Measurements:
°C
°F
CURRENT WEATHER
01:40
Helsinki
54°F
N 9 mph
Feels like: 50°F
Precip: 29%
World Resorts Finland Helsinki Weather

7 Day Weather Forecast

09.29
tue
DAY
56°F
N 9 mph
precip
33%
NIGHT
58°F
S 3 mph
precip
35%
09.30
wed
DAY
58°F
SW 6 mph
precip
5%
NIGHT
50°F
W 5 mph
precip
26%
10.01
thu
DAY
58°F
NW 6 mph
precip
9%
NIGHT
54°F
N 3 mph
precip
14%
10.02
fri
DAY
60°F
NE 7 mph
precip
10%
NIGHT
54°F
N 8 mph
precip
13%
10.03
sat
DAY
58°F
NE 11 mph
precip
23%
NIGHT
54°F
NE 7 mph
precip
21%
10.04
sun
DAY
56°F
NE 11 mph
precip
21%
NIGHT
52°F
NE 8 mph
precip
16%
10.05
mon
DAY
58°F
NE 9 mph
precip
6%
NIGHT
50°F
NE 4 mph
precip
13%

Helsinki Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Helsinki was 14.5°F. The maximum and minimum values were 12.5°F and 16.0°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