16.09
wed
wed
Day
57°F
N 19 mph
Precip.
25%
25%
Night
59°F
NE 24 mph
Precip.
40%
40%
17.09
thu
thu
Day
59°F
NE 23 mph
Precip.
30%
30%
Night
55°F
E 12 mph
Precip.
36%
36%
18.09
fri
fri
Day
57°F
NE 25 mph
Precip.
52%
52%
Night
57°F
NE 24 mph
Precip.
43%
43%
19.09
sat
sat
Day
57°F
NE 24 mph
Precip.
23%
23%
Night
59°F
NE 26 mph
Precip.
31%
31%
20.09
sun
sun
Day
57°F
NE 23 mph
Precip.
25%
25%
Night
55°F
NE 9 mph
Precip.
48%
48%
21.09
mon
mon
Day
54°F
S 12 mph
Precip.
22%
22%
Night
55°F
W 16 mph
Precip.
23%
23%
22.09
tue
tue
Day
55°F
W 23 mph
Precip.
23%
23%
Night
54°F
E 12 mph
Precip.
71%
71%
23.09
wed
wed
Day
57°F
S 16 mph
Precip.
23%
23%
Night
54°F
NW 24 mph
Precip.
32%
32%
24.09
thu
thu
Day
54°F
NW 6 mph
Precip.
24%
24%
Night
54°F
E 12 mph
Precip.
24%
24%
25.09
fri
fri
Day
50°F
SE 17 mph
Precip.
28%
28%
Night
48°F
S 15 mph
Precip.
43%
43%
26.09
sat
sat
Day
52°F
S 16 mph
Precip.
42%
42%
Night
50°F
SW 13 mph
Precip.
22%
22%
27.09
sun
sun
Day
52°F
W 17 mph
Precip.
22%
22%
Night
54°F
W 22 mph
Precip.
20%
20%
28.09
mon
mon
Day
54°F
W 27 mph
Precip.
10%
10%
Night
55°F
W 22 mph
Precip.
14%
14%
29.09
tue
tue
Day
52°F
W 20 mph
Precip.
16%
16%
Night
55°F
NW 14 mph
Precip.
23%
23%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 58.7°F. The highest and lowest sea temperatures during the month were 60.3°F and 56.3°F.
Air temperature in Porvoo, °F
Precipitation total in Porvoo, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Porvoo
Porvoo on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Porvoo
Local time: 20:30
September 16, wednesday
2100
61°F
N
21 mph
21 mph
September 17, thursday
0000
59°F
NE
24 mph
24 mph
0300
59°F
NE
17 mph
17 mph
0600
59°F
NE
18 mph
18 mph
0900
57°F
NE
21 mph
21 mph
1200
59°F
NE
23 mph
23 mph
1500
59°F
NE
24 mph
24 mph
1800
57°F
NE
23 mph
23 mph
