Measurements:
°C
°F
CURRENT WEATHER
23:22
Helsinki
60°F
NE 12 mph
Feels like: 60°F
Precip: 29%
World Resorts Finland Helsinki Weather

7 Day Weather Forecast

09.08
tue
DAY
60°F
NE 14 mph
precip
29%
NIGHT
60°F
NE 12 mph
precip
29%
09.09
wed
DAY
60°F
NE 6 mph
precip
26%
NIGHT
62°F
NE 12 mph
precip
39%
09.10
thu
DAY
58°F
NE 19 mph
precip
45%
NIGHT
52°F
E 14 mph
precip
25%
09.11
fri
DAY
60°F
E 12 mph
precip
5%
NIGHT
56°F
NE 8 mph
precip
30%
09.12
sat
DAY
62°F
NE 16 mph
precip
46%
NIGHT
54°F
E 4 mph
precip
30%
09.13
sun
DAY
62°F
NE 12 mph
precip
19%
NIGHT
58°F
NE 10 mph
precip
26%
09.14
mon
DAY
60°F
S 6 mph
precip
24%
NIGHT
48°F
SE 6 mph
precip
24%

Helsinki Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Helsinki was 15.3°F. The maximum and minimum values were 12.2°F and 17.4°F respectively.

Helsinki on the Weather Map

Best Time to Visit Helsinki
The most sunny months:
July 15 days
June 14 days
May 14 days
The most warm months:
July 70.6 °F
August 68.9 °F
June 64.7 °F
Warmest sea temperature:
August 64.4 °F
July 63.3 °F
September 59.8 °F
The most cold months:
January 25.5 °F
February 26.1 °F
December 31.9 °F
The most rainy months:
August 5 days
July 4 days
October 4 days
The most windy months:
December 12 mph
November 12 mph
January 11 mph
more details