Average sea water temperature in May:
+40.8°F
| Minimum sea water temperature in May: | 55.2°F |
| Maximum sea water temperature in May: | 31.3°F |
Daily sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 43.8°F. The highest and lowest sea temperatures during the month were 46.6°F and 41.2°F.
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Monthly sea water temperature in Seinajoki, °F
Which Finland resorts have warmest sea in May?
| Place name | May 2026 | May 2025 |
|---|---|---|
| Lahti | 45.8°F | 47.5°F |
| Porvoo | 45.2°F | 47.1°F |
| Lappeenranta | 44.7°F | 46.3°F |
| Espoo | 44.1°F | 46.2°F |
| Helsinki | 43.9°F | 46.3°F |
| Vaasa | 43.9°F | 47.1°F |
| Seinajoki | 43.8°F | 45.2°F |
| Vantaa | 43.7°F | 46.0°F |
| Turku | 43.0°F | 45.7°F |
| Kotka | 42.7°F | 45.7°F |
| Pori | 42.2°F | 46.9°F |
| Juvaskyla | 41.7°F | 43.8°F |
| Savolinna | 41.5°F | 43.1°F |
| Imatra | 40.5°F | 43.1°F |
| Oulu | 39.6°F | 39.1°F |
| Saariselka | 36.6°F | 38.1°F |
| Kemi | 34.3°F | 37.6°F |
| Koli National Park | 33.6°F | 39.1°F |
Best time for vacation in Seinajoki
Seinajoki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Seinajoki
Local time: 22:12
May 18, monday
0000
45°F
N
6 mph
6 mph
0300
43°F
N
6 mph
6 mph
0600
43°F
N
5 mph
5 mph
0900
55°F
NE
6 mph
6 mph
1200
61°F
NE
5 mph
5 mph
1500
66°F
NE
3 mph
3 mph
1800
64°F
W
2 mph
2 mph
2100
57°F
S
4 mph
4 mph
