16.09
wed
wed
Day
79°F
W 2 mph
Precip.
0%
0%
Night
72°F
NW 3 mph
Precip.
1%
1%
17.09
thu
thu
Day
79°F
W 6 mph
Precip.
9%
9%
Night
72°F
W 5 mph
Precip.
12%
12%
18.09
fri
fri
Day
79°F
W 10 mph
Precip.
8%
8%
Night
70°F
W 7 mph
Precip.
3%
3%
19.09
sat
sat
Day
79°F
W 8 mph
Precip.
1%
1%
Night
72°F
W 6 mph
Precip.
2%
2%
20.09
sun
sun
Day
79°F
SE 4 mph
Precip.
10%
10%
Night
72°F
S 4 mph
Precip.
4%
4%
21.09
mon
mon
Day
81°F
S 2 mph
Precip.
1%
1%
Night
73°F
S 2 mph
Precip.
3%
3%
22.09
tue
tue
Day
82°F
NW 6 mph
Precip.
9%
9%
Night
73°F
N 3 mph
Precip.
3%
3%
23.09
wed
wed
Day
77°F
NE 9 mph
Precip.
2%
2%
Night
72°F
SE 3 mph
Precip.
9%
9%
24.09
thu
thu
Day
79°F
SE 4 mph
Precip.
12%
12%
Night
72°F
S 2 mph
Precip.
5%
5%
25.09
fri
fri
Day
81°F
N 4 mph
Precip.
10%
10%
Night
73°F
NE 6 mph
Precip.
12%
12%
26.09
sat
sat
Day
68°F
N 12 mph
Precip.
94%
94%
Night
66°F
SE 11 mph
Precip.
75%
75%
27.09
sun
sun
Day
70°F
SW 7 mph
Precip.
4%
4%
Night
63°F
SW 8 mph
Precip.
6%
6%
28.09
mon
mon
Day
68°F
W 8 mph
Precip.
12%
12%
Night
66°F
NW 7 mph
Precip.
14%
14%
29.09
tue
tue
Day
61°F
NW 9 mph
Precip.
75%
75%
Night
59°F
E 4 mph
Precip.
24%
24%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 78.7°F. The highest and lowest sea temperatures during the month were 80.8°F and 76.3°F.
Air temperature in Incheon, °F
Precipitation total in Incheon, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Incheon
Incheon on a weather map
Places in South Korea:
Name
°F
24 Hours Forecast
Incheon
Local time: 13:04
September 16, wednesday
1500
82°F
E
3 mph
3 mph
1800
77°F
E
6 mph
6 mph
2100
75°F
S
2 mph
2 mph
September 17, thursday
0000
72°F
NW
3 mph
3 mph
0300
70°F
W
3 mph
3 mph
0600
68°F
W
3 mph
3 mph
0900
72°F
W
4 mph
4 mph
1200
79°F
W
6 mph
6 mph
