Climate averages 1991–2020
Ulsan weather
in April.
A mild, wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Ulsan: daytime highs average 17.3°C and nights cool to about 8.1°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 92 mm of rain on roughly 8 days, which makes April a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 04 min on an average April day.
The nearest other city in this atlas is Ungsang (20 km away). In April its highs average 16.8°C, about as warm as Ulsan, with 92 mm of rain.
Among the 79 cities listed in South Korea, Ulsan ranks joint 32nd of 79 for the warmest April highs and joint 60th of 79 for the driest April (rainfall, lowest first). The mean April high of those 79 cities is 16.9°C; Ulsan is 0.3°C warmer than that mean.
From April to May, average highs rise by 4.3°C to 21.6°C, and monthly rainfall rises from 92 mm to 100 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Ulsan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.1°C-1.0°C | -1.0°C | 31 | 4.4 | 10.010 h |
| February | 8.2°C0.1°C | 0.1°C | 39 | 5.1 | 10.911 h |
| March | 12.3°C3.6°C | 3.6°C | 71 | 7.4 | 11.912 h |
| April, selected | 17.3°C8.1°C | 8.1°C | 92 | 7.5 | 13.113 h |
| May | 21.6°C13.0°C | 13.0°C | 100 | 7.8 | 14.014 h |
| June | 24.4°C17.6°C | 17.6°C | 143 | 9.1 | 14.515 h |
| July | 27.3°C22.2°C | 22.2°C | 216 | 13.3 | 14.314 h |
| August | 28.3°C23.5°C | 23.5°C | 213 | 14.1 | 13.513 h |
| September | 24.6°C19.4°C | 19.4°C | 173 | 10.4 | 12.412 h |
| October | 20.1°C13.5°C | 13.5°C | 73 | 5.1 | 11.311 h |
| November | 14.3°C6.8°C | 6.8°C | 48 | 4.9 | 10.310 h |
| December | 8.0°C0.8°C | 0.8°C | 27 | 3.6 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Ungsang in AprilSouth Korea · 20 kmHigh 16.8°C · Low 8.3°C · 92 mm rain
- Yangsan in AprilSouth Korea · 34 kmHigh 17.9°C · Low 8.2°C · 111 mm rain
- Gijang in AprilSouth Korea · 34 kmHigh 16.0°C · Low 9.7°C · 120 mm rain
- Gyeongju in AprilSouth Korea · 35 kmHigh 18.6°C · Low 7.2°C · 79 mm rain
- Kimhae in AprilSouth Korea · 52 kmHigh 17.2°C · Low 8.5°C · 111 mm rain
- Pohang in AprilSouth Korea · 55 kmHigh 17.6°C · Low 8.0°C · 74 mm rain
- Busan in AprilSouth Korea · 55 kmHigh 16.0°C · Low 9.4°C · 121 mm rain
- Gyeongsan-si in AprilSouth Korea · 61 kmHigh 19.1°C · Low 7.5°C · 77 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Ulsan) is explained once on the Ulsan year overview and on the Sources, method and limits page.
Ungsang lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.