Average sea water temperature in September:
+55.9°F
| Minimum sea water temperature in September: | 63.7°F |
| Maximum sea water temperature in September: | 48.0°F |
Daily sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 56.8°F. The highest and lowest sea temperatures during the month were 61.0°F and 52.9°F.
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Monthly sea water temperature in Seinajoki, °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 Seinajoki
Seinajoki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Seinajoki
Local time: 22:54
October 07, wednesday
0000
48°F
E
13 mph
13 mph
0300
46°F
E
11 mph
11 mph
0600
46°F
E
11 mph
11 mph
0900
45°F
E
9 mph
9 mph
1200
50°F
E
11 mph
11 mph
1500
52°F
E
9 mph
9 mph
1800
46°F
E
8 mph
8 mph
2100
43°F
NE
6 mph
6 mph
