World Resorts South Korea Seoul Weather

Seoul Sea Temperature in September

Average sea water temperature in September:
+75.0°F
Minimum sea water temperature in September: 81.0°F
Maximum sea water temperature in September: 69.4°F

Daily sea water temperature in September, °F

Show year:
2026
2025
2024

The average sea water temperature in September of 2026 was 77.5°F. The highest and lowest sea temperatures during the month were 79.7°F and 75.0°F.

Monthly sea water temperature in Seoul, °F

Which South Korea resorts have warmest sea in September?

Place name September 2026 September 2025
Jeju 80.8°F 82.5°F
Busan 80.5°F 77.8°F
Incheon 78.7°F 78.3°F
Seoul 77.5°F 76.6°F
Yongpyong 75.6°F 76.5°F

Best time for vacation in Seoul

Sunniest months:
May 19 days
October 18 days
March 17 days
Warmest months:
August 87.0 °F
July 85.8 °F
June 82.2 °F
Warmest sea temp:
August 78.9 °F
September 74.9 °F
July 74.8 °F
Coldest months:
January 32.6 °F
December 36.0 °F
February 38.3 °F
Rainiest months:
July 11 days
August 8 days
September 5 days
Windiest months:
April 7.1 mph
March 7.1 mph
May 6.5 mph

Seoul on a weather map

Current weather
13:04
Seoul
+79°F
W 4 mph
Feels like: +77°F
Precip.: 0%
Places in South Korea:
Name
°F
Yongpyong
+72°F
Incheon
+79°F
Muju
+75°F
Busan
+77°F
Seoul
+79°F
Jeju
+73°F
24 Hours Forecast
Seoul
Local time: 13:04
September 16, wednesday
1500
82°F
W
4 mph
1800
79°F
N
2 mph
2100
73°F
S
1 mph
September 17, thursday
0000
70°F
W
3 mph
0300
66°F
W
3 mph
0600
64°F
W
4 mph
0900
70°F
W
4 mph
1200
77°F
W
6 mph
Units of measurement: °C / °F