Mud festival in South Korea
In July, the peaceful seaside town of Boryeong turned into a chaos of mud for 9 days. We recommend putting this festival on your bucket list.
Ulsan Weather in May
Ulsan in May sees high temperatures, with highs around 24°C (75°F) and overnight lows of 14°C (57°F). Rainfall is fairly high at around 100 mm (3.9 in) on average, so pack waterproofs just in case.
Rainfall in Ulsan in May
Typically around 9 days of rainfall are expected, averaging 100 mm (3.9 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Ulsan in May
May in Ulsan sees highs of 24°C (75°F) and lows of 14°C (57°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Ulsan in May
There are approximately 217 hours of sunshine this month, resulting in mostly clear days.If your ideal day consists of dry skies and pleasant temperatures, October typically offers the best circumstances for Ulsan.
Ulsan Temperature in May
Min Temperature
14°C (57°F)
Max Temperature
24°C (75°F)
Chance of Rain
30%
Precipitation
100 mm (3.9 in)
Rainy days
9 days
Humidity
65%
Sunshine
217 hours
Percentage Sunshine
48%
Ulsan Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Ulsan - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Ulsan typically rise from around 22°C (72°F) at the start of May to approximately 25°C (77°F) by the end. Nights are cool, with lows typically ranging from 11°C (52°F) to 15°C (59°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Ulsan in May
Browse day-by-day weather records for Ulsan spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Ulsan historical weather extremes in May
Based on weather observations in Ulsan between 1976 and 2026, these are the recorded extremes during May.
- The warmest day in May was on May 29, 1979, with a maximum of 35°C (95°F).
- The lowest daytime temperature in May was 13°C (55°F), recorded on May 2, 1990.
- The lowest overnight temperature recorded in May was 4°C (39°F) (May 6, 1976).
Best Places in South Korea in May
Find out more about the weather in South Korea and which places have the best travel conditions in this month. See all of South Korea in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Ulsan in May
For Ulsan in May, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Ulsan in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Ulsan 3-Day Forecast
More climate data for Ulsan
Temperature Rainfall Sunshine Humidity
See the full Ulsan climate overview or explore weather in South Korea.
Popular in May
Where to go in May - average daytime high across popular destinations.
Seoul
24°C (75°F) Jeonju25°C (77°F) Suwon24°C (75°F) Gyeongju25°C (77°F) Seogwipo
22°C (72°F) Incheon21°C (70°F) Busan22°C (72°F) Jeju20°C (68°F) Bucket list
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