26.12
fri
fri
Day
36°F
S 11 mph
Precip.
0%
0%
Night
34°F
E 6 mph
Precip.
0%
0%
27.12
sat
sat
Day
36°F
SE 21 mph
Precip.
0%
0%
Night
30°F
S 27 mph
Precip.
0%
0%
28.12
sun
sun
Day
30°F
S 21 mph
Precip.
0%
0%
Night
28°F
SE 9 mph
Precip.
0%
0%
29.12
mon
mon
Day
36°F
E 12 mph
Precip.
100%
100%
Night
28°F
SE 11 mph
Precip.
21%
21%
30.12
tue
tue
Day
27°F
NE 11 mph
Precip.
100%
100%
Night
25°F
NW 16 mph
Precip.
43%
43%
31.12
wed
wed
Day
23°F
S 14 mph
Precip.
55%
55%
Night
23°F
SW 15 mph
Precip.
79%
79%
01.01
thu
thu
Day
19°F
SW 12 mph
Precip.
0%
0%
Night
18°F
SW 10 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 39.8°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: 00:58
December 26, friday
0300
39°F
S
16 mph
16 mph
0600
37°F
S
16 mph
16 mph
0900
36°F
S
14 mph
14 mph
1200
36°F
S
11 mph
11 mph
1500
34°F
S
12 mph
12 mph
1800
34°F
S
9 mph
9 mph
2100
32°F
SE
6 mph
6 mph
December 27, saturday
0000
34°F
E
6 mph
6 mph
