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 48.6 °F
Rainiest months:
August 8 days
September 7 days
July 7 days
Windiest months:
January 14.4 mph
December 14.1 mph
February 14.0 mph

Jeju on a weather map

Current weather
20:23
Jeju
+39°F
SE 14 mph
Feels like: +32°F
Precip.: 84%
Places in South Korea:
Name
°F
Yongpyong
+16°F
Incheon
+28°F
Muju
+23°F
Busan
+34°F
Seoul
+25°F
Jeju
+39°F
24 Hours Forecast
Jeju
Local time: 20:23
January 08, thursday
2100
39°F
SE
14 mph
January 09, friday
0000
39°F
SE
11 mph
0300
39°F
SE
8 mph
0600
39°F
SE
7 mph
0900
41°F
E
8 mph
1200
46°F
E
11 mph
1500
45°F
E
12 mph
1800
41°F
NE
11 mph
Units of measurement: °C / °F