27.08
thu
thu
Day
64°F
NW 2 mph
Precip.
12%
12%
Night
57°F
W 2 mph
Precip.
24%
24%
28.08
fri
fri
Day
66°F
NE 6 mph
Precip.
2%
2%
Night
57°F
NW 6 mph
Precip.
26%
26%
29.08
sat
sat
Day
64°F
NW 12 mph
Precip.
15%
15%
Night
57°F
N 12 mph
Precip.
31%
31%
30.08
sun
sun
Day
68°F
NE 13 mph
Precip.
5%
5%
Night
55°F
N 5 mph
Precip.
43%
43%
31.08
mon
mon
Day
59°F
N 6 mph
Precip.
48%
48%
Night
57°F
N 4 mph
Precip.
29%
29%
01.09
tue
tue
Day
57°F
SW 6 mph
Precip.
63%
63%
Night
54°F
S 5 mph
Precip.
43%
43%
02.09
wed
wed
Day
63°F
S 4 mph
Precip.
8%
8%
Night
55°F
SE 3 mph
Precip.
40%
40%
sea water
temperature
temperature
| Seinajoki |
monthly
weather
weather
| Seinajoki |
current
weather
weather
| Seinajoki |
14 days
forecast
forecast
| Seinajoki |
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 60.5°F. The highest and lowest sea temperatures during the month were 62.2°F and 58.1°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 56.7°F. The highest and lowest sea temperatures during the month were 61.9°F and 51.6°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: 16:19
August 27, thursday
1800
68°F
SW
1 mph
1 mph
2100
59°F
W
3 mph
3 mph
August 28, friday
0000
57°F
W
2 mph
2 mph
0300
55°F
NE
3 mph
3 mph
0600
54°F
NE
4 mph
4 mph
0900
57°F
N
4 mph
4 mph
1200
66°F
NE
6 mph
6 mph
1500
68°F
N
8 mph
8 mph
