Ulsan in Spring
In spring (March, April and May), Ulsan sees average daytime highs around 18°C and overnight lows near 8°C, with 263 mm of precipitation over about 23 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs climb from about 11°C in early March to 24°C by late May. The sky is clear or mostly clear about 37% of the time across spring, and the air most often feels dry.
Spring is Ulsan's 2nd-best season to visit on our travel score. For the whole year in context, see Ulsan's year-round climate.
- Avg daytime high
- 18°C
- 3rd-warmest season
- Avg overnight low
- 8°C
- Precipitation
- 263 mm
- 23 wet days
- Avg wind
- 12 km/h
- Travel score
- 5.8
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in Ulsan in Spring
Over the season highs climb from about 11°C in early March to 24°C by late May.
A typical spring day in Ulsan reaches about 18°C and drops to 8°C overnight. The warmest of the three months is May, the coolest March.
How spring really feels in Ulsan
Once humidity and wind are folded in, spring brings about 0 days that feel above 32°C and 13 that feel at or below 0°C.
The story in spring is cold — wind chill drags the overnight "feels like" below the raw low.
Ulsan weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / -1° | 31 | 4.4 | 0.7 | 9.9 | 1.0 |
| Feb | 9° / 0° | 39 | 5 | 0.9 | 10.7 | 2.0 |
| Mar | 13° / 4° | 71 | 7.4 | 0.5 | 11.7 | 4.0 |
| Apr | 18° / 8° | 92 | 7.6 | 0 | 12.9 | 6.3 |
| May | 23° / 13° | 100 | 7.8 | 0 | 13.8 | 7.1 |
| Jun | 25° / 18° | 143 | 9.1 | 0 | 14.4 | 6.7 |
| Jul | 28° / 23° | 216 | 13.3 | 0 | 14.2 | 5.3 |
| Aug | 29° / 23° | 213 | 14.2 | 0 | 13.3 | 4.9 |
| Sep | 25° / 19° | 173 | 10.4 | 0 | 12.2 | 6.6 |
| Oct | 21° / 13° | 73 | 5.1 | 0 | 11.1 | 7.4 |
| Nov | 15° / 6° | 48 | 4.9 | 0.1 | 10.1 | 5.4 |
| Dec | 9° / 1° | 27 | 3.6 | 0.3 | 9.6 | 2.2 |
Cloud cover in Spring
The sky is clear or mostly clear about 37% of the time across spring.
Chance of precipitation in Spring
Ulsan gets around 263 mm of rain and snow over 23 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 12 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 12 min in early March to 14 h 12 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 5.3 kWh/m².
Hazard calendar for Ulsan
In spring, Ulsan overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Ulsan sits in the Pacific typhoon belt; the season peaks July–October.
Ulsan's rainy season runs May–September, when most of the year's rain falls.
Is spring a good time to visit Ulsan?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit Ulsan for sightseeing.
What to pack for Ulsan in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Ulsan sees daytime highs around 18°C and nights near 8°C. Worth packing: light clothes, a warm layer and sun protection. About 23 days see rain.
Sea temperature near Ulsan in Spring
The nearest coast averages about 15°C across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 19 km away) is warmest in August at about 26°C and coldest in February near 14°C.
It's comfortable for a long swim from Jun 17 to Nov 9 — about 4.8 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 14 | 14 | 15 | 17 | 20 | 23 | 26 | 25 | 22 | 20 | 17 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 14 | Bracing |
| Mar | 14 | Bracing |
| Apr | 15 | Bracing |
| May | 17 | Cool |
| Jun | 20 | Refreshing |
| Jul | 23 | Refreshing |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 22 | Refreshing |
| Nov | 20 | Cool |
| Dec | 17 | Cool |
UV index in Ulsan in Spring
Clear-sky midday UV across spring averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ulsan peaks around August 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 5 | 7 | 8 | 8 | 9 | 9 | 9 | 5 | 4 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | High |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 9 | Very high |
| Oct | 5 | High |
| Nov | 4 | Moderate |
| Dec | 2 | Moderate |
Air quality in Ulsan in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Ulsan is worst in March — around 21 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (August, 13 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Ulsan's WHO annual average of 17 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 16 | 18 | 21 | 21 | 20 | 17 | 14 | 13 | 14 | 16 | 18 | 15 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 16 | Moderate |
| Feb | 18 | Moderate |
| Mar | 21 | Moderate |
| Apr | 21 | Moderate |
| May | 20 | Moderate |
| Jun | 17 | Moderate |
| Jul | 14 | Moderate |
| Aug | 13 | Moderate |
| Sep | 14 | Moderate |
| Oct | 16 | Moderate |
| Nov | 18 | Moderate |
| Dec | 15 | Moderate |
Where is Ulsan?
Ulsan sits at 35.5°N, 129.3°E, 10 m above sea level, in South Korea. The nearest listed city is Ungsang, 20 km away.
Topography around Ulsan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ulsan.
Within 3 km, the terrain around Ulsan has only modest variations in elevation — a maximum elevation change of 136 m around an average of 26 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 752 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,204 m.
The land around Ulsan is covered by artificial surfaces (61%) and trees (30%) within 3 km, trees (55%) within 16 km, and trees (44%) and water (40%) within 80 km.
South Korea travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 220 V · 60 Hz
- Prices
- ≈ 57% of US
- price level, 2025
- GDP per capita
- $36,227
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.5
- per 100k, 2023
- Road deaths
- 8.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 522
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ulsan (35.5372°, 129.3167°, elevation 10 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.