17.12
wed
wed
Day
41°F
NE 14 mph
Precip.
0%
0%
Night
39°F
E 15 mph
Precip.
0%
0%
18.12
thu
thu
Day
37°F
NE 6 mph
Precip.
0%
0%
Night
41°F
NE 16 mph
Precip.
85%
85%
19.12
fri
fri
Day
41°F
NE 12 mph
Precip.
61%
61%
Night
41°F
NE 18 mph
Precip.
100%
100%
20.12
sat
sat
Day
41°F
NE 19 mph
Precip.
63%
63%
Night
39°F
E 14 mph
Precip.
0%
0%
21.12
sun
sun
Day
39°F
E 11 mph
Precip.
0%
0%
Night
36°F
E 9 mph
Precip.
0%
0%
22.12
mon
mon
Day
36°F
E 6 mph
Precip.
0%
0%
Night
37°F
N 9 mph
Precip.
100%
100%
23.12
tue
tue
Day
34°F
S 12 mph
Precip.
100%
100%
Night
27°F
S 14 mph
Precip.
80%
80%
24.12
wed
wed
Day
21°F
S 13 mph
Precip.
79%
79%
Night
16°F
S 9 mph
Precip.
0%
0%
25.12
thu
thu
Day
16°F
S 9 mph
Precip.
0%
0%
Night
14°F
NW 9 mph
Precip.
0%
0%
26.12
fri
fri
Day
16°F
S 8 mph
Precip.
0%
0%
Night
16°F
SE 6 mph
Precip.
0%
0%
27.12
sat
sat
Day
30°F
SE 12 mph
Precip.
100%
100%
Night
28°F
S 16 mph
Precip.
0%
0%
28.12
sun
sun
Day
25°F
S 11 mph
Precip.
0%
0%
Night
23°F
SE 14 mph
Precip.
0%
0%
29.12
mon
mon
Day
19°F
S 11 mph
Precip.
0%
0%
Night
16°F
S 9 mph
Precip.
0%
0%
30.12
tue
tue
Day
16°F
SW 5 mph
Precip.
0%
0%
Night
16°F
SW 7 mph
Precip.
0%
0%
sea water
temperature
temperature
| Helsinki |
monthly
weather
weather
| Helsinki |
current
weather
weather
| Helsinki |
7 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.
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: 16:49
December 17, wednesday
1800
43°F
NE
20 mph
20 mph
2100
43°F
E
19 mph
19 mph
December 18, thursday
0000
39°F
E
15 mph
15 mph
0300
39°F
E
14 mph
14 mph
0600
37°F
E
8 mph
8 mph
0900
36°F
E
7 mph
7 mph
1200
37°F
NE
6 mph
6 mph
1500
37°F
NE
8 mph
8 mph
