18.05
mon
mon
Day
54°F
SW 3 mph
Precip.
0%
0%
Night
54°F
SW 12 mph
Precip.
100%
100%
19.05
tue
tue
Day
54°F
W 14 mph
Precip.
83%
83%
Night
52°F
N 9 mph
Precip.
0%
0%
20.05
wed
wed
Day
46°F
NE 11 mph
Precip.
0%
0%
Night
50°F
E 6 mph
Precip.
0%
0%
21.05
thu
thu
Day
52°F
NE 9 mph
Precip.
0%
0%
Night
48°F
E 6 mph
Precip.
0%
0%
22.05
fri
fri
Day
50°F
NE 14 mph
Precip.
0%
0%
Night
52°F
SE 13 mph
Precip.
0%
0%
23.05
sat
sat
Day
59°F
SE 9 mph
Precip.
0%
0%
Night
52°F
NE 9 mph
Precip.
0%
0%
24.05
sun
sun
Day
52°F
E 16 mph
Precip.
69%
69%
Night
52°F
E 11 mph
Precip.
0%
0%
25.05
mon
mon
Day
48°F
S 19 mph
Precip.
0%
0%
Night
46°F
S 12 mph
Precip.
0%
0%
26.05
tue
tue
Day
55°F
SW 7 mph
Precip.
0%
0%
Night
50°F
SE 6 mph
Precip.
0%
0%
27.05
wed
wed
Day
52°F
NE 7 mph
Precip.
0%
0%
Night
50°F
NW 2 mph
Precip.
0%
0%
28.05
thu
thu
Day
48°F
N 13 mph
Precip.
0%
0%
Night
48°F
E 13 mph
Precip.
0%
0%
29.05
fri
fri
Day
48°F
NE 12 mph
Precip.
0%
0%
Night
48°F
NE 11 mph
Precip.
0%
0%
30.05
sat
sat
Day
50°F
N 9 mph
Precip.
0%
0%
Night
52°F
W 13 mph
Precip.
0%
0%
31.05
sun
sun
Day
50°F
N 14 mph
Precip.
62%
62%
Night
50°F
N 8 mph
Precip.
0%
0%
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 42.9°F. The highest and lowest sea temperatures during the month were 47.3°F and 38.1°F.
Sea water temperature in June, °F
Show year:
2025
2024
2023
The average sea water temperature in June of 2025 was 55.3°F. The highest and lowest sea temperatures during the month were 58.5°F and 51.6°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: 17:24
May 18, monday
1800
57°F
SW
9 mph
9 mph
2100
55°F
S
12 mph
12 mph
May 19, tuesday
0000
54°F
SW
12 mph
12 mph
0300
52°F
SW
9 mph
9 mph
0600
52°F
SW
11 mph
11 mph
0900
52°F
W
12 mph
12 mph
1200
54°F
W
14 mph
14 mph
1500
54°F
W
11 mph
11 mph
