May
Best time
21.4°C / 15.7°C
10 rain days
mild, rainy
- comfortable temperatures (avg high 21.4°C / 71°F)
- manageable rain (10 days)
- warm evenings without humidity overload
Best time to visit Jeju Island
Jeju Island, South Korea — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: May, October, April.
Best · May & October
About Jeju Island
Jeju Island is South Korea's largest island, covering an area of 1,833.2 km2 (707.8 sq mi), which is 1.83% of the total area of the country. Alongside outlying islands, it is part of Jeju Province and makes up the majority of the province.
— condensed from Wikipedia
Best months to visit
October
Best time
20.3°C / 16.1°C
10 rain days
mild, rainy
- comfortable temperatures (avg high 20.3°C / 69°F)
- manageable rain (10 days)
- warm evenings without humidity overload
April
Best time
16.9°C / 11.3°C
10 rain days
mild, rainy
- manageable rain (10 days)
June
Best time
24.3°C / 19.7°C
14 rain days
warm, rainy
- comfortable temperatures (avg high 24.3°C / 76°F)
- warm evenings without humidity overload
November
Best time
15.4°C / 10.6°C
11 rain days
cool, rainy
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OK — shoulder months
September
OK
25.1°C / 21.5°C
17 rain days
warm, very wet
- comfortable temperatures (avg high 25.1°C / 77°F)
- warm evenings without humidity overload
July
OK
28.1°C / 24.1°C
18 rain days
hot, very wet
March
OK
12.8°C / 7.2°C
10 rain days
cool, rainy
- manageable rain (10 days)
August
OK
29.1°C / 25°C
18 rain days
hot, very wet
December
OK
9.5°C / 5.3°C
14 rain days
chilly, rainy
February
OK
8.3°C / 3.6°C
10 rain days
chilly, rainy
- manageable rain (10 days)
January
OK
7.5°C / 3.3°C
11 rain days
chilly, rainy
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.
🇰🇷 Korean survival phrases
The 16 phrases that will earn you smiles, food, and help when you need it. English-speaking travellers — start with the first 4 and add the rest as needed.
Hello
안녕하세요
annyeonghaseyo
Thank you
감사합니다
gamsahamnida
Please
주세요
juseyo
Yes / No
네 / 아니요
ne / aniyo
Excuse me
실례합니다
sillyehamnida
Do you speak English?
영어 할 줄 아세요?
yeongeo hal jul aseyo
I don't understand
이해 못해요
ihae mothaeyo
How much?
얼마예요?
eolmayeyo
The bill, please
계산서 주세요
gyesanseo juseyo
Water
물
mul
Where is…?
…어디예요?
eodieyo
Bathroom
화장실
hwajangsil
Help!
도와주세요
dowajuseyo
Call the police
경찰을 불러주세요
gyeongchareul bulleojuseyo
I need a doctor
의사가 필요해요
uisaga piryohaeyo
I'm allergic to…
…에 알레르기가 있어요
e allereugiga isseoyo
Pronunciations are rough English approximations — they'll get you understood, even if your tones aren't perfect.