18.12
thu
thu
Day
37°F
NE 7 mph
Precip.
0%
0%
Night
43°F
NE 19 mph
Precip.
0%
0%
19.12
fri
fri
Day
43°F
NE 14 mph
Precip.
0%
0%
Night
43°F
NE 14 mph
Precip.
100%
100%
20.12
sat
sat
Day
41°F
E 14 mph
Precip.
82%
82%
Night
39°F
E 12 mph
Precip.
0%
0%
21.12
sun
sun
Day
37°F
SE 11 mph
Precip.
0%
0%
Night
34°F
SE 7 mph
Precip.
0%
0%
22.12
mon
mon
Day
36°F
W 4 mph
Precip.
0%
0%
Night
34°F
W 14 mph
Precip.
0%
0%
23.12
tue
tue
Day
28°F
W 16 mph
Precip.
0%
0%
Night
25°F
W 17 mph
Precip.
0%
0%
24.12
wed
wed
Day
27°F
W 17 mph
Precip.
0%
0%
Night
27°F
W 11 mph
Precip.
0%
0%
sea water
temperature
temperature
| Helsinki |
monthly
weather
weather
| Helsinki |
current
weather
weather
| Helsinki |
14 days
forecast
forecast
| Helsinki |
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 40.2°F. The highest and lowest sea temperatures during the month were 41.9°F and 36.7°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 34.9°F. The highest and lowest sea temperatures during the month were 36.9°F and 33.6°F.
Air temperature in Helsinki, °F
Precipitation total in Helsinki, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 07:39
December 18, thursday
0900
36°F
NE
6 mph
6 mph
1200
37°F
NE
7 mph
7 mph
1500
39°F
NE
9 mph
9 mph
1800
39°F
N
13 mph
13 mph
2100
41°F
NE
17 mph
17 mph
December 19, friday
0000
43°F
NE
19 mph
19 mph
0300
43°F
NE
14 mph
14 mph
0600
41°F
NE
13 mph
13 mph
