21.12
sun
sun
Day
39°F
SE 9 mph
Precip.
0%
0%
Night
34°F
SE 7 mph
Precip.
0%
0%
22.12
mon
mon
Day
34°F
SW 7 mph
Precip.
0%
0%
Night
27°F
SW 11 mph
Precip.
0%
0%
23.12
tue
tue
Day
25°F
SW 9 mph
Precip.
67%
67%
Night
23°F
SW 2 mph
Precip.
85%
85%
24.12
wed
wed
Day
25°F
E 12 mph
Precip.
0%
0%
Night
30°F
SE 10 mph
Precip.
0%
0%
25.12
thu
thu
Day
30°F
SW 3 mph
Precip.
29%
29%
Night
34°F
SE 7 mph
Precip.
52%
52%
26.12
fri
fri
Day
36°F
SE 9 mph
Precip.
100%
100%
Night
34°F
SW 4 mph
Precip.
79%
79%
27.12
sat
sat
Day
34°F
E 9 mph
Precip.
100%
100%
Night
32°F
S 16 mph
Precip.
100%
100%
28.12
sun
sun
Day
30°F
SW 12 mph
Precip.
100%
100%
Night
27°F
SE 5 mph
Precip.
0%
0%
29.12
mon
mon
Day
32°F
E 17 mph
Precip.
0%
0%
Night
36°F
SE 16 mph
Precip.
0%
0%
30.12
tue
tue
Day
28°F
S 13 mph
Precip.
0%
0%
Night
25°F
S 9 mph
Precip.
0%
0%
31.12
wed
wed
Day
23°F
SE 9 mph
Precip.
29%
29%
Night
19°F
S 9 mph
Precip.
0%
0%
01.01
thu
thu
Day
19°F
SW 9 mph
Precip.
79%
79%
Night
16°F
NW 5 mph
Precip.
41%
41%
02.01
fri
fri
Day
19°F
N 2 mph
Precip.
0%
0%
Night
18°F
W 2 mph
Precip.
0%
0%
03.01
sat
sat
Day
32°F
NE 18 mph
Precip.
100%
100%
Night
32°F
SE 13 mph
Precip.
100%
100%
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 39.9°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: 02:28
December 21, sunday
0300
41°F
E
11 mph
11 mph
0600
41°F
E
11 mph
11 mph
0900
39°F
SE
11 mph
11 mph
1200
39°F
SE
9 mph
9 mph
1500
37°F
SE
9 mph
9 mph
1800
36°F
SE
8 mph
8 mph
2100
34°F
SE
7 mph
7 mph
December 22, monday
0000
34°F
SE
7 mph
7 mph
