18.05
mon
mon
Day
75°F
S 5 mph
Precip.
0%
0%
Night
66°F
NW 2 mph
Precip.
0%
0%
19.05
tue
tue
Day
73°F
W 2 mph
Precip.
0%
0%
Night
70°F
W 9 mph
Precip.
100%
100%
20.05
wed
wed
Day
66°F
W 19 mph
Precip.
100%
100%
Night
66°F
W 7 mph
Precip.
100%
100%
21.05
thu
thu
Day
63°F
SW 19 mph
Precip.
100%
100%
Night
63°F
SW 17 mph
Precip.
76%
76%
22.05
fri
fri
Day
66°F
W 13 mph
Precip.
0%
0%
Night
64°F
W 11 mph
Precip.
61%
61%
23.05
sat
sat
Day
70°F
W 5 mph
Precip.
100%
100%
Night
66°F
W 5 mph
Precip.
82%
82%
24.05
sun
sun
Day
73°F
W 9 mph
Precip.
64%
64%
Night
66°F
W 4 mph
Precip.
0%
0%
25.05
mon
mon
Day
77°F
W 7 mph
Precip.
0%
0%
Night
70°F
NW 8 mph
Precip.
0%
0%
26.05
tue
tue
Day
72°F
N 6 mph
Precip.
100%
100%
Night
68°F
E 13 mph
Precip.
100%
100%
27.05
wed
wed
Day
66°F
SE 19 mph
Precip.
0%
0%
Night
61°F
NE 11 mph
Precip.
0%
0%
28.05
thu
thu
Day
75°F
E 9 mph
Precip.
0%
0%
Night
68°F
N 1 mph
Precip.
0%
0%
29.05
fri
fri
Day
75°F
S 6 mph
Precip.
0%
0%
Night
68°F
SW 2 mph
Precip.
0%
0%
30.05
sat
sat
Day
73°F
W 15 mph
Precip.
64%
64%
Night
68°F
W 10 mph
Precip.
0%
0%
31.05
sun
sun
Day
72°F
W 16 mph
Precip.
0%
0%
Night
68°F
W 8 mph
Precip.
0%
0%
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 62.5°F. The highest and lowest sea temperatures during the month were 64.9°F and 59.5°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: 03:15
May 18, monday
0600
63°F
NW
4 mph
4 mph
0900
72°F
SE
4 mph
4 mph
1200
75°F
S
5 mph
5 mph
1500
77°F
S
5 mph
5 mph
1800
73°F
S
4 mph
4 mph
2100
68°F
N
4 mph
4 mph
May 19, tuesday
0000
66°F
NW
2 mph
2 mph
0300
64°F
N
4 mph
4 mph
