18.05
mon
mon
Day
61°F
NE 6 mph
Precip.
0%
0%
Night
50°F
S 6 mph
Precip.
0%
0%
19.05
tue
tue
Day
52°F
SW 7 mph
Precip.
100%
100%
Night
57°F
W 6 mph
Precip.
100%
100%
20.05
wed
wed
Day
54°F
N 9 mph
Precip.
0%
0%
Night
50°F
N 9 mph
Precip.
0%
0%
21.05
thu
thu
Day
63°F
NE 11 mph
Precip.
100%
100%
Night
54°F
N 7 mph
Precip.
100%
100%
22.05
fri
fri
Day
52°F
NE 8 mph
Precip.
0%
0%
Night
46°F
SE 5 mph
Precip.
0%
0%
23.05
sat
sat
Day
64°F
E 5 mph
Precip.
0%
0%
Night
54°F
N 11 mph
Precip.
85%
85%
24.05
sun
sun
Day
59°F
SE 12 mph
Precip.
77%
77%
Night
54°F
S 11 mph
Precip.
0%
0%
25.05
mon
mon
Day
54°F
S 12 mph
Precip.
0%
0%
Night
43°F
S 4 mph
Precip.
0%
0%
26.05
tue
tue
Day
63°F
N 4 mph
Precip.
0%
0%
Night
50°F
N 4 mph
Precip.
0%
0%
27.05
wed
wed
Day
66°F
N 11 mph
Precip.
0%
0%
Night
54°F
N 9 mph
Precip.
0%
0%
28.05
thu
thu
Day
48°F
NE 5 mph
Precip.
100%
100%
Night
46°F
E 4 mph
Precip.
0%
0%
29.05
fri
fri
Day
57°F
W 2 mph
Precip.
74%
74%
Night
48°F
E 5 mph
Precip.
100%
100%
30.05
sat
sat
Day
61°F
N 6 mph
Precip.
0%
0%
Night
52°F
SW 4 mph
Precip.
0%
0%
31.05
sun
sun
Day
52°F
W 9 mph
Precip.
100%
100%
Night
52°F
N 3 mph
Precip.
100%
100%
sea water
temperature
temperature
| Seinajoki |
monthly
weather
weather
| Seinajoki |
current
weather
weather
| Seinajoki |
7 days
forecast
forecast
| Seinajoki |
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 43.9°F. The highest and lowest sea temperatures during the month were 46.6°F and 41.2°F.
Sea water temperature in June, °F
Show year:
2025
2024
2023
The average sea water temperature in June of 2025 was 53.7°F. The highest and lowest sea temperatures during the month were 58.3°F and 47.1°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: 17:23
May 18, monday
1800
64°F
S
1 mph
1 mph
2100
57°F
S
4 mph
4 mph
May 19, tuesday
0000
50°F
S
6 mph
6 mph
0300
48°F
SW
4 mph
4 mph
0600
52°F
W
6 mph
6 mph
0900
50°F
SW
9 mph
9 mph
1200
52°F
SW
7 mph
7 mph
1500
55°F
SW
7 mph
7 mph
