Average sea water temperature in May:
+45.0°F
| Minimum sea water temperature in May: | 59.5°F |
| Maximum sea water temperature in May: | 37.2°F |
Daily sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 46.3°F. The highest and lowest sea temperatures during the month were 51.1°F and 41.5°F.
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| Helsinki |
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| Helsinki |
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| Helsinki |
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| Helsinki |
Monthly sea water temperature in Helsinki, °F
Which Finland resorts have warmest sea in May?
| Place name | May 2026 | May 2025 |
|---|---|---|
| Lahti | 49.7°F | 47.5°F |
| Porvoo | 48.9°F | 47.1°F |
| Lappeenranta | 48.4°F | 46.3°F |
| Vaasa | 48.0°F | 47.1°F |
| Pori | 47.2°F | 46.9°F |
| Seinajoki | 46.5°F | 45.2°F |
| Helsinki | 46.3°F | 46.3°F |
| Espoo | 46.2°F | 46.2°F |
| Turku | 46.0°F | 45.7°F |
| Juvaskyla | 46.0°F | 43.8°F |
| Vantaa | 45.9°F | 46.0°F |
| Kotka | 45.5°F | 45.7°F |
| Savolinna | 45.5°F | 43.1°F |
| Imatra | 44.7°F | 43.1°F |
| Oulu | 41.1°F | 39.1°F |
| Kemi | 38.5°F | 37.6°F |
| Koli National Park | 38.5°F | 39.1°F |
| Saariselka | 38.0°F | 38.1°F |
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 06:06
October 27, tuesday
0900
50°F
NE
15 mph
15 mph
1200
52°F
NE
16 mph
16 mph
1500
52°F
NE
15 mph
15 mph
1800
52°F
NE
16 mph
16 mph
2100
52°F
NE
17 mph
17 mph
October 28, wednesday
0000
52°F
NE
15 mph
15 mph
0300
50°F
NE
14 mph
14 mph
0600
50°F
N
13 mph
13 mph
