Average sea water temperature in May:
+39.3°F
| Minimum sea water temperature in May: | 57.2°F |
| Maximum sea water temperature in May: | 29.8°F |
Daily sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 39.6°F. The highest and lowest sea temperatures during the month were 43.0°F and 36.7°F.
Monthly sea water temperature in Oulu, °F
Which Finland resorts have warmest sea in May?
| Place name | May 2026 | May 2025 |
|---|---|---|
| Lahti | 46.0°F | 47.5°F |
| Porvoo | 45.4°F | 47.1°F |
| Lappeenranta | 45.0°F | 46.3°F |
| Espoo | 44.3°F | 46.2°F |
| Vaasa | 44.2°F | 47.1°F |
| Helsinki | 44.1°F | 46.3°F |
| Seinajoki | 43.9°F | 45.2°F |
| Vantaa | 43.9°F | 46.0°F |
| Turku | 43.2°F | 45.7°F |
| Kotka | 42.9°F | 45.7°F |
| Pori | 42.6°F | 46.9°F |
| Juvaskyla | 41.9°F | 43.8°F |
| Savolinna | 41.8°F | 43.1°F |
| Imatra | 40.8°F | 43.1°F |
| Oulu | 39.6°F | 39.1°F |
| Saariselka | 36.7°F | 38.1°F |
| Kemi | 34.4°F | 37.6°F |
| Koli National Park | 34.0°F | 39.1°F |
Best time for vacation in Oulu
Oulu on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Oulu
Local time: 18:56
May 18, monday
2100
45°F
S
3 mph
3 mph
May 19, tuesday
0000
45°F
W
3 mph
3 mph
0300
46°F
W
6 mph
6 mph
0600
48°F
W
6 mph
6 mph
0900
54°F
SW
7 mph
7 mph
1200
57°F
NW
9 mph
9 mph
1500
52°F
SW
12 mph
12 mph
1800
50°F
W
13 mph
13 mph
