Ulsan weather in April
Temperature, sea and sunshine in April: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in April
Excellent
Best time to visit: April – June, September – October
What is the weather like in Ulsan in April?
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.
April compared
How the weather changes from March to May. Tap a month to open it.
More details for April
- Daylight
- 13 h 3 min05:51 – 18:55
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 55 %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 %90 %
- Sunshineweight 20 %68 %
- Few rainy daysweight 30 %74 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in April
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Ulsan in April: quick answers
Is Ulsan hot in April?
No. In April, Ulsan is mild: daytime highs average 17 °C and nights drop to about 9 °C.
Can you swim in Ulsan in April?
Only if you don't mind cold water: in April the sea averages just 15.0 °C. Comfortable swimming is possible from June to October.
Does it rain much in Ulsan in April?
Rain falls on about 8 days, adding up to 90 mm.
Ulsan month by month
The whole year in UlsanAll destinations: South KoreaWhere to go in AprilSea temperature in April
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