Average sea water temperature in September:
+61.4°F
| Minimum sea water temperature in September: | 70.0°F |
| Maximum sea water temperature in September: | 53.1°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 64.8°F and 55.9°F.
Monthly sea water temperature in Lahti, °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 Lahti
Lahti on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Lahti
Local time: 15:48
October 18, sunday
1800
39°F
S
4 mph
4 mph
2100
37°F
S
4 mph
4 mph
October 19, monday
0000
36°F
SW
2 mph
2 mph
0300
34°F
W
2 mph
2 mph
0600
34°F
N
2 mph
2 mph
0900
34°F
N
3 mph
3 mph
1200
43°F
N
5 mph
5 mph
1500
46°F
N
5 mph
5 mph
