Measurements:
°C
°F
CURRENT WEATHER
23:22
Porvoo
62°F
NE 18 mph
Feels like: 62°F
Precip: 25%
World Resorts Finland Porvoo Weather

7 Day Weather Forecast

09.08
tue
DAY
62°F
NE 22 mph
precip
26%
NIGHT
62°F
NE 18 mph
precip
25%
09.09
wed
DAY
62°F
NE 14 mph
precip
48%
NIGHT
64°F
N 20 mph
precip
73%
09.10
thu
DAY
58°F
NE 29 mph
precip
27%
NIGHT
56°F
E 26 mph
precip
20%
09.11
fri
DAY
60°F
E 21 mph
precip
6%
NIGHT
58°F
NE 19 mph
precip
40%
09.12
sat
DAY
60°F
NE 25 mph
precip
38%
NIGHT
58°F
E 11 mph
precip
28%
09.13
sun
DAY
60°F
NE 21 mph
precip
40%
NIGHT
60°F
NE 17 mph
precip
26%
09.14
mon
DAY
58°F
SE 8 mph
precip
48%
NIGHT
54°F
SE 11 mph
precip
20%

Porvoo Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Porvoo was 15.1°F. The maximum and minimum values were 11.3°F and 17.8°F respectively.

Porvoo on the Weather Map

Best Time to Visit Porvoo
The most sunny months:
June 15 days
July 14 days
May 13 days
The most warm months:
July 67.9 °F
August 67.4 °F
June 60.9 °F
Warmest sea temperature:
August 65.0 °F
July 64.5 °F
September 59.5 °F
The most cold months:
February 24.8 °F
January 25.0 °F
March 31.4 °F
The most rainy months:
August 4 days
October 4 days
September 4 days
The most windy months:
December 14 mph
October 14 mph
November 14 mph
more details