World Resorts South Korea Seoul Weather

Seoul Sea Temperature in September

Average sea water temperature in September:
+74.9°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 75.8°F. The highest and lowest sea temperatures during the month were 79.7°F and 72.7°F.

Monthly sea water temperature in Seoul, °F

Which South Korea resorts have warmest sea in September?

Place name September 2026 September 2025
Jeju 79.1°F 82.5°F
Busan 78.9°F 77.8°F
Incheon 76.9°F 78.3°F
Seoul 75.8°F 76.6°F
Yongpyong 74.9°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
May 4 days
Windiest months:
April 7.1 mph
March 7.1 mph
May 6.5 mph

Seoul on a weather map

Current weather
22:38
Seoul
+63°F
E 2 mph
Feels like: +63°F
Precip.: 2%
Places in South Korea:
Name
°F
Yongpyong
+52°F
Incheon
+63°F
Muju
+46°F
Busan
+66°F
Seoul
+63°F
Jeju
+63°F
24 Hours Forecast
Seoul
Local time: 22:38
October 07, wednesday
0000
63°F
E
2 mph
0300
61°F
SE
1 mph
0600
57°F
S
1 mph
0900
63°F
SW
2 mph
1200
72°F
SE
2 mph
1500
73°F
E
6 mph
1800
70°F
E
8 mph
2100
66°F
E
2 mph
Units of measurement: °C / °F