Current sea water temperature:
+41.5°F
| Minimum sea water temperature in December: | 43.5°F |
| Maximum sea water temperature in December: | 33.3°F |
| Average sea water temperature in December: | 38.7°F |
| more information | |
14 days
forecast
forecast
| Helsinki |
monthly
weather
weather
| Helsinki |
Sea water temperature for the last 10 days:
| December 4 | 41.5°F | November 29 | 42.1°F |
| December 3 | 41.9°F | November 28 | 42.3°F |
| December 2 | 41.0°F | November 27 | 42.6°F |
| December 1 | 41.5°F | November 26 | 42.6°F |
| November 30 | 41.9°F | November 25 | 42.1°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:
2025
2024
2023
The average sea water temperature in August of 2025 was 63.8°F. The highest and lowest sea temperatures during the month were 73.9°F and 56.5°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 63.2°F. The highest and lowest sea temperatures during the month were 74.5°F and 54.0°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 59.5°F. The highest and lowest sea temperatures during the month were 63.3°F and 54.0°F.
current
weather
weather
| Helsinki |
weather in
December
December
| Helsinki |
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 08:47
December 05, friday
0900
39°F
N
7 mph
7 mph
1200
39°F
N
6 mph
6 mph
1500
39°F
N
5 mph
5 mph
1800
39°F
NW
6 mph
6 mph
2100
41°F
NW
6 mph
6 mph
December 06, saturday
0000
41°F
NW
6 mph
6 mph
0300
41°F
NW
7 mph
7 mph
0600
39°F
W
9 mph
9 mph
