Average sea water temperature in September:
+59.4°F
| Minimum sea water temperature in September: | 67.5°F |
| Maximum sea water temperature in September: | 51.3°F |
Daily sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 59.8°F. The highest and lowest sea temperatures during the month were 62.6°F and 57.2°F.
Monthly sea water temperature in Kotka, °F
Which Finland resorts have warmest sea in September?
| Place name | September 2026 | September 2025 |
|---|---|---|
| Kotka | 59.8°F | 61.4°F |
| Lahti | 59.8°F | 60.6°F |
| Lappeenranta | 59.2°F | 61.2°F |
| Turku | 59.2°F | 60.5°F |
| Juvaskyla | 58.6°F | 59.5°F |
| Savolinna | 58.6°F | 60.1°F |
| Imatra | 58.2°F | 59.4°F |
| Vantaa | 58.1°F | 59.5°F |
| Helsinki | 58.0°F | 59.5°F |
| Koli National Park | 57.9°F | 59.1°F |
| Pori | 57.6°F | 57.3°F |
| Porvoo | 57.5°F | 59.1°F |
| Vaasa | 57.5°F | 57.7°F |
| Espoo | 57.5°F | 59.3°F |
| Seinajoki | 56.8°F | 56.7°F |
| Oulu | 55.1°F | 56.6°F |
| Kemi | 54.6°F | 56.2°F |
| Saariselka | 52.4°F | 53.1°F |
Best time for vacation in Kotka
Kotka on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Kotka
Local time: 09:14
October 05, monday
1200
54°F
NE
13 mph
13 mph
1500
54°F
E
11 mph
11 mph
1800
55°F
NE
15 mph
15 mph
2100
55°F
NE
22 mph
22 mph
October 06, tuesday
0000
55°F
NE
26 mph
26 mph
0300
57°F
NE
29 mph
29 mph
0600
57°F
E
27 mph
27 mph
0900
57°F
E
22 mph
22 mph
