Average sea water temperature in September:
+56.6°F
| Minimum sea water temperature in September: | 64.6°F |
| Maximum sea water temperature in September: | 32.0°F |
Daily sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 57.9°F. The highest and lowest sea temperatures during the month were 61.2°F and 55.0°F.
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| Koli National Park |
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| Koli National Park |
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| Koli National Park |
14 days
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| Koli National Park |
Monthly sea water temperature in Koli National Park, °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 Koli National Park
Koli National Park on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Koli National Park
Local time: 04:28
October 12, monday
0600
34°F
W
11 mph
11 mph
0900
36°F
W
13 mph
13 mph
1200
39°F
W
14 mph
14 mph
1500
41°F
W
13 mph
13 mph
1800
37°F
W
14 mph
14 mph
2100
36°F
SW
14 mph
14 mph
October 13, tuesday
0000
34°F
SW
14 mph
14 mph
0300
34°F
SW
14 mph
14 mph
