Ulsan weather by month & the best time to visit
South Korea · coastal city break · humid subtropical climate
The best time to visit Ulsan is October — its sunniest month (Sunshine Score 76/100), with May close behind. Ulsan averages about 1,954 hours of sunshine a year. Daytime highs around 20°C / 68°F and roughly 76 mm of rain in October.
When is the best time to visit Ulsan?
For sunshine, the best time to visit Ulsan is October, then May. The dullest month is January (0/100, 42 mm of rain). The full month-by-month picture is in the table below.
How sunny is Ulsan?
Ulsan gets a moderate 1,954 hours of sunshine a year. 76 Sunshine Score points separate October (76) from January (0), so the month you pick matters. It ranks #8 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 August, carries about 46% of the annual 1,323 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 6° / 43°F | 0° / 32°F | 42 mm | 2 | 13° / 55°F |
| February | 0 | 8° / 46°F | 2° / 36°F | 53 mm | 3 | 13° / 55°F |
| March | 25 | 12° / 54°F | 5° / 41°F | 74 mm | 4 | 13° / 55°F |
| April | 52 | 17° / 63°F | 10° / 50°F | 112 mm | 5 | 15° / 59°F |
| May | 68 | 21° / 70°F | 14° / 57°F | 118 mm | 6 | 17° / 63°F |
| June | 63 | 24° / 75°F | 19° / 66°F | 150 mm | 6 | 20° / 68°F |
| July | 63 | 27° / 81°F | 23° / 73°F | 240 mm | 6 | 20° / 68°F |
| August | 63 | 28° / 82°F | 24° / 75°F | 194 mm | 7 | 28° / 82°F |
| September | 63 | 25° / 77°F | 21° / 70°F | 168 mm | 5 | 28° / 82°F |
| October | 76 | 20° / 68°F | 15° / 59°F | 76 mm | 4 | 23° / 73°F |
| November | 47 | 15° / 59°F | 9° / 48°F | 54 mm | 2 | 19° / 66°F |
| December | 0 | 8° / 46°F | 2° / 36°F | 42 mm | 2 | 14° / 57°F |
Sea temperature in Ulsan by month
The sea off Ulsan is warmest in August at around 28°C / 82°F, and coolest in January at 13°C / 55°F. The water sits at a comfortable 21°C or warmer roughly 3 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Ulsan compares month by month: Ulsan vs Busan · Ulsan vs Daegu · Ulsan vs Yeosu · all comparisons
Ulsan: questions and answers
What kind of destination is Ulsan?
Ulsan is a coastal city break in South Korea with a humid subtropical climate — the sea reaches 28°C at its warmest and is swimmable (21°C+) about 3 months a year.
How many hours of sunshine does Ulsan get a year?
Ulsan gets about 1,954 hours of sunshine a year, at its best around October.
When is the best time to visit Ulsan?
The sunniest time to visit Ulsan is October, when the Sunshine Score peaks at 76/100 (with May close behind). Expect daytime highs around 20°C / 68°F.
What is the least sunny month in Ulsan?
January is the least sunny month in Ulsan, scoring 0/100 with about 42 mm of rain.
What is the sea temperature in Ulsan?
The sea in Ulsan ranges from about 13°C (January) to 28°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Ulsan?
The typical midday UV index in Ulsan peaks around 7 (high) in August, 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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