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Best time to visit Ulsan

The best time to visit Ulsan is April–May and October, judged on twenty years of weather records and the events worth going for.

Ulsan, Ulsan, South Korea

°C

mm

−10°0°10°20°30°40°
0100200300400500
  • Average daily high and low
  • Precipitation
  • Good month
  • Best month
  • Made good or best by an event
Average daily high and low temperature, average precipitation and each month's verdict
MonthAverage daily highAverage daily lowPrecipitationVerdict
January7 °C / 45 °F-1.5 °C / 29 °F27 mm / 1.1 inneither best nor good
February9.1 °C / 48 °F0.2 °C / 32 °F45 mm / 1.8 inneither best nor good
March13.8 °C / 57 °F4.2 °C / 40 °F72 mm / 2.8 ingood month
April18.5 °C / 65 °F8.7 °C / 48 °F89 mm / 3.5 inbest month
May23 °C / 73 °F13.8 °C / 57 °F97 mm / 3.8 inbest month
June25.4 °C / 78 °F18.6 °C / 65 °F130 mm / 5.1 ingood month
July28.6 °C / 83 °F23.3 °C / 74 °F212 mm / 8.3 inneither best nor good
August29.8 °C / 86 °F24.4 °C / 76 °F187 mm / 7.4 inneither best nor good
September25.7 °C / 78 °F19.9 °C / 68 °F190 mm / 7.5 ingood month
October21.3 °C / 70 °F13.7 °C / 57 °F93 mm / 3.7 inbest month
November15.5 °C / 60 °F6.8 °C / 44 °F46 mm / 1.8 ingood month
December8.6 °C / 47 °F0.1 °C / 32 °F30 mm / 1.2 inneither best nor good
Good and best months depend on more than temperature, rain and events. How they are chosen

Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:

  • Daytime highs
  • Night-time lows
  • How warm it feels
  • Humidity
  • How much of the day is sunny
  • Hours of daylight
  • Monthly rainfall
  • How many days it rains
  • Days of heavy rain
  • Wind
  • Snowfall and days with snow
  • Major events, such as festivals

The chart shows the good and best months for exploring outdoors.

The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.

Best months by activity

Exploring outdoors

Mild days and nights, mostly dry and bright. The default for 'when should I go'.

  1. JJanuary: neither
  2. FFebruary: neither
  3. MMarch: good
  4. AApril: best
  5. MMay: best
  6. JJune: good
  7. JJuly: neither
  8. AAugust: neither
  9. SSeptember: good
  10. OOctober: best
  11. NNovember: good
  12. DDecember: neither
Best
April–May, October
Good
March, June, September, November
Why these months

  • March · good

    In its favour: share of daylight that is sunny 76%, precipitation 72 mm / 2.8 in, wet days 7.8 days, days with heavy rain 2.5 days, average daily high 13.8 °C / 57 °F, relative humidity 58%, average daily low 4.2 °C / 40 °F.

    Against: feels like (high) 10.6 °C / 51 °F.

  • April · best

    In its favour: feels like (high) 16.5 °C / 62 °F, average daily high 18.5 °C / 65 °F, share of daylight that is sunny 75%, precipitation 89 mm / 3.5 in, wet days 7.9 days, days with heavy rain 3.1 days, relative humidity 60%, average daily low 8.7 °C / 48 °F.

  • May · best

    In its favour: feels like (high) 22.7 °C / 73 °F, average daily high 23 °C / 73 °F, share of daylight that is sunny 73%, precipitation 97 mm / 3.8 in, wet days 7.3 days, days with heavy rain 3.1 days, average daily low 13.8 °C / 57 °F, relative humidity 65%.

  • June · good

    In its favour: feels like (high) 27.3 °C / 81 °F, average daily high 25.4 °C / 78 °F, share of daylight that is sunny 66%, wet days 9.9 days, average daily low 18.6 °C / 65 °F, precipitation 130 mm / 5.1 in, days with heavy rain 4 days, relative humidity 76%.

  • September · good

    In its favour: feels like (high) 27.6 °C / 82 °F, average daily high 25.7 °C / 78 °F, share of daylight that is sunny 67%, average daily low 19.9 °C / 68 °F, wet days 11.3 days.

    Against: precipitation 190 mm / 7.5 in, days with heavy rain 4.5 days, relative humidity 78%.

  • October · best

    In its favour: feels like (high) 20.4 °C / 69 °F, average daily high 21.3 °C / 70 °F, share of daylight that is sunny 76%, precipitation 93 mm / 3.7 in, wet days 6 days, days with heavy rain 2.3 days, average daily low 13.7 °C / 57 °F, relative humidity 71%.

  • November · good

    In its favour: precipitation 46 mm / 1.8 in, share of daylight that is sunny 79%, feels like (high) 12.5 °C / 55 °F, average daily high 15.5 °C / 60 °F, wet days 4.6 days, days with heavy rain 1.6 days, relative humidity 63%, average daily low 6.8 °C / 44 °F.

Beach and swimming

Hot, dry and sunny. Penalises the monsoon hard.

  1. JJanuary: neither
  2. FFebruary: neither
  3. MMarch: neither
  4. AApril: neither
  5. MMay: neither
  6. JJune: good
  7. JJuly: neither
  8. AAugust: neither
  9. SSeptember: neither
  10. OOctober: neither
  11. NNovember: neither
  12. DDecember: neither
Good
June
Why these months

  • June · good

    In its favour: average daily high 25.4 °C / 78 °F, share of daylight that is sunny 66%, feels like (high) 27.3 °C / 81 °F, average daily low 18.6 °C / 65 °F, wind (daily max) 16 km/h / 10 mph.

    Against: precipitation 130 mm / 5.1 in, days with heavy rain 4 days, wet days 9.9 days.

Hiking and trekking

Cool enough to climb in, dry enough to enjoy, long enough days.

  1. JJanuary: good
  2. FFebruary: good
  3. MMarch: best
  4. AApril: best
  5. MMay: best
  6. JJune: neither
  7. JJuly: neither
  8. AAugust: neither
  9. SSeptember: neither
  10. OOctober: best
  11. NNovember: best
  12. DDecember: good
Best
March–May, October–November
Good
December–February
Why these months

  • January · good

    In its favour: precipitation 27 mm / 1.1 in, wet days 3.8 days, days with heavy rain 0.7 days, share of daylight that is sunny 80%, wind (daily max) 19 km/h / 12 mph, daylight per day 10.1 h.

    Against: average daily high 7 °C / 45 °F, feels like (high) 2.2 °C / 36 °F, average daily low -1.5 °C / 29 °F.

  • February · good

    In its favour: precipitation 45 mm / 1.8 in, average daily high 9.1 °C / 48 °F, wet days 6 days, days with heavy rain 1.4 days, share of daylight that is sunny 79%, daylight per day 10.9 h, wind (daily max) 18 km/h / 11 mph, average daily low 0.2 °C / 32 °F.

    Against: feels like (high) 4.8 °C / 41 °F.

  • March · best

    In its favour: average daily high 13.8 °C / 57 °F, precipitation 72 mm / 2.8 in, wet days 7.8 days, average daily low 4.2 °C / 40 °F, share of daylight that is sunny 76%, daylight per day 12 h, days with heavy rain 2.5 days, feels like (high) 10.6 °C / 51 °F, wind (daily max) 19 km/h / 12 mph.

  • April · best

    In its favour: average daily high 18.5 °C / 65 °F, precipitation 89 mm / 3.5 in, wet days 7.9 days, feels like (high) 16.5 °C / 62 °F, average daily low 8.7 °C / 48 °F, share of daylight that is sunny 75%, daylight per day 13.1 h, days with heavy rain 3.1 days, wind (daily max) 19 km/h / 12 mph.

  • May · best

    In its favour: average daily high 23 °C / 73 °F, precipitation 97 mm / 3.8 in, wet days 7.3 days, average daily low 13.8 °C / 57 °F, share of daylight that is sunny 73%, daylight per day 14 h, feels like (high) 22.7 °C / 73 °F, days with heavy rain 3.1 days, wind (daily max) 18 km/h / 11 mph.

  • October · best

    In its favour: average daily high 21.3 °C / 70 °F, precipitation 93 mm / 3.7 in, wet days 6 days, days with heavy rain 2.3 days, feels like (high) 20.4 °C / 69 °F, average daily low 13.7 °C / 57 °F, share of daylight that is sunny 76%, daylight per day 11.3 h, wind (daily max) 17 km/h / 10 mph.

  • November · best

    In its favour: average daily high 15.5 °C / 60 °F, precipitation 46 mm / 1.8 in, wet days 4.6 days, days with heavy rain 1.6 days, feels like (high) 12.5 °C / 55 °F, average daily low 6.8 °C / 44 °F, share of daylight that is sunny 79%, wind (daily max) 17 km/h / 10 mph, daylight per day 10.3 h.

  • December · good

    In its favour: precipitation 30 mm / 1.2 in, wet days 3.9 days, days with heavy rain 0.9 days, average daily high 8.6 °C / 47 °F, share of daylight that is sunny 82%, wind (daily max) 19 km/h / 12 mph, average daily low 0.1 °C / 32 °F.

    Against: feels like (high) 4.2 °C / 40 °F, daylight per day 9.8 h.

An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Muju, 147 km away.

Weather averages

Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.

  JanFebMarAprMayJunJulAugSepOctNovDec
Feels like (high) 2.2 °C4.8 °C10.6 °C16.5 °C22.7 °C27.3 °C32.7 °C34.3 °C27.6 °C20.4 °C12.5 °C4.2 °C
Days with heavy rain 0.7 days1.4 days2.5 days3.1 days3.1 days4 days5.7 days5.4 days4.5 days2.3 days1.6 days0.9 days
Time rain usually falls 1 pm2 pm6 am4 am3 pm1 am8 am3 pm5 am11 am5 am7 pm
Sunshine per day 8 h8.6 h9 h9.8 h10.2 h9.6 h8.9 h9.7 h8.3 h8.6 h8.2 h8 h
Relative humidity 53%54%58%60%65%76%82%80%78%71%63%56%

Sea temperature

Averaged over a shorter period (2022–2025) than the twenty-year averages above.

  JanFebMarAprMayJunJulAugSepOctNovDec
Sea temperature 2022–202512.4 °C11.9 °C13.1 °C14.1 °C15.9 °C18.1 °C19.8 °C26.5 °C26.4 °C22.3 °C17.7 °C14 °C
Sea temperature (daily max) 2022–202512.5 °C12 °C13.3 °C14.4 °C16.2 °C18.8 °C20.7 °C27.2 °C26.7 °C22.4 °C17.9 °C14.2 °C
  • Very cold 10 °C or less
  • Cold 10 to 15 °C
  • Cool 15 to 20 °C
  • Comfortable 20 to 25 °C
  • Warm 25 to 28 °C
  • Very warm over 28 °C

The words describe how the water feels to swim in. They are ours, not an official standard.

Air quality

Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.

  JanFebMarAprMayJunJulAugSepOctNovDec
Air pollution (PM2.5) 2022–202519.2 µg/m³18.3 µg/m³23.4 µg/m³22.7 µg/m³20.7 µg/m³21.9 µg/m³13.7 µg/m³14.8 µg/m³11.9 µg/m³13.8 µg/m³17 µg/m³16 µg/m³
Air pollution (PM2.5, daily peak) 2022–202531.1 µg/m³30.2 µg/m³36.3 µg/m³34.4 µg/m³32.7 µg/m³34.1 µg/m³24 µg/m³24.2 µg/m³19.1 µg/m³21.6 µg/m³27.4 µg/m³27.5 µg/m³
  • Good 15 µg/m³ or less
  • Fair 15 to 25 µg/m³
  • Moderate 25 to 37.5 µg/m³
  • Poor 37.5 to 50 µg/m³
  • Very poor 50 to 75 µg/m³
  • Extremely poor over 75 µg/m³

Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.

World Heritage sites nearby

UNESCO World Heritage sites within 25 km, nearest first.

  • Petroglyphs along the Bangucheon Stream

    15 km away

Other places in South Korea

Compare places month by month on the travel calendar

Monthly averages over 2006–2025, unless stated otherwise.

Weather data by Open-Meteo.com (CC-BY 4.0), generated using Copernicus Climate Change Service information (ERA5). City data from GeoNames (CC-BY 4.0). Air quality from the Copernicus Atmosphere Monitoring Service (CAMS) and sea temperature from Météo-France / Copernicus Marine, both via Open-Meteo.com. Coastline from Natural Earth. Ski areas from OpenSkiMap.org, © OpenStreetMap contributors (ODbL) and Skimap.org. World Heritage sites from Wikidata (CC0), from the World Heritage List © UNESCO World Heritage Centre. Readership from Wikimedia pageview data (CC0). Destination classification derived from English Wikivoyage, © Wikivoyage contributors (CC BY-SA 4.0).