Weather in Jeju in September
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Jeju.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youSeptember in Jeju is warm, with average highs of 25.7°C and lows of 21.6°C. It is extremely wet, with heavy downpours most days, with roughly 7.6 hours of sunshine a day. It is one of the best months of the year to visit. For the complete picture, see the best time to visit Jeju — every month compared. Once you know when to go, find your Jeju packing list at 247PackingList.
Get ready for Jeju in September
Search flights to Jeju
Compare 100+ airlines for September — one search, best price.
Search Flights →Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →What to pack for Jeju in September
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Compare all months in Jeju
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 8.3°C | 119.8mm | 9/10 |
| February | 9.5°C | 82.5mm | 10/10 |
| March | 14.4°C | 129.4mm | 9/10 |
| April | 16.9°C | 115.7mm | 9/10 |
| May | 21.9°C | 161.4mm | 9/10 |
| June | 25.7°C | 199.9mm | 9/10 |
| July | 28.8°C | 271.7mm | 8/10 |
| August | 30.0°C | 259.4mm | 8/10 |
| September | 25.7°C | 482.5mm | 8/10 |
| October | 20.4°C | 54.2mm | 10/10 |
| November | 16.1°C | 102.3mm | 9/10 |
| December | 9.7°C | 93.7mm | 10/10 |
Full month-by-month guide: best time to visit Jeju →
For facts about South Korea — currency, language and dialling code — see our South Korea country guide at 247CountryInfo. Travellers also find it useful to keep a Jeju travel guide to hand. Check clothing sizes in South Korea before you shop.
Frequently Asked Questions
Is September a good time to visit Jeju?
September rates 8/10 for visiting Jeju — good time to visit. Expect average highs of 25.7°C, 482.5mm of rain across the month and about 7.6 hours of daily sunshine.
What is the temperature in Jeju in September?
In September, Jeju has average highs of 25.7°C (78.3°F) and average lows of 21.6°C (70.9°F).
Does it rain in Jeju in September?
Yes — September is one of the wetter months in Jeju, averaging 482.5mm of rain over roughly 18 rainy days. Pack for heavy showers.
What should I wear in Jeju in September?
For Jeju in September (25.7°C highs / 21.6°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts, compact travel umbrella.
More essentials for Jeju in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.