18.12
thu
thu
Day
34°F
NE 4 mph
Precip.
0%
0%
Night
41°F
NE 12 mph
Precip.
0%
0%
19.12
fri
fri
Day
39°F
N 9 mph
Precip.
100%
100%
Night
41°F
NE 9 mph
Precip.
100%
100%
20.12
sat
sat
Day
39°F
NE 7 mph
Precip.
68%
68%
Night
39°F
E 9 mph
Precip.
0%
0%
21.12
sun
sun
Day
36°F
SE 7 mph
Precip.
0%
0%
Night
32°F
SE 5 mph
Precip.
0%
0%
22.12
mon
mon
Day
32°F
W 3 mph
Precip.
0%
0%
Night
25°F
W 7 mph
Precip.
0%
0%
23.12
tue
tue
Day
21°F
W 8 mph
Precip.
0%
0%
Night
18°F
SW 7 mph
Precip.
0%
0%
24.12
wed
wed
Day
18°F
W 7 mph
Precip.
0%
0%
Night
18°F
W 4 mph
Precip.
0%
0%
25.12
thu
thu
Day
19°F
NE 1 mph
Precip.
0%
0%
Night
19°F
NE 4 mph
Precip.
0%
0%
26.12
fri
fri
Day
21°F
E 7 mph
Precip.
0%
0%
Night
23°F
E 7 mph
Precip.
0%
0%
27.12
sat
sat
Day
23°F
E 4 mph
Precip.
0%
0%
Night
23°F
NE 4 mph
Precip.
0%
0%
28.12
sun
sun
Day
23°F
NE 5 mph
Precip.
0%
0%
Night
27°F
SE 6 mph
Precip.
0%
0%
29.12
mon
mon
Day
25°F
SE 8 mph
Precip.
0%
0%
Night
23°F
SE 5 mph
Precip.
0%
0%
30.12
tue
tue
Day
25°F
E 6 mph
Precip.
0%
0%
Night
28°F
SE 9 mph
Precip.
0%
0%
31.12
wed
wed
Day
30°F
SE 11 mph
Precip.
0%
0%
Night
30°F
SE 7 mph
Precip.
100%
100%
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 37.5°F. The highest and lowest sea temperatures during the month were 39.6°F and 36.0°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: 10:17
December 18, thursday
1200
34°F
NE
4 mph
4 mph
1500
32°F
N
5 mph
5 mph
1800
34°F
N
8 mph
8 mph
2100
37°F
N
11 mph
11 mph
December 19, friday
0000
41°F
NE
12 mph
12 mph
0300
41°F
NE
8 mph
8 mph
0600
41°F
NE
8 mph
8 mph
0900
39°F
NE
7 mph
7 mph
