AI-generatedUlsan at a glance
- Best time
- Apr – Jun, Sep – Oct
- Warmest month
- Aug · 28°
- Warmest sea
- Aug · 26.3°
- Sunshine a year
- 2,250 h
- Rain a year
- 1,243 mm
- Climate
- Temperate
- Time zone
- UTC+9
- Elevation
- 10 m
Climate in Ulsan
Ulsan has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 28 °C, while January is the coolest at 6 °C. With around 2,250 hours of sunshine a year, Ulsan is sunny; April is the sunniest month with 7.1 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 16°
- Midday, 13:00: about 20°
- Afternoon, 16:00: about 20°
- Evening, 20:00: about 17°
- Night, 23:00: about 16°
06:2817:49
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 06:12–07:02 · evening 17:14–18:05
- Blue hour
- Morning 06:02–06:12 · evening 18:05–18:14
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 Ulsan in October?
In October, Ulsan is mild: daytime highs average 20 °C, and nights cool down to about 14 °C. The sea averages 22.4 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain falls on about 6 days, adding up to 79 mm. All in all, October is an excellent month for a holiday in Ulsan.
More details for October
- Daylight
- 11 h 21 min06:28 – 17:49
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 2 daysdew point 18 °C or moreAll months
- Wind
- 16 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 %55 %
- Few rainy daysweight 30 %87 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
- A jumper for the evenings
Sea temperature in Ulsan
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 21.3 – 23.5 °C
Swimming season: Jun – Oct
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Ulsan ranges from 13.7 °C in February to 26.3 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to October.
From September 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 24.8 and 27.5 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 14.8° | 14.1° | 15.5° | cold |
| FebruaryFeb | 13.7° | 13.0° | 14.6° | cold |
| MarchMar | 14.0° | 13.1° | 15.0° | cold |
| AprilApr | 15.0° | 13.8° | 15.9° | cold |
| MayMay | 16.9° | 15.6° | 17.7° | cold |
| JuneJun | 20.2° | 19.2° | 21.0° | refreshing |
| JulyJul | 23.3° | 21.8° | 24.7° | pleasant |
| AugustAug | 26.3° | 24.8° | 27.5° | warm |
| SeptemberSep | 24.9° | 23.9° | 25.9° | pleasant |
| OctoberOct | 22.4° | 21.3° | 23.5° | refreshing |
| NovemberNov | 19.7° | 19.1° | 20.5° | fresh |
| DecemberDec | 17.0° | 16.3° | 17.5° | fresh |
Sunshine hours in Ulsan
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 6.3 of 11.3 hours of daylight in Ulsan, 56 % of the day.
Sunshine hours: measured at the weather station 5 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 Ulsan
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 5 · moderateAround midday seek shade; use sunscreen, a 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 35 min
- Light brown skin
- about 45 min
- Olive skin
- about 60 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 Ulsan: 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, Ulsan has about 6 rainy days with 79 mm of rain in total.
Wind and clouds in Ulsan
How breezy and how cloudy Ulsan 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 Ulsan typically peaks at 16 km/h during the day: Beaufort 3, light breeze.
Breezy months for windsurfing and kiting
The daily breeze rarely reaches Beaufort 4 (20 km/h), so wind sports depend on single windy days.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 49 % of the sky over Ulsan: variable cloud, with about 6.3 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 Ulsan
How often the day gets hot in Ulsan (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, Ulsan has about 0 hot days, with an average daytime high of 20 °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 Ulsan
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
- Warm 20–24°
- Hot 24° and more
- muggy month (10+ muggy days)
CoolOctober: nights around 14°. A duvet at night and a jumper for the evening. Muggy on about 2 days (dew point 18 °C or more).
The coolest nights are in January (−1°), the warmest in August (24°). Tropical nights of 20 °C and more are the rule from July to September; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in June. 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 92 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 | 40 | 6° | −1° | 14.8° | 6.2 h | 4 | 30 |
| FebruaryFeb | 40 | 8° | 1° | 13.7° | 6.5 h | 5 | 40 |
| MarchMar | 56 | 12° | 4° | 14.0° | 6.5 h | 7 | 71 |
| AprilApr | 81 | 17° | 9° | 15.0° | 7.1 h | 8 | 90 |
| MayMay | 85 | 21° | 13° | 16.9° | 7.1 h | 8 | 104 |
| JuneJun | 77 | 24° | 18° | 20.2° | 5.7 h | 10 | 150 |
| JulyJul | 65 | 27° | 23° | 23.3° | 5.0 h | 14 | 213 |
| AugustAug | 58 | 28° | 24° | 26.3° | 5.7 h | 15 | 204 |
| SeptemberSep | 72 | 25° | 20° | 24.9° | 5.3 h | 11 | 187 |
| OctoberOct | 87 | 20° | 14° | 22.4° | 6.3 h | 6 | 79 |
| NovemberNov | 71 | 14° | 8° | 19.7° | 6.1 h | 5 | 50 |
| DecemberDec | 41 | 8° | 1° | 17.0° | 6.3 h | 3 | 27 |
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
35.54° N, 129.32° E · 10 m · Asia/Seoul
Best time to visit Ulsan
The best time to visit Ulsan is from April to June and from September to October. For a beach holiday with the sea above 21 °C, go in September. For sightseeing, day trips and hiking, conditions are most comfortable from April to June and from September to October. Rain is most frequent from July to August; the wettest month is July with 213 mm.
Ulsan through the seasons
How the weather changes over the seasons, with averages for each.
Ulsan in spring
Mar – May
Good
- 12–21 °C by day
- Sea 15 °C
- 7 h of sun a day
- 23 rainy days in all
Ulsan in summer
Jun – Aug
Good
- 24–28 °C by day
- Sea 23 °C
- 6 h of sun a day
- 38 rainy days in all
Ulsan in autumn
Sep – Nov
Good
- 14–25 °C by day
- Sea 22 °C
- 6 h of sun a day
- 22 rainy days in all
Ulsan in winter
Dec – Feb
Fair
- 6–8 °C by day
- Sea 15 °C
- 6 h of sun a day
- 13 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Ulsan for you.
Your best months: May – June, October
Based on the climate averages; tap a month to see its details.
Compare two months in Ulsan
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 Ulsan (score 87 and 85). In May, days are 1 °C warmer than in October. The sea is 5 °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 | 87 | 85 |
| Day high | 20° | 21° |
| Night low | 14° | 13° |
| Sea | 22.4° | 16.9° |
| Sunshine | 6.3 h | 7.1 hbetter |
| Rainy days | 6better | 8 |
| Rainfall | 79 mmbetter | 104 mm |
| Muggy days | 2 | 1better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Sep
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – Jun, Sep – Oct
15–28 °C and not too much rain
Rainy months
Jul – Aug
12 or more rainy days
Ulsan month by month
The typical weather for every month at a glance.
40January6° · Sea 15° · 6 h
In January, Ulsan is cold: daytime highs average 6 °C, and nights often drop below freezing (−1 °C). The sea averages 14.8 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is rare: about 4 days bring 30 mm in total. All in all, January is a so-so month for a holiday in Ulsan.
Ulsan in January40February8° · Sea 14° · 7 h
In February, Ulsan is cold: daytime highs average 8 °C, and nights cool down to about 1 °C. The sea averages 13.7 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 5 days, adding up to 40 mm. All in all, February is a so-so month for a holiday in Ulsan.
Ulsan in February56March12° · Sea 14° · 7 h
In March, Ulsan is cool: daytime highs average 12 °C, and nights cool down to about 4 °C. The sea averages 14.0 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 7 days, adding up to 71 mm. All in all, March is a so-so month for a holiday in Ulsan.
Ulsan in March81April17° · Sea 15° · 7 h
In April, Ulsan is mild: daytime highs average 17 °C, and nights cool down to about 9 °C. The sea averages 15.0 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 90 mm. All in all, April is an excellent month for a holiday in Ulsan.
Ulsan in April85May21° · Sea 17° · 7 h
In May, Ulsan is warm: daytime highs average 21 °C, and nights cool down to about 13 °C. The sea averages 16.9 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 104 mm. All in all, May is an excellent month for a holiday in Ulsan.
Ulsan in May77June24° · Sea 20° · 6 h
In June, Ulsan is warm: daytime highs average 24 °C, and nights cool down to about 18 °C. The sea averages 20.2 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 150 mm in total. All in all, June is a good month for a holiday in Ulsan.
Ulsan in June65July27° · Sea 23° · 5 h
In July, Ulsan is hot: daytime highs average 27 °C, and even at night it stays warm at around 23 °C. The sea averages 23.3 °C – pleasant for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 213 mm in total. The air is often humid and muggy. All in all, July is a good month for a holiday in Ulsan.
Ulsan in July58August28° · Sea 26° · 6 h
In August, Ulsan is hot: daytime highs average 28 °C, and even at night it stays warm at around 24 °C. The sea averages 26.3 °C – lovely and warm for swimming. Expect around 6 hours of sunshine a day. It rains often – on about 15 days, adding up to 204 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 Ulsan.
Ulsan in August72September25° · Sea 25° · 5 h
In September, Ulsan is warm: daytime highs average 25 °C, and even at night it stays warm at around 20 °C. The sea averages 24.9 °C – pleasant for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 187 mm in total. The air is often humid and muggy. All in all, September is a good month for a holiday in Ulsan.
Ulsan in September87October20° · Sea 22° · 6 h
In October, Ulsan is mild: daytime highs average 20 °C, and nights cool down to about 14 °C. The sea averages 22.4 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain falls on about 6 days, adding up to 79 mm. All in all, October is an excellent month for a holiday in Ulsan.
Ulsan in October71November14° · Sea 20° · 6 h
In November, Ulsan is cool: daytime highs average 14 °C, and nights cool down to about 8 °C. The sea averages 19.7 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is rare: about 5 days bring 50 mm in total. All in all, November is a good month for a holiday in Ulsan.
Ulsan in November41December8° · Sea 17° · 6 h
In December, Ulsan is cold: daytime highs average 8 °C, and nights cool down to about 1 °C. The sea averages 17.0 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is rare: about 3 days bring 27 mm in total. All in all, December is a so-so month for a holiday in Ulsan.
Ulsan in DecemberUlsan compared
Put Ulsan side by side with another destination.
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Ulsan vs. Gyeongju
In October the holiday weather in Ulsan and Gyeongju is about equally good (score 87 vs. 85). During the day it is about as warm in Gyeongju as in Ulsan.
| in October | Ulsan | Gyeongju |
|---|---|---|
| Holiday score | 87 | 85 |
| Daytime high | 20° | 20° |
| Sea | 22° | – |
| Sunshine | 6 h | 6 h |
| Rainy days | 6 | 6 |
| Best time | Apr – Jun, Sep – Oct | Apr – Jun, Oct |
Through the year
South Korea in October: the best places
In October, Ulsan ranks 6 of 9 destinations in this country.
- Busan21°22°90
- 2Daegu20°90
- 3Gwangju20°90
- 4Daejeon20°89
- 5Seoul19°88
- 6UlsanThis page20°22°87
- 7Gyeongju20°85
- 8Jeju21°22°82
Planning a trip to Ulsan
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Ulsan 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.
Ulsan has its best school-holiday weather during October half-term (score 87) and its weakest during the Christmas holidays (score 41).
- 74
Easter holidays
Mar – Apr
Good
- 16 °C by day
- Sea 15 °C
- 6.9 h of sun a day
- 8 rainy days a month
- 83
May half-term
May – Jun
Excellent
- 22 °C by day
- Sea 18 °C
- 6.8 h of sun a day
- 8 rainy days a month
Good for: Sightseeing & walks
- 60
Summer holidays
Jul – Aug
Good
- 28 °C by day
- Sea 25 °C
- 5.5 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain, Storm season
- 87
October half-term
Oct
ExcellentBest holidays
- 20 °C by day
- Sea 22 °C
- 6.3 h of sun a day
- 6 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Storm season
- 41
Christmas holidays
Dec – Jan
Fair
- 7 °C by day
- Sea 16 °C
- 6.3 h of sun a day
- 4 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 11 h 35 min
- Distance
- 9,170 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
Ulsan 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 Ulsan
When is the best time to visit Ulsan?
The best time to visit Ulsan 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 Ulsan?
The sea temperature in Ulsan ranges from 13.7 °C in February to 26.3 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to October.
Can you swim in Ulsan in October?
Yes. In October the sea averages 22.4 °C – refreshing for a swim.
What is the warmest month in Ulsan?
August is the warmest month, with average highs of 28 °C and nights around 24 °C. January is the coolest month at 6 °C.
When does it rain most in Ulsan?
Rain is most frequent from July to August; the wettest month is July with 213 mm. The driest month is December with 27 mm.
How many hours of sunshine does Ulsan get?
Ulsan gets around 2,250 hours of sunshine a year. The sunniest month is April with 7.1 hours a day; in July there are 5.0 hours a day.
What time zone is Ulsan in?
Ulsan uses the time zone Asia/Seoul, at UTC+9 all year.
How long is the flight from London to Ulsan?
A nonstop flight from London to Ulsan takes about 11 h 35 min, for a straight-line distance of about 9,170 km. Most routes need a change of planes, which adds time.
When is typhoon season in Ulsan?
Ulsan 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 Ulsan?
Ulsan has its best school-holiday weather during October half-term (score 87) and its weakest during the Christmas holidays (score 41). Holiday ratings (0–100): Easter holidays 74, May half-term 83, Summer holidays 60, October half-term 87, Christmas holidays 41.
Near Ulsan
Other destinations close by.
Places with a climate like Ulsan
Destinations whose weather through the year is closest to Ulsan's – good alternatives.