Annual mean 15°C · wettest around June · prevailing wind NE
Warmest
31.2 °C
Coldest
5.1 °C
Wettest
89%
Windiest
3.8 m/s
Prevailing
NE
3.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Ulsan over the whole year is 15°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 0°C. Ulsan has no sharply defined rainy season: the chance of rain on a given day runs from 48% in October, the driest month, to 66% in June, the wettest. Winds in Ulsan are highest in February, averaging 2.9 m/s (10 km/h), and lightest in June, at 2.3 m/s (8 km/h). The prevailing wind is from the NE. The clearest skies in Ulsan come in December, when the sky is typically 39% covered; July is the cloudiest month, at 69%.
Month by month Ulsan climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
5°C
0°C
0°C
55%
42%
2.8 m/s
0
0
11
February
7°C
1°C
2°C
59%
46%
2.9 m/s
2
0
23
March
13°C
6°C
8°C
54%
51%
2.8 m/s
12
0
57
April
17°C
10°C
14°C
60%
51%
2.8 m/s
42
1
76
May
22°C
15°C
20°C
54%
57%
2.5 m/s
77
16
64
June
25°C
20°C
26°C
66%
63%
2.3 m/s
60
51
24
July
28°C
23°C
31°C
64%
69%
2.3 m/s
23
43
7
August
30°C
25°C
33°C
63%
60%
2.4 m/s
9
36
2
September
25°C
20°C
26°C
61%
68%
2.4 m/s
60
44
26
October
20°C
14°C
18°C
48%
55%
2.3 m/s
71
11
72
November
14°C
8°C
11°C
56%
43%
2.3 m/s
29
0
67
December
7°C
1°C
2°C
62%
39%
2.6 m/s
1
0
22
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Ulsan weather by season
Year round, Ulsan has days of about 5°C at their warmest in January, its coolest month, and 30°C in August, its warmest; the coolest hours of the day run from 0°C to 25°C through the year, and the average temperature over the year is 15°C around the clock. Rain is most likely around June and least likely around October. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Ulsan weather in winterDecember to February
High 6°CLow 1°CRain 59%
Winter in Ulsan has typical daily highs of about 6°C and lows of about 1°C, with a 59% chance of rain on a given day.
Ulsan weather in springMarch to May
High 17°CLow 10°CRain 56%
Spring in Ulsan has typical daily highs of about 17°C and lows of about 10°C, with a 56% chance of rain on a given day.
Ulsan weather in summerJune to August
High 28°CLow 23°CRain 64%
Summer in Ulsan has typical daily highs of about 28°C and lows of about 23°C, with a 64% chance of rain on a given day.
Ulsan weather in autumnSeptember to November
High 20°CLow 14°CRain 55%
Autumn in Ulsan has typical daily highs of about 20°C and lows of about 14°C, with a 55% chance of rain on a given day.
When is the rainy season in Ulsan?
Ulsan has no sharply defined rainy season: the chance of rain on a given day runs from 48% in October, the driest month, to 66% in June, the wettest.
What time of year is Ulsan windiest?
Winds in Ulsan are highest in February, averaging 2.9 m/s (10 km/h), and lightest in June, at 2.3 m/s (8 km/h). The prevailing wind is from the NE.
What is the average temperature in Ulsan year round?
The average temperature in Ulsan over the whole year is 15°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 0°C.