Ulsan weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Fair
Best time to visit: April – June, September – October
What is the weather like in Ulsan in January?
In January, Ulsan is cold: daytime highs average 6 °C, and nights often drop below freezing (−1 °C). The sea averages 14.8 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is rare: about 4 days bring 30 mm in total. All in all, January is a so-so month for a holiday in Ulsan.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 41 | 40 | 40 |
| Day | 8° | 6° | 8° |
| Night | 1° | −1° | 1° |
| Sea | 17° | 15° | 14° |
| Sun | 6 h | 6 h | 7 h |
| Rain days | 3 | 4 | 5 |
More details for January
- Daylight
- 10 h 0 min07:31 – 17:31
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 39 %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 %0 %
- Sunshineweight 20 %53 %
- Few rainy daysweight 30 %99 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- Warm jacket
Ulsan in January: quick answers
Is Ulsan hot in January?
No. In January, Ulsan is cold: daytime highs average 6 °C and nights drop to about −1 °C.
Can you swim in Ulsan in January?
Only if you don't mind cold water: in January the sea averages just 14.8 °C. Comfortable swimming is possible from June to October.
Does it rain much in Ulsan in January?
Rain is rare: about 4 days bring 30 mm in total.
Ulsan month by month
The whole year in UlsanAll destinations: South KoreaWhere to go in JanuarySea temperature in January
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