World Resorts South Korea Incheon Weather

Incheon Sea Temperature in September

Average sea water temperature in September:
+75.4°F
Minimum sea water temperature in September: 82.6°F
Maximum sea water temperature in September: 69.6°F

Daily sea water temperature in September, °F

Show year:
2025
2024
2023

The average sea water temperature in September of 2025 was 78.3°F. The highest and lowest sea temperatures during the month were 82.4°F and 73.0°F.

Monthly sea water temperature in Incheon, °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 Incheon

Sunniest months:
October 18 days
May 18 days
March 18 days
Warmest months:
August 84.4 °F
July 82.0 °F
September 78.6 °F
Warmest sea temp:
August 79.1 °F
September 75.4 °F
July 74.7 °F
Coldest months:
January 33.9 °F
February 37.6 °F
December 38.0 °F
Rainiest months:
July 10 days
August 8 days
June 5 days
Windiest months:
December 11.1 mph
November 10.3 mph
February 10.3 mph

Incheon on a weather map

Current weather
05:17
Incheon
+46°F
NW 6 mph
Feels like: +45°F
Precip.: 100%
Places in South Korea:
Name
°F
Yongpyong
+41°F
Incheon
+46°F
Muju
+46°F
Busan
+54°F
Seoul
+45°F
Jeju
+55°F
24 Hours Forecast
Incheon
Local time: 05:17
December 20, saturday
0600
46°F
NW
6 mph
0900
48°F
N
6 mph
1200
48°F
E
6 mph
1500
46°F
SE
10 mph
1800
45°F
SE
15 mph
2100
41°F
SE
16 mph
December 21, sunday
0000
39°F
SE
16 mph
0300
36°F
SE
17 mph
Units of measurement: °C / °F