16.09
wed
wed
Day
54°F
N 11 mph
Precip.
37%
37%
Night
55°F
N 10 mph
Precip.
72%
72%
17.09
thu
thu
Day
57°F
NE 11 mph
Precip.
23%
23%
Night
48°F
NE 6 mph
Precip.
27%
27%
18.09
fri
fri
Day
52°F
N 8 mph
Precip.
63%
63%
Night
50°F
NE 9 mph
Precip.
33%
33%
19.09
sat
sat
Day
55°F
NE 12 mph
Precip.
21%
21%
Night
54°F
N 11 mph
Precip.
28%
28%
20.09
sun
sun
Day
57°F
NE 11 mph
Precip.
23%
23%
Night
48°F
NE 3 mph
Precip.
39%
39%
21.09
mon
mon
Day
54°F
S 8 mph
Precip.
17%
17%
Night
46°F
W 6 mph
Precip.
36%
36%
22.09
tue
tue
Day
55°F
SW 9 mph
Precip.
20%
20%
Night
54°F
S 11 mph
Precip.
58%
58%
23.09
wed
wed
Day
59°F
S 9 mph
Precip.
24%
24%
Night
52°F
NW 10 mph
Precip.
34%
34%
24.09
thu
thu
Day
54°F
N 4 mph
Precip.
28%
28%
Night
48°F
NE 6 mph
Precip.
68%
68%
25.09
fri
fri
Day
46°F
SE 9 mph
Precip.
35%
35%
Night
43°F
S 9 mph
Precip.
43%
43%
26.09
sat
sat
Day
48°F
S 11 mph
Precip.
32%
32%
Night
43°F
SW 5 mph
Precip.
35%
35%
27.09
sun
sun
Day
48°F
W 6 mph
Precip.
19%
19%
Night
43°F
W 6 mph
Precip.
18%
18%
28.09
mon
mon
Day
50°F
W 9 mph
Precip.
9%
9%
Night
43°F
W 7 mph
Precip.
15%
15%
29.09
tue
tue
Day
46°F
NW 9 mph
Precip.
19%
19%
Night
46°F
W 4 mph
Precip.
38%
38%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 61.4°F. The highest and lowest sea temperatures during the month were 64.8°F and 59.4°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: 21:17
September 17, thursday
0000
55°F
N
10 mph
10 mph
0300
54°F
NE
7 mph
7 mph
0600
54°F
N
7 mph
7 mph
0900
54°F
NE
9 mph
9 mph
1200
57°F
NE
11 mph
11 mph
1500
59°F
NE
10 mph
10 mph
1800
55°F
E
9 mph
9 mph
2100
52°F
NE
6 mph
6 mph
