27.08
thu
thu
Day
88°F
NW 7 mph
Precip.
25%
25%
Night
79°F
NW 6 mph
Precip.
26%
26%
28.08
fri
fri
Day
86°F
SE 6 mph
Precip.
18%
18%
Night
79°F
N 2 mph
Precip.
27%
27%
29.08
sat
sat
Day
84°F
SE 4 mph
Precip.
19%
19%
Night
79°F
NE 4 mph
Precip.
23%
23%
30.08
sun
sun
Day
82°F
SE 6 mph
Precip.
44%
44%
Night
77°F
NW 2 mph
Precip.
29%
29%
31.08
mon
mon
Day
81°F
SW 9 mph
Precip.
20%
20%
Night
77°F
SW 9 mph
Precip.
14%
14%
01.09
tue
tue
Day
77°F
SW 14 mph
Precip.
37%
37%
Night
75°F
SW 23 mph
Precip.
76%
76%
02.09
wed
wed
Day
73°F
SW 19 mph
Precip.
92%
92%
Night
73°F
SW 20 mph
Precip.
89%
89%
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 82.0°F. The highest and lowest sea temperatures during the month were 85.8°F and 79.0°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 82.5°F. The highest and lowest sea temperatures during the month were 85.6°F and 77.9°F.
Air temperature in Jeju, °F
Precipitation total in Jeju, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Jeju
Jeju on a weather map
Places in South Korea:
Name
°F
24 Hours Forecast
Jeju
Local time: 03:20
August 27, thursday
0600
77°F
NW
7 mph
7 mph
0900
84°F
NW
6 mph
6 mph
1200
88°F
NW
7 mph
7 mph
1500
84°F
NW
1 mph
1 mph
1800
82°F
NW
4 mph
4 mph
2100
79°F
NW
6 mph
6 mph
August 28, friday
0000
79°F
NW
6 mph
6 mph
0300
77°F
N
3 mph
3 mph
