16.09
wed
wed
Day
55°F
N 12 mph
Precip.
47%
47%
Night
54°F
N 9 mph
Precip.
26%
26%
17.09
thu
thu
Day
57°F
NE 11 mph
Precip.
17%
17%
Night
50°F
NE 7 mph
Precip.
9%
9%
18.09
fri
fri
Day
55°F
NE 9 mph
Precip.
32%
32%
Night
50°F
N 8 mph
Precip.
32%
32%
19.09
sat
sat
Day
55°F
NE 11 mph
Precip.
26%
26%
Night
54°F
N 12 mph
Precip.
76%
76%
20.09
sun
sun
Day
54°F
NE 11 mph
Precip.
30%
30%
Night
48°F
NE 4 mph
Precip.
38%
38%
21.09
mon
mon
Day
55°F
SE 5 mph
Precip.
8%
8%
Night
48°F
S 14 mph
Precip.
68%
68%
22.09
tue
tue
Day
45°F
S 6 mph
Precip.
46%
46%
Night
50°F
S 7 mph
Precip.
43%
43%
23.09
wed
wed
Day
52°F
S 6 mph
Precip.
38%
38%
Night
50°F
S 9 mph
Precip.
31%
31%
24.09
thu
thu
Day
48°F
S 9 mph
Precip.
75%
75%
Night
46°F
SE 11 mph
Precip.
27%
27%
25.09
fri
fri
Day
46°F
S 12 mph
Precip.
21%
21%
Night
46°F
S 14 mph
Precip.
26%
26%
26.09
sat
sat
Day
46°F
S 9 mph
Precip.
19%
19%
Night
43°F
S 4 mph
Precip.
11%
11%
27.09
sun
sun
Day
46°F
W 4 mph
Precip.
17%
17%
Night
46°F
NW 5 mph
Precip.
21%
21%
28.09
mon
mon
Day
48°F
W 7 mph
Precip.
20%
20%
Night
43°F
W 5 mph
Precip.
29%
29%
29.09
tue
tue
Day
52°F
W 8 mph
Precip.
6%
6%
Night
45°F
W 5 mph
Precip.
20%
20%
sea water
temperature
temperature
| Seinajoki |
monthly
weather
weather
| Seinajoki |
current
weather
weather
| Seinajoki |
7 days
forecast
forecast
| Seinajoki |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 58.9°F. The highest and lowest sea temperatures during the month were 61.0°F and 55.8°F.
Air temperature in Seinajoki, °F
Precipitation total in Seinajoki, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Seinajoki
Seinajoki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Seinajoki
Local time: 20:28
September 16, wednesday
2100
54°F
N
9 mph
9 mph
September 17, thursday
0000
54°F
N
9 mph
9 mph
0300
52°F
N
9 mph
9 mph
0600
52°F
NE
7 mph
7 mph
0900
50°F
NE
9 mph
9 mph
1200
57°F
NE
11 mph
11 mph
1500
54°F
E
9 mph
9 mph
1800
52°F
E
9 mph
9 mph
