Current sea water temperature:
+48.0°F
| Minimum sea water temperature in May: | 59.5°F |
| Maximum sea water temperature in May: | 37.2°F |
| Average sea water temperature in May: | 44.9°F |
| more information | |
14 days
forecast
forecast
| Helsinki |
monthly
weather
weather
| Helsinki |
Sea water temperature for the last 10 days:
| May 18 | 48.0°F | May 13 | 44.4°F |
| May 17 | 46.8°F | May 12 | 44.8°F |
| May 16 | 45.7°F | May 11 | 44.1°F |
| May 15 | 46.2°F | May 10 | 44.8°F |
| May 14 | 43.3°F | May 9 | 44.2°F |
Monthly sea water temperature, °F
When is the warmest sea in Helsinki?
Based on the data about daily sea water temperature for the last three years the warmest sea in Helsinki was noticed in August, July and September.
Monthly Sea Temperatures in Helsinki, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 63.8°F. The highest and lowest sea temperatures during the month were 73.9°F and 56.5°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 63.2°F. The highest and lowest sea temperatures during the month were 74.5°F and 54.0°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 59.5°F. The highest and lowest sea temperatures during the month were 63.3°F and 54.0°F.
current
weather
weather
| Helsinki |
weather in
May
May
| Helsinki |
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 16:38
May 18, monday
1800
57°F
W
5 mph
5 mph
2100
52°F
SW
4 mph
4 mph
May 19, tuesday
0000
50°F
S
10 mph
10 mph
0300
50°F
SW
16 mph
16 mph
0600
50°F
SW
11 mph
11 mph
0900
54°F
W
12 mph
12 mph
1200
54°F
W
11 mph
11 mph
1500
57°F
W
7 mph
7 mph
