Current sea water temperature:
+39.9°F
| Minimum sea water temperature in April: | 45.9°F |
| Maximum sea water temperature in April: | 29.1°F |
| Average sea water temperature in April: | 36.4°F |
| more information | |
14 days
forecast
forecast
| Helsinki |
monthly
weather
weather
| Helsinki |
Sea water temperature for the last 10 days:
| April 28 | 39.9°F | April 23 | 41.4°F |
| April 27 | 39.4°F | April 22 | 41.5°F |
| April 26 | 38.5°F | April 21 | 42.1°F |
| April 25 | 38.3°F | April 20 | 39.4°F |
| April 24 | 40.1°F | April 19 | 39.7°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: 11:34
April 28, tuesday
1200
41°F
S
15 mph
15 mph
1500
45°F
S
14 mph
14 mph
1800
45°F
S
12 mph
12 mph
2100
41°F
S
9 mph
9 mph
April 29, wednesday
0000
37°F
SE
12 mph
12 mph
0300
34°F
S
12 mph
12 mph
0600
32°F
S
12 mph
12 mph
0900
37°F
S
11 mph
11 mph
