Tea Museum and Seogwang tea fields
Korea's best-known tea brand runs a free museum and café beside its Seogwang green-tea plantation, where rows of tea bushes stretch towards Sanbangsan.
- Time needed
- 1 hour
- Cost
- Free
- Free
- Food
- Rainy day
- Photo spot
Nature · Central Jeju
Hallasan National Park
If you are not fit for a 9-hour summit day, take the Yeongsil trail: about 3–4 hours return with the best rock-pinnacle views on the mountain.
- Time needed
- Full day (summit); 3–4 hours (Yeongsil)
- Cost
- Free
- Iconic
- Outdoors
- Active
- Nature
- Views
- Free
Nature · Seongsan
Seongsan Ilchulbong (Sunrise Peak)
This tuff cone, formed by an underwater eruption about 5,000 years ago, rises roughly 180 m from the sea at Jeju's eastern tip.
- Time needed
- 1.5–2 hours
- Cost
- Low cost
- Iconic
- Views
- Photo spot
- Active
- Outdoors
The sea averages 26°C (79°F) — warm enough to swim. Best beaches near Jeju.
What to pack
For highs near 26°C, lows near 21°C and 11 wet days: light layers for the day and a light jacket for the evening; a packable rain jacket for showers; comfortable walking shoes.
Is September a good time to visit Jeju?
A shoulder-season month, with a notable event on the calendar. If your dates are flexible, April–May and October–November are better overall. Compare every month.
Jeju in other months
Questions travellers ask
+Is September a good time to visit Jeju?
It is a shoulder-season month. Still warm enough to swim early in the month, and quieter once school holidays end, but this is the main typhoon month. Chuseok can bring a busy few days.
+How warm is Jeju in September?
Average highs are around 26°C (79°F) and lows around 21°C (70°F).
+Does it rain a lot in Jeju in September?
Expect rain on about 11 days of the month.