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:
2025
2024
2023

The average sea water temperature in September of 2025 was 76.6°F. The highest and lowest sea temperatures during the month were 81.0°F and 72.1°F.

Monthly sea water temperature in Seoul, °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 Seoul

Sunniest months:
May 19 days
October 18 days
March 17 days
Warmest months:
August 87.0 °F
July 85.9 °F
June 82.2 °F
Warmest sea temp:
August 78.7 °F
September 74.9 °F
July 74.7 °F
Coldest months:
January 32.6 °F
December 36.0 °F
February 38.3 °F
Rainiest months:
July 11 days
August 8 days
June 5 days
Windiest months:
April 7.1 mph
March 7.1 mph
May 6.5 mph

Seoul on a weather map

Current weather
23:20
Seoul
+57°F
NE 11 mph
Feels like: +55°F
Precip.: 100%
Places in South Korea:
Name
°F
Yongpyong
+52°F
Incheon
+54°F
Muju
+48°F
Busan
+59°F
Seoul
+57°F
Jeju
+57°F
24 Hours Forecast
Seoul
Local time: 23:20
April 28, tuesday
0000
57°F
NE
11 mph
0300
55°F
NE
8 mph
0600
55°F
NE
8 mph
0900
55°F
NE
11 mph
1200
57°F
E
14 mph
1500
61°F
E
15 mph
1800
59°F
E
14 mph
2100
57°F
SE
9 mph
Units of measurement: °C / °F