16.09
wed
wed
Day
57°F
N 17 mph
Precip.
25%
25%
Night
61°F
N 22 mph
Precip.
33%
33%
17.09
thu
thu
Day
57°F
NE 22 mph
Precip.
36%
36%
Night
55°F
E 12 mph
Precip.
35%
35%
18.09
fri
fri
Day
57°F
NE 20 mph
Precip.
35%
35%
Night
57°F
NE 23 mph
Precip.
36%
36%
19.09
sat
sat
Day
57°F
NE 22 mph
Precip.
25%
25%
Night
59°F
NE 25 mph
Precip.
31%
31%
20.09
sun
sun
Day
57°F
NE 24 mph
Precip.
27%
27%
Night
54°F
E 9 mph
Precip.
41%
41%
21.09
mon
mon
Day
54°F
S 9 mph
Precip.
21%
21%
Night
55°F
NW 15 mph
Precip.
20%
20%
22.09
tue
tue
Day
55°F
W 16 mph
Precip.
23%
23%
Night
54°F
SE 8 mph
Precip.
78%
78%
23.09
wed
wed
Day
59°F
SW 17 mph
Precip.
27%
27%
Night
54°F
NW 20 mph
Precip.
26%
26%
24.09
thu
thu
Day
54°F
NW 6 mph
Precip.
21%
21%
Night
54°F
E 12 mph
Precip.
22%
22%
25.09
fri
fri
Day
50°F
SE 14 mph
Precip.
38%
38%
Night
46°F
SE 14 mph
Precip.
33%
33%
26.09
sat
sat
Day
52°F
SW 17 mph
Precip.
33%
33%
Night
48°F
SW 10 mph
Precip.
35%
35%
27.09
sun
sun
Day
52°F
W 11 mph
Precip.
6%
6%
Night
50°F
W 17 mph
Precip.
21%
21%
28.09
mon
mon
Day
52°F
W 22 mph
Precip.
22%
22%
Night
52°F
W 19 mph
Precip.
10%
10%
29.09
tue
tue
Day
52°F
W 20 mph
Precip.
18%
18%
Night
55°F
W 15 mph
Precip.
22%
22%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 61.0°F. The highest and lowest sea temperatures during the month were 62.6°F and 59.7°F.
Air temperature in Kotka, °F
Precipitation total in Kotka, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Kotka
Kotka on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Kotka
Local time: 21:18
September 17, thursday
0000
61°F
N
22 mph
22 mph
0300
59°F
NE
19 mph
19 mph
0600
59°F
NE
16 mph
16 mph
0900
57°F
NE
19 mph
19 mph
1200
57°F
NE
22 mph
22 mph
1500
59°F
NE
24 mph
24 mph
1800
57°F
NE
24 mph
24 mph
2100
57°F
NE
17 mph
17 mph
