World Resorts South Korea Jeju Weather

Jeju Sea Temperature in September

Average sea water temperature in September:
+77.5°F
Minimum sea water temperature in September: 85.6°F
Maximum sea water temperature in September: 70.0°F

Daily 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.

Monthly sea water temperature in Jeju, °F

Which South Korea resorts have warmest sea in September?

Place name September 2025 September 2024
Jeju 82.5°F 82.6°F
Incheon 78.3°F 80.1°F
Busan 77.8°F 81.6°F
Seoul 76.6°F 78.3°F
Yongpyong 76.5°F 76.1°F

Best time for vacation in Jeju

Sunniest months:
May 15 days
October 14 days
April 14 days
Warmest months:
August 84.5 °F
July 82.0 °F
September 77.7 °F
Warmest sea temp:
August 81.2 °F
September 77.5 °F
July 76.6 °F
Coldest months:
January 44.8 °F
February 46.2 °F
December 48.5 °F
Rainiest months:
August 8 days
September 7 days
July 7 days
Windiest months:
January 14.4 mph
December 14.3 mph
February 14.0 mph

Jeju on a weather map

Current weather
09:21
Jeju
+45°F
S 21 mph
Feels like: +36°F
Precip.: 0%
Places in South Korea:
Name
°F
Yongpyong
+25°F
Incheon
+32°F
Muju
+28°F
Busan
+46°F
Seoul
+30°F
Jeju
+45°F
24 Hours Forecast
Jeju
Local time: 09:21
December 21, sunday
1200
45°F
S
21 mph
1500
45°F
S
19 mph
1800
43°F
S
17 mph
2100
41°F
S
16 mph
December 22, monday
0000
41°F
S
14 mph
0300
39°F
S
11 mph
0600
39°F
S
6 mph
0900
43°F
SW
9 mph
Units of measurement: °C / °F