Jeju City weather by month & the best time to visit
South Korea · coastal city break · humid subtropical climate
The best time to visit Jeju City is October — its sunniest month (Sunshine Score 72/100). Jeju City averages about 1,734 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 89 mm of rain in October.
When is the best time to visit Jeju City?
For sunshine, the best time to visit Jeju City is October. The dullest month is January (7/100, 50 mm of rain). The full month-by-month picture is in the table below.
How sunny is Jeju City?
Jeju City isn't a sunny place by world standards: about 1,734 hours of sunshine a year. 65 Sunshine Score points separate October (72) from January (7), so the month you pick matters. It ranks #14 of 14 destinations in South Korea for annual sunshine, below the national median of 1,959 hours. Rain has a clear season: the wettest stretch, around July, carries about 44% of the annual 1,579 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 7 | 9° / 48°F | 6° / 43°F | 50 mm | 2 | 16° / 61°F |
| February | 13 | 10° / 50°F | 7° / 45°F | 66 mm | 3 | 15° / 59°F |
| March | 24 | 12° / 54°F | 9° / 48°F | 90 mm | 4 | 15° / 59°F |
| April | 37 | 15° / 59°F | 12° / 54°F | 137 mm | 5 | 16° / 61°F |
| May | 52 | 18° / 64°F | 15° / 59°F | 141 mm | 6 | 18° / 64°F |
| June | 61 | 22° / 72°F | 20° / 68°F | 192 mm | 6 | 22° / 72°F |
| July | 61 | 26° / 79°F | 24° / 75°F | 240 mm | 7 | 26° / 79°F |
| August | 61 | 28° / 82°F | 26° / 79°F | 261 mm | 7 | 31° / 88°F |
| September | 61 | 25° / 77°F | 23° / 73°F | 185 mm | 6 | 30° / 86°F |
| October | 72 | 21° / 70°F | 18° / 64°F | 89 mm | 5 | 26° / 79°F |
| November | 50 | 16° / 61°F | 13° / 55°F | 72 mm | 3 | 21° / 70°F |
| December | 20 | 11° / 52°F | 8° / 46°F | 56 mm | 2 | 18° / 64°F |
Sea temperature in Jeju City by month
The sea off Jeju City is warmest in August at around 31°C / 88°F, and coolest in February at 15°C / 59°F. The water sits at a comfortable 21°C or warmer roughly 6 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Jeju City compares month by month: Jeju City vs Gwangju · Jeju City vs Yeosu · Jeju City vs Gunsan · all comparisons
Jeju City: questions and answers
What kind of destination is Jeju City?
Jeju City is a coastal city break in South Korea with a humid subtropical climate — the sea reaches 31°C at its warmest and is swimmable (21°C+) about 6 months a year.
How many hours of sunshine does Jeju City get a year?
Jeju City gets about 1,734 hours of sunshine a year, at its best around October.
When is the best time to visit Jeju City?
The sunniest time to visit Jeju City is October, when the Sunshine Score peaks at 72/100. Expect daytime highs around 21°C / 70°F.
What is the least sunny month in Jeju City?
January is the least sunny month in Jeju City, scoring 7/100 with about 50 mm of rain.
What is the sea temperature in Jeju City?
The sea in Jeju City ranges from about 15°C (February) to 31°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Jeju City?
The typical midday UV index in Jeju City peaks around 7 (high) in July, easing to about 2 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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