Current sea water temperature:
+57.7°F
| Minimum sea water temperature in September: | 65.8°F |
| Maximum sea water temperature in September: | 50.7°F |
| Average sea water temperature in September: | 58.8°F |
| more information | |
14 days
forecast
forecast
| Helsinki |
monthly
weather
weather
| Helsinki |
Sea water temperature for the last 10 days:
| September 16 | 57.7°F | September 11 | 58.8°F |
| September 15 | 57.6°F | September 10 | 59.2°F |
| September 14 | 56.8°F | September 9 | 59.4°F |
| September 13 | 58.6°F | September 8 | 59.7°F |
| September 12 | 59.0°F | September 7 | 59.7°F |
Monthly sea water temperature, °F
When is the warmest sea in Helsinki?
Based on the data about daily sea water temperature for the last three years the warmest sea in Helsinki was noticed in August, July and September.
Monthly Sea Temperatures in Helsinki, °F
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 60.2°F. The highest and lowest sea temperatures during the month were 65.1°F and 56.3°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 62.6°F. The highest and lowest sea temperatures during the month were 66.9°F and 58.5°F.
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 59.3°F. The highest and lowest sea temperatures during the month were 60.8°F and 56.8°F.
current
weather
weather
| Helsinki |
weather in
September
September
| Helsinki |
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 19:50
September 16, wednesday
2100
59°F
N
14 mph
14 mph
September 17, thursday
0000
57°F
NE
9 mph
9 mph
0300
55°F
NE
9 mph
9 mph
0600
55°F
NE
11 mph
11 mph
0900
55°F
NE
10 mph
10 mph
1200
59°F
NE
14 mph
14 mph
1500
59°F
NE
14 mph
14 mph
1800
57°F
E
11 mph
11 mph
