Ulsan Weather in December
With daytime temperatures of 10°C (50°F) and nighttime lows of 1°C (34°F), December in Ulsan brings low temperatures during the day. It is also the driest month of the year, with minimal rainfall.
Rainfall in Ulsan in December
This is the driest month, making it a great choice for planning outdoor excursions, even if the weather is on the cooler side. Typically, about 5 days will experience rainfall, with an average of 29 mm (1.1 in) for the month. Rain is scarce this month and when it does fall, it tends to be light. Unlikely to disrupt plans significantly.
Temperature in Ulsan in December
If you're visiting Ulsan in December, expect highs of 10°C (50°F) and overnight lows around 1°C (34°F). December marks the winter season. Even at the warmest part of the day, temperatures stay low. Dressing warmly from the start is the sensible approach. With overnight lows of 1°C (34°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Ulsan in December
The days are predominantly sunny, with an estimated total of around 196 hours of sunshine. Despite the cool temperatures, these sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you prefer dry days with pleasant temperatures, October typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Ulsan's climate page.
Ulsan Temperature in December
Min Temperature
1°C (34°F)
Max Temperature
10°C (50°F)
Chance of Rain
15%
Precipitation
29 mm (1.1 in)
Rainy days
5 days
Humidity
52%
Sunshine
196 hours
Percentage Sunshine
63%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Ulsan typically drop from around 11°C (52°F) at the start of December to approximately 8°C (46°F) by the end. Nights are very cold, with lows typically ranging from -3°C (27°F) to 1°C (34°F).
Average temperatures in December
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 December
Historical weather for Ulsan in December
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 December
Based on weather observations in Ulsan between 1976 and 2025, these are the recorded extremes during December.
- On December 28, 1987, temperatures climbed to 21°C (70°F), marking the warmest December day on record.
- Ulsan experienced its chilliest December day on December 27, 1976, reaching only -5°C (23°F).
- Ulsan registered its coldest December night on December 27, 1976, with temperatures dropping to -12°C (10°F).
Best Places in South Korea in December
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 December →
perfect weather
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tolerable
unpleasant
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What to Wear in Ulsan in December
The weather can be unpredictable in December, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. Some rain is possible, so pack something to handle light showers. 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 December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Ulsan's climate page.
Temperature Rainfall Sunshine Humidity
See the full Ulsan climate overview or explore weather in South Korea.
