January weather forecast
Ulsan, South Korea

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Weather in January

Ulsan, South Korea, greets the new year with cold temperatures and snowfall. This month records the coldest of the year with maximum and minimum average temperatures settling at is 4.8°C (40.6°F) and -1.3°C (29.7°F) respectively. It's a wintry start to the year that offers crisp morning walks and cozy nights. The city experiences a relatively dry season, despite occasional precipitation. The chill is complemented by clear skies, long daylight hours, and relatively low humidity.

Temperature

Ulsan's January weather, with an average high temperature of 4.8°C (40.6°F) and an average low temperature of -1.3°C (29.7°F), tends to be the coldest of the year.

Humidity

With an average relative humidity of 60%, January is the least humid month.

Rainfall

In January, the rain falls for 5.3 days. Throughout January, 30mm (1.18") of precipitation is accumulated. Throughout the year, there are 129.7 rainfall days, and 902mm (35.51") of precipitation is accumulated.

Snowfall

Months with snowfall in Ulsan are January through March and December. In Ulsan, in January, during 0.5 snowfall days, 5mm (0.2") of snow is typically accumulated. Throughout the year, there are 3.5 snowfall days, and 25mm (0.98") of snow is accumulated.

Sea temperature

In Ulsan, in January, the average water temperature is 13.9°C (57°F).
Note: Dipping into 13.9°C (57°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.

Daylight

In January, the average length of the day in Ulsan is 10h and 4min.
On the first day of the month, sunrise is at 07:31 and sunset at 17:19. On the last day of January, in Ulsan, sunrise is at 07:23 and sunset at 17:48 KST.

Sunshine

The average sunshine in January in Ulsan, South Korea, is 6.3h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily high UV index of 2 in January translates into this advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
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Frequently asked questions

What part of the year is the coldest in Ulsan?

Ulsan, South Korea, experiences its average lowest temperatures in January, reaching a peak of 4.8°C (40.6°F) and a minimum of -1.3°C (29.7°F).

How cold is it in Ulsan in January?

The high-temperature, in January, in Ulsan, records 4.8°C (40.6°F), while the low-temperature is -1.3°C (29.7°F).

What is the least humid month in Ulsan?

With an average relative humidity of 60%, January is the least humid month in Ulsan, South Korea.

What is the average humidity in January in Ulsan?

In January, the average relative humidity in Ulsan is 60%.

How many days does it rain in January in Ulsan?

In Ulsan, during January, the rain falls for 5.3 days and regularly aggregates up to 30mm (1.18") of precipitation.

How many days does it snow in January in Ulsan?

In Ulsan, South Korea, in January, during 0.5 snowfall days, 5mm (0.2") of snow is typically accumulated.

What is the water temperature in January in Ulsan?

In Ulsan, South Korea, in January, the average water temperature is 13.9°C (57°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

How many hours of daylight does Ulsan have in January?

In January, the average day length in Ulsan, South Korea, is 10h and 4min.

What time are sunrise and sunset in January in Ulsan?

On the first day of January, sunrise is at 07:31 and sunset at 17:19. On the last day of the month, sunrise is at 07:23 and sunset at 17:48 KST.

How long on average sun shines in January in Ulsan?

In January, the average sunshine duration in Ulsan, South Korea, is 6.3h.

What is the month with the lowest UV index in Ulsan?

The months with the lowest UV index in Ulsan, South Korea, are January and December, with an average maximum UV index of 2.

How high is the UV index in January in Ulsan?

In January, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a low health threat from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
6.7°C 44.1°F
4.8°C 40.6°F
7.2°C 45°F
Average low temperature
1.3°C 34.3°F
-1.3°C 29.7°F
1.1°C 34°F
Average pressure
1022.5mbar 30.19inHg
1023.1mbar 30.21inHg
1022mbar 30.18inHg
Average wind speed
17.1km/h 10.6mph
17.1km/h 10.6mph
15.9km/h 9.9mph
Average max. wind speed
17.9km/h 11.1mph
17.9km/h 11.1mph
16.7km/h 10.4mph
Average wind speed gusts
24.3km/h 15.1mph
24.5km/h 15.2mph
22.9km/h 14.2mph
Average humidity
62%
60%
62%
Average rainfall
29mm 1.14"
30mm 1.18"
35mm 1.38"
Average rainfall days
6
5.3
6.8
Average snowfall
1mm 0.04"
5mm 0.2"
13mm 0.51"
Average snowfall days
0.6
0.5
1.8
Average sea temperature
15.8°C 60.4°F
13.9°C 57°F
12.4°C 54.3°F
Average daylight
9h 5min
10h 1min
10h 5min
Average sunshine
6h 2min
6h 2min
6h 5min
Average sunshine days
23.5
24.8
19
Average UV index
2
2
3
Average cloud cover
25%
26%
35%
Average visibility
10km 6.2mi
10km 6.2mi
10km 6.2mi

Average temperature in January
Ulsan, South Korea

Average temperature in January - Ulsan, South Korea
  • Average high temperature in January: 4.8°C

The warmest month (with the highest average high temperature) is August (28°C).
The month with the lowest average high temperature is January (4.8°C).

  • Average low temperature in January: -1.3°C

The month with the highest average low temperature is August (23.3°C).
The coldest month (with the lowest average low temperature) is January (-1.3°C).

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Average pressure in January
Ulsan, South Korea

Average pressure in January - Ulsan, South Korea
  • Average pressure in January: 1023.1mbar

The month with the highest atmospheric pressure is January (1023.1mbar).
The month with the lowest atmospheric pressure is July (1007.6mbar).

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Average wind speed in January
Ulsan, South Korea

Average wind speed in January - Ulsan, South Korea
  • Average wind speed in January: 17.1km/h

The windiest months (with the highest average wind speed) are January and December (17.1km/h).
The calmest month (with the lowest average wind speed) is June (11.5km/h).

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Average humidity in January
Ulsan, South Korea

Average humidity in January - Ulsan, South Korea
  • Average humidity in January: 60%

The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is January (60%).

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Average rainfall in January
Ulsan, South Korea

Average rainfall in January - Ulsan, South Korea
  • Average rainfall in January: 30mm

The wettest month (with the highest rainfall) is July (180mm).
The driest month (with the least rainfall) is November (28mm).

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Average rainfall days in January
Ulsan, South Korea

Average rainfall days in January - Ulsan, South Korea
  • Average rainfall days in January: 5.3 days

The month with the highest number of rainy days is July (19.8 days).
The month with the least rainy days is January (5.3 days).

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Average snowfall in January
Ulsan, South Korea

Average snowfall in January - Ulsan, South Korea
  • Average snowfall in January: 5mm

The month with the highest snowfall is February (13mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in January
Ulsan, South Korea

Average snowfall days in January - Ulsan, South Korea
  • Average snowfall days in January: 0.5 days

The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in January
Ulsan, South Korea

Average sea temperature in January - Ulsan, South Korea
  • Average sea temperature in January: 13.9°C

The best month for swimming (with the highest average sea temperature) is August (25.6°C).
The coldest month (with the lowest average sea temperature) is March (12.3°C).

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Average daylight in January /
Average sunshine in January
Ulsan, South Korea

Average daylight in January / Average sunshine in January - Ulsan, South Korea
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in January: 6h and 2min

The month with the most sunshine is May (Average sunshine: 9h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 0min).

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Average sunshine days in January
Ulsan, South Korea

Average sunshine days in January - Ulsan, South Korea
  • Average sunshine days in January: 24.8 days

The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is July (8.7 days).

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Average UV index in January
Ulsan, South Korea

Average UV index in January - Ulsan, South Korea
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in January
Ulsan, South Korea

Average cloud cover in January - Ulsan, South Korea
  • Average cloud cover in January: 26

The month with the most cloud cover is July (Cloud cover 46).
The month with the least cloud cover is December (Cloud cover 25).

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Average visibility in January
Ulsan, South Korea

Average visibility in January - Ulsan, South Korea
  • Average visibility in January: 10km

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).

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Ulsan, South Korea

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