16.09
wed
wed
Day
73°F
SW 15 mph
Precip.
24%
24%
Night
70°F
W 16 mph
Precip.
5%
5%
17.09
thu
thu
Day
72°F
SW 19 mph
Precip.
26%
26%
Night
70°F
W 20 mph
Precip.
31%
31%
18.09
fri
fri
Day
72°F
W 20 mph
Precip.
64%
64%
Night
72°F
W 17 mph
Precip.
27%
27%
19.09
sat
sat
Day
72°F
SW 17 mph
Precip.
23%
23%
Night
70°F
W 13 mph
Precip.
9%
9%
20.09
sun
sun
Day
72°F
SW 12 mph
Precip.
4%
4%
Night
68°F
SE 2 mph
Precip.
10%
10%
21.09
mon
mon
Day
75°F
SW 7 mph
Precip.
2%
2%
Night
68°F
W 7 mph
Precip.
5%
5%
22.09
tue
tue
Day
73°F
SW 14 mph
Precip.
4%
4%
Night
70°F
W 13 mph
Precip.
8%
8%
23.09
wed
wed
Day
75°F
SW 13 mph
Precip.
6%
6%
Night
70°F
W 4 mph
Precip.
9%
9%
24.09
thu
thu
Day
77°F
S 7 mph
Precip.
3%
3%
Night
72°F
W 2 mph
Precip.
6%
6%
25.09
fri
fri
Day
79°F
W 11 mph
Precip.
3%
3%
Night
72°F
N 2 mph
Precip.
8%
8%
26.09
sat
sat
Day
79°F
SE 5 mph
Precip.
5%
5%
Night
72°F
NE 9 mph
Precip.
13%
13%
27.09
sun
sun
Day
70°F
S 7 mph
Precip.
25%
25%
Night
70°F
W 14 mph
Precip.
39%
39%
28.09
mon
mon
Day
72°F
W 20 mph
Precip.
20%
20%
Night
68°F
W 17 mph
Precip.
20%
20%
29.09
tue
tue
Day
72°F
W 12 mph
Precip.
33%
33%
Night
66°F
E 11 mph
Precip.
73%
73%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 80.8°F. The highest and lowest sea temperatures during the month were 85.1°F and 77.0°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: 13:04
September 16, wednesday
1500
75°F
SW
16 mph
16 mph
1800
73°F
W
14 mph
14 mph
2100
72°F
W
14 mph
14 mph
September 17, thursday
0000
70°F
W
16 mph
16 mph
0300
70°F
W
17 mph
17 mph
0600
70°F
SW
17 mph
17 mph
0900
72°F
SW
17 mph
17 mph
1200
72°F
SW
19 mph
19 mph
