Ulsan climate: monthly averages: annual mean temperature 14.4 C; warmest month Aug (25.8 C); coldest month Jan (2.7 C).
Annual mean temperature: 14.4 C
Warmest month: Aug (25.8 C)
Coldest month: Jan (2.7 C)
Wettest month: Jul (7.74 mm/day)
All-time record high: 34.6 C
All-time record low: -11.9 C
Ulsan’s climate features a mild but variable annual average of **14.4°C**, with warm summers peaking in August at **25.8°C** and chilly winters dipping to **2.7°C** in January. The region receives **1,321 mm of rain yearly**, concentrated in July (7.74 mm/day). Extreme temperatures range from **-11.9°C** to **34.6°C**, reflecting seasonal contrasts.
Annual mean temperature 14.4 C
Warmest month Aug (25.8 C)
Coldest month Jan (2.7 C)
Wettest month Jul (7.74 mm/day)
All-time record high 34.6 C
All-time record low -11.9 C
Annual precipitation 1,321 mm / year
Coordinates 35.53722, 129.31667
Population 1,098,421
Average monthly temperature and rainfall in Ulsan
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
2.7
1.36
16.6
-11.9
Feb
4.7
1.89
18.2
-11.1
Mar
8.2
2.39
19.0
-4.3
Apr
12.7
3.72
23.9
2.0
May
17.1
3.80
30.8
5.4
Jun
20.7
5.00
31.5
12.9
Jul
24.2
7.74
32.4
17.5
Aug
25.8
6.27
34.6
18.9
Sep
22.2
5.59
29.7
14.2
Oct
17.4
2.45
25.9
3.6
Nov
11.3
1.80
22.0
-1.3
Dec
4.8
1.35
18.8
-8.9
What the Ulsan climate table shows
Values are multi-decadal climatological averages for the 35.53722, 129.31667 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
**What’s Ulsan’s wettest month?**?
July averages **7.74 mm of rain per day**, the highest monthly precipitation.
**How does Ulsan’s summer compare to its winter?**?
Summer (Aug) averages **25.8°C**, while winter (Jan) drops to **2.7°C**, a **23°C difference**.