21.12
sun
sun
Day
36°F
SE 6 mph
Precip.
0%
0%
Night
30°F
SE 4 mph
Precip.
0%
0%
22.12
mon
mon
Day
28°F
SW 6 mph
Precip.
0%
0%
Night
23°F
SW 6 mph
Precip.
0%
0%
23.12
tue
tue
Day
19°F
SW 4 mph
Precip.
0%
0%
Night
18°F
NE 3 mph
Precip.
0%
0%
24.12
wed
wed
Day
23°F
E 9 mph
Precip.
0%
0%
Night
28°F
SE 6 mph
Precip.
74%
74%
25.12
thu
thu
Day
28°F
NW 2 mph
Precip.
100%
100%
Night
30°F
SE 5 mph
Precip.
80%
80%
26.12
fri
fri
Day
34°F
S 7 mph
Precip.
100%
100%
Night
32°F
W 2 mph
Precip.
73%
73%
27.12
sat
sat
Day
30°F
E 6 mph
Precip.
100%
100%
Night
28°F
S 11 mph
Precip.
100%
100%
28.12
sun
sun
Day
27°F
S 8 mph
Precip.
62%
62%
Night
25°F
SE 4 mph
Precip.
58%
58%
29.12
mon
mon
Day
27°F
NE 11 mph
Precip.
74%
74%
Night
32°F
SE 11 mph
Precip.
52%
52%
30.12
tue
tue
Day
25°F
S 9 mph
Precip.
0%
0%
Night
21°F
SE 7 mph
Precip.
0%
0%
31.12
wed
wed
Day
19°F
SE 6 mph
Precip.
0%
0%
Night
16°F
S 6 mph
Precip.
29%
29%
01.01
thu
thu
Day
16°F
S 6 mph
Precip.
82%
82%
Night
10°F
S 3 mph
Precip.
0%
0%
02.01
fri
fri
Day
12°F
E 1 mph
Precip.
0%
0%
Night
9°F
W 1 mph
Precip.
0%
0%
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 37.4°F. The highest and lowest sea temperatures during the month were 39.6°F and 35.8°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 33.1°F. The highest and lowest sea temperatures during the month were 34.0°F and 32.4°F.
Air temperature in Lahti, °F
Precipitation total in Lahti, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Lahti
Lahti on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Lahti
Local time: 02:19
December 21, sunday
0300
39°F
E
7 mph
7 mph
0600
39°F
SE
7 mph
7 mph
0900
37°F
SE
9 mph
9 mph
1200
36°F
SE
6 mph
6 mph
1500
34°F
SE
6 mph
6 mph
1800
32°F
E
4 mph
4 mph
2100
32°F
SE
4 mph
4 mph
December 22, monday
0000
30°F
SE
4 mph
4 mph
