AI-generatedJeju at a glance
- Best time
- Apr – Jun, Sep – Oct
- Warmest month
- Aug · 29°
- Warmest sea
- Aug · 27.0°
- Sunshine a year
- 1,830 h
- Rain a year
- 1,545 mm
- Climate
- Temperate
- Time zone
- UTC+9
- Elevation
- 19 m
Climate in Jeju
Jeju has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 29 °C, while January is the coolest at 8 °C. With around 1,830 hours of sunshine a year, Jeju is moderately sunny; May is the sunniest month with 6.8 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Excellent
Best time to visit: April – June, September – October
October is the peak of the typhoon season
Good forSightseeing & walks
Keep in mindStorm season
A typical day in October
- Morning, 08:00: about 18°
- Midday, 13:00: about 20°
- Afternoon, 16:00: about 20°
- Evening, 20:00: about 19°
- Night, 23:00: about 18°
06:3718:02
Pleasant evenings; a light layer can help.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 06:22–07:11 · evening 17:28–18:17
- Blue hour
- Morning 06:12–06:22 · evening 18:17–18:27
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Jeju in October?
In October, Jeju is mild: daytime highs average 21 °C, and nights cool down to about 17 °C. The sea averages 22.2 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain falls on about 7 days, adding up to 87 mm. All in all, October is an excellent month for a holiday in Jeju.
More details for October
- Daylight
- 11 h 24 min06:37 – 18:02
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 4 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 49 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Seoul
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %43 %
- Few rainy daysweight 30 %79 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
Sea temperature in Jeju
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 21.5 – 23.0 °C
Swimming season: Jun – Oct
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Jeju ranges from 13.8 °C in March to 27.0 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to October.
From October to March the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 25.1 and 28.6 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 15.4° | 14.6° | 16.0° | cold |
| FebruaryFeb | 14.1° | 13.6° | 14.9° | cold |
| MarchMar | 13.8° | 13.2° | 14.6° | cold |
| AprilApr | 14.5° | 13.3° | 15.3° | cold |
| MayMay | 16.5° | 15.5° | 17.2° | cold |
| JuneJun | 20.1° | 19.1° | 20.9° | refreshing |
| JulyJul | 24.2° | 22.4° | 26.0° | pleasant |
| AugustAug | 27.0° | 25.1° | 28.6° | warm |
| SeptemberSep | 25.1° | 24.0° | 25.9° | pleasant |
| OctoberOct | 22.2° | 21.5° | 23.0° | refreshing |
| NovemberNov | 19.1° | 18.4° | 19.9° | fresh |
| DecemberDec | 16.9° | 16.2° | 17.6° | cold |
Sunshine hours in Jeju
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.6 of 11.4 hours of daylight in Jeju, 49 % of the day.
Sunshine hours: measured at the weather station 1 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Jeju
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 6 · highSeek shade around midday; sunscreen SPF 30+, hat and sunglasses.
The sun is strongest in June (UV 11).
Minutes until sunburn in October
- Very fair skin
- about 25 min
- Fair skin
- about 30 min
- Light brown skin
- about 40 min
- Olive skin
- about 55 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Jeju: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Jeju has about 7 rainy days with 87 mm of rain in total.
Wind and clouds in Jeju
How breezy and how cloudy Jeju is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Jeju typically peaks at 18 km/h during the day: Beaufort 3, light breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting: Dec – Mar.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 49 % of the sky over Jeju: variable cloud, with about 5.6 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Jeju
How often the day gets hot in Jeju (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Jeju has about 0 hot days, with an average daytime high of 21 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Jeju
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
- Warm 20–24°
- Hot 24° and more
- muggy month (10+ muggy days)
PleasantOctober: nights around 17°. Ideal for sleeping, often with the window open. Muggy on about 4 days (dew point 18 °C or more).
The coolest nights are in January (4°), the warmest in August (26°). Tropical nights of 20 °C and more are the rule from June to September; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in May and in October. Nights fall below 8 °C on average from December to March, so the room should be heated. It is muggy (dew point 18 °C or more) on about 102 days a year, mostly from June to September.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 20 | 8° | 4° | 15.4° | 2.3 h | 9 | 56 |
| FebruaryFeb | 28 | 9° | 5° | 14.1° | 3.9 h | 8 | 64 |
| MarchMar | 46 | 12° | 7° | 13.8° | 5.4 h | 9 | 94 |
| AprilApr | 70 | 16° | 11° | 14.5° | 6.5 h | 9 | 117 |
| MayMay | 82 | 20° | 15° | 16.5° | 6.8 h | 9 | 132 |
| JuneJun | 68 | 23° | 20° | 20.1° | 5.3 h | 13 | 222 |
| JulyJul | 61 | 27° | 24° | 24.2° | 6.1 h | 17 | 230 |
| AugustAug | 52 | 29° | 26° | 27.0° | 6.3 h | 17 | 214 |
| SeptemberSep | 67 | 25° | 22° | 25.1° | 5.3 h | 14 | 200 |
| OctoberOct | 82 | 21° | 17° | 22.2° | 5.6 h | 7 | 87 |
| NovemberNov | 63 | 16° | 12° | 19.1° | 4.1 h | 8 | 76 |
| DecemberDec | 32 | 10° | 6° | 16.9° | 2.6 h | 8 | 53 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
33.51° N, 126.52° E · 19 m · Asia/Seoul
Best time to visit Jeju
The best time to visit Jeju is from April to June and from September to October. The sea stays too cool for a classic beach holiday: even in August it only reaches 27.0 °C. For sightseeing, day trips and hiking, conditions are most comfortable from April to May and from October to November. Rain is most frequent from June to September; the wettest month is July with 230 mm.
Jeju through the seasons
How the weather changes over the seasons, with averages for each.
Jeju in spring
Mar – May
Good
- 12–20 °C by day
- Sea 15 °C
- 6 h of sun a day
- 28 rainy days in all
Jeju in summer
Jun – Aug
Good
- 23–29 °C by day
- Sea 24 °C
- 6 h of sun a day
- 47 rainy days in all
Jeju in autumn
Sep – Nov
Good
- 16–25 °C by day
- Sea 22 °C
- 5 h of sun a day
- 28 rainy days in all
Jeju in winter
Dec – Feb
Poor
- 8–10 °C by day
- Sea 16 °C
- 3 h of sun a day
- 25 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Jeju for you.
Your best months: May – June, October
Based on the climate averages; tap a month to see its details.
Compare two months in Jeju
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
October and May bring similar holiday weather to Jeju (score 82 and 82). In May, days are 1 °C cooler than in October. The sea is 6 °C cooler in May. May has 2 more rainy days. The sun shines an hour longer a day in May.
| Month | October | May |
|---|---|---|
| Weather score | 82 | 82 |
| Day high | 21° | 20° |
| Night low | 17° | 15° |
| Sea | 22.2° | 16.5° |
| Sunshine | 5.6 h | 6.8 hbetter |
| Rainy days | 7better | 9 |
| Rainfall | 87 mmbetter | 132 mm |
| Muggy days | 4 | 1better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – May, Oct – Nov
15–28 °C and not too much rain
Rainy months
Jun – Sep
12 or more rainy days
Jeju month by month
The typical weather for every month at a glance.
20January8° · Sea 15° · 2 h
In January, Jeju is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 15.4 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain falls on about 9 days, adding up to 56 mm. Snow falls on about 2 days. All in all, January is not an ideal month for a holiday in Jeju.
Jeju in January28February9° · Sea 14° · 4 h
In February, Jeju is cold: daytime highs average 9 °C, and nights cool down to about 5 °C. The sea averages 14.1 °C – swimming is only for the hardy. The sun is scarce, with only about 4 hours a day. Rain falls on about 8 days, adding up to 64 mm. All in all, February is not an ideal month for a holiday in Jeju.
Jeju in February46March12° · Sea 14° · 5 h
In March, Jeju is cool: daytime highs average 12 °C, and nights cool down to about 7 °C. The sea averages 13.8 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 94 mm in total. All in all, March is a so-so month for a holiday in Jeju.
Jeju in March70April16° · Sea 15° · 7 h
In April, Jeju is cool: daytime highs average 16 °C, and nights cool down to about 11 °C. The sea averages 14.5 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 9 rainy days and 117 mm in total. All in all, April is a good month for a holiday in Jeju.
Jeju in April82May20° · Sea 17° · 7 h
In May, Jeju is mild: daytime highs average 20 °C, and nights cool down to about 15 °C. The sea averages 16.5 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 9 rainy days and 132 mm in total. All in all, May is an excellent month for a holiday in Jeju.
Jeju in May68June23° · Sea 20° · 5 h
In June, Jeju is warm: daytime highs average 23 °C, and nights cool down to about 20 °C. The sea averages 20.1 °C – refreshing for a swim. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 222 mm in total. The air is often humid and muggy. All in all, June is a good month for a holiday in Jeju.
Jeju in June61July27° · Sea 24° · 6 h
In July, Jeju is hot: daytime highs average 27 °C, and even at night it stays warm at around 24 °C. The sea averages 24.2 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. It rains often – on about 17 days, adding up to 230 mm. The air is often humid and muggy. All in all, July is a good month for a holiday in Jeju.
Jeju in July52August29° · Sea 27° · 6 h
In August, Jeju is hot: daytime highs average 29 °C, and even at night it stays warm at around 26 °C. The sea averages 27.0 °C – lovely and warm for swimming. Expect around 6 hours of sunshine a day. It rains often – on about 17 days, adding up to 214 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a so-so month for a holiday in Jeju.
Jeju in August67September25° · Sea 25° · 5 h
In September, Jeju is warm: daytime highs average 25 °C, and even at night it stays warm at around 22 °C. The sea averages 25.1 °C – pleasant for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 200 mm in total. The air is often humid and muggy. All in all, September is a good month for a holiday in Jeju.
Jeju in September82October21° · Sea 22° · 6 h
In October, Jeju is mild: daytime highs average 21 °C, and nights cool down to about 17 °C. The sea averages 22.2 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain falls on about 7 days, adding up to 87 mm. All in all, October is an excellent month for a holiday in Jeju.
Jeju in October63November16° · Sea 19° · 4 h
In November, Jeju is cool: daytime highs average 16 °C, and nights cool down to about 12 °C. The sea averages 19.1 °C – bracing, so a wetsuit helps for longer swims. Expect around 4 hours of sunshine a day. Rain falls on about 8 days, adding up to 76 mm. All in all, November is a good month for a holiday in Jeju.
Jeju in November32December10° · Sea 17° · 3 h
In December, Jeju is cool: daytime highs average 10 °C, and nights cool down to about 6 °C. The sea averages 16.9 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain falls on about 8 days, adding up to 53 mm. All in all, December is not an ideal month for a holiday in Jeju.
Jeju in DecemberJeju compared
Put Jeju side by side with another destination.
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Jeju vs. Gwangju
In October Gwangju has the better holiday weather (score 90 vs. 82). During the day Gwangju is 1 °C cooler than Jeju. Gwangju gets one more hour of sunshine a day.
| in October | Jeju | Gwangju |
|---|---|---|
| Holiday score | 82 | 90 |
| Daytime high | 21° | 20° |
| Sea | 22° | – |
| Sunshine | 6 h | 7 h |
| Rainy days | 7 | 5 |
| Best time | Apr – Jun, Sep – Oct | Apr – Jun, Sep – Oct |
Through the year
South Korea in October: the best places
In October, Jeju ranks 8 of 9 destinations in this country.
- Gwangju20°90
- 2Busan21°22°90
- 3Daegu20°90
- 4Daejeon20°89
- 5Seoul19°88
- 6Ulsan20°22°87
- 7Gyeongju20°85
- 8JejuThis page21°22°82
Planning a trip to Jeju
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Jeju in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Jeju has its best school-holiday weather during October half-term (score 82) and its weakest during the Christmas holidays (score 26).
- 63
Easter holidays
Mar – Apr
Good
- 15 °C by day
- Sea 14 °C
- 6.2 h of sun a day
- 9 rainy days a month
- 79
May half-term
May – Jun
Good
- 20 °C by day
- Sea 17 °C
- 6.5 h of sun a day
- 10 rainy days a month
Good for: Sightseeing & walks
- 55
Summer holidays
Jul – Aug
Fair
- 28 °C by day
- Sea 26 °C
- 6.2 h of sun a day
- 17 rainy days a month
Keep in mind: Frequent rain, Storm season
- 82
October half-term
Oct
ExcellentBest holidays
- 21 °C by day
- Sea 22 °C
- 5.6 h of sun a day
- 7 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Storm season
- 26
Christmas holidays
Dec – Jan
Poor
- 9 °C by day
- Sea 16 °C
- 2.5 h of sun a day
- 8 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 11 h 40 min
- Distance
- 9,240 km
- Time zone
- UTC+9
- Jet lag
- About 8 days (8 h east)
Rule of thumb for flying east: for a few days before, go to bed and get up a little earlier, and get plenty of morning light at your destination.
Most routes need a change of planes, which adds time.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Storm season
Jeju lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
- January
- February
- March
- April
- May
- June: Season
- July: Season
- August: Peak
- September: Peak
- October: Peak
- November: Season
- December
Official season dates of the regional warning centres (NOAA, JMA, IMD, Météo-France, BoM); not a forecast.
Frequently asked questions about Jeju
When is the best time to visit Jeju?
The best time to visit Jeju is from April to June and from September to October. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Jeju?
The sea temperature in Jeju ranges from 13.8 °C in March to 27.0 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to October.
Can you swim in Jeju in October?
Yes. In October the sea averages 22.2 °C – refreshing for a swim.
What is the warmest month in Jeju?
August is the warmest month, with average highs of 29 °C and nights around 26 °C. January is the coolest month at 8 °C.
When does it rain most in Jeju?
Rain is most frequent from June to September; the wettest month is July with 230 mm. The driest month is December with 53 mm.
How many hours of sunshine does Jeju get?
Jeju gets around 1,830 hours of sunshine a year. The sunniest month is May with 6.8 hours a day; in January there are 2.3 hours a day.
What time zone is Jeju in?
Jeju uses the time zone Asia/Seoul, at UTC+9 all year.
How long is the flight from London to Jeju?
A nonstop flight from London to Jeju takes about 11 h 40 min, for a straight-line distance of about 9,240 km. Most routes need a change of planes, which adds time.
When is typhoon season in Jeju?
Jeju lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
Which school holidays are best for Jeju?
Jeju has its best school-holiday weather during October half-term (score 82) and its weakest during the Christmas holidays (score 26). Holiday ratings (0–100): Easter holidays 63, May half-term 79, Summer holidays 55, October half-term 82, Christmas holidays 26.
Near Jeju
Other destinations close by.
Places with a climate like Jeju
Destinations whose weather through the year is closest to Jeju's – good alternatives.