Average sea water temperature in September:
+58.5°F
| Minimum sea water temperature in September: | 66.7°F |
| Maximum sea water temperature in September: | 50.4°F |
Daily sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 59.1°F. The highest and lowest sea temperatures during the month were 64.0°F and 52.3°F.
Monthly sea water temperature in Porvoo, °F
Which Finland resorts have warmest sea in September?
| Place name | September 2025 | September 2024 |
|---|---|---|
| Kotka | 61.4°F | 64.4°F |
| Lappeenranta | 61.2°F | 64.4°F |
| Lahti | 60.6°F | 62.4°F |
| Turku | 60.5°F | 61.9°F |
| Savolinna | 60.1°F | 62.9°F |
| Vantaa | 59.5°F | 61.9°F |
| Helsinki | 59.5°F | 61.7°F |
| Juvaskyla | 59.5°F | 61.0°F |
| Imatra | 59.4°F | 62.4°F |
| Espoo | 59.3°F | 61.8°F |
| Porvoo | 59.1°F | 61.9°F |
| Koli National Park | 59.1°F | 61.5°F |
| Vaasa | 57.7°F | 58.8°F |
| Pori | 57.3°F | 60.1°F |
| Seinajoki | 56.7°F | 58.0°F |
| Oulu | 56.6°F | 58.0°F |
| Kemi | 56.2°F | 58.2°F |
| Saariselka | 53.1°F | 54.0°F |
Best time for vacation in Porvoo
Porvoo on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Porvoo
Local time: 10:18
July 18, saturday
1200
68°F
N
12 mph
12 mph
1500
70°F
NW
14 mph
14 mph
1800
72°F
NW
19 mph
19 mph
2100
70°F
N
21 mph
21 mph
July 19, sunday
0000
66°F
N
23 mph
23 mph
0300
64°F
N
25 mph
25 mph
0600
63°F
NE
33 mph
33 mph
0900
63°F
E
30 mph
30 mph
