13.09
sun
sun
Day
61°F
E 7 mph
Precip.
19%
19%
Night
50°F
SE 8 mph
Precip.
17%
17%
14.09
mon
mon
Day
57°F
S 7 mph
Precip.
3%
3%
Night
50°F
SE 2 mph
Precip.
23%
23%
15.09
tue
tue
Day
59°F
NW 6 mph
Precip.
4%
4%
Night
55°F
N 8 mph
Precip.
24%
24%
16.09
wed
wed
Day
57°F
N 12 mph
Precip.
50%
50%
Night
59°F
N 14 mph
Precip.
31%
31%
17.09
thu
thu
Day
59°F
NE 13 mph
Precip.
27%
27%
Night
52°F
NE 7 mph
Precip.
14%
14%
18.09
fri
fri
Day
59°F
NE 13 mph
Precip.
21%
21%
Night
55°F
NE 12 mph
Precip.
77%
77%
19.09
sat
sat
Day
59°F
SE 8 mph
Precip.
7%
7%
Night
52°F
NE 6 mph
Precip.
16%
16%
20.09
sun
sun
Day
54°F
N 18 mph
Precip.
88%
88%
Night
50°F
E 12 mph
Precip.
8%
8%
21.09
mon
mon
Day
57°F
E 8 mph
Precip.
15%
15%
Night
50°F
SE 6 mph
Precip.
31%
31%
22.09
tue
tue
Day
54°F
SE 12 mph
Precip.
10%
10%
Night
46°F
E 9 mph
Precip.
23%
23%
23.09
wed
wed
Day
54°F
SE 13 mph
Precip.
3%
3%
Night
45°F
SE 10 mph
Precip.
9%
9%
24.09
thu
thu
Day
52°F
SE 10 mph
Precip.
4%
4%
Night
45°F
SE 5 mph
Precip.
22%
22%
25.09
fri
fri
Day
55°F
NE 12 mph
Precip.
8%
8%
Night
55°F
SE 9 mph
Precip.
18%
18%
26.09
sat
sat
Day
55°F
S 9 mph
Precip.
3%
3%
Night
48°F
SE 5 mph
Precip.
22%
22%
sea water
temperature
temperature
| Helsinki |
monthly
weather
weather
| Helsinki |
current
weather
weather
| Helsinki |
7 days
forecast
forecast
| Helsinki |
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.
Air temperature in Helsinki, °F
Precipitation total in Helsinki, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 15:54
September 13, sunday
1800
59°F
E
6 mph
6 mph
2100
54°F
SE
6 mph
6 mph
September 14, monday
0000
50°F
SE
8 mph
8 mph
0300
48°F
S
7 mph
7 mph
0600
45°F
S
6 mph
6 mph
0900
48°F
S
7 mph
7 mph
1200
57°F
S
7 mph
7 mph
1500
61°F
S
5 mph
5 mph
