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September weather forecast in Helsinki

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	758 mmHg		81%
	5.2 m/s		+16

31 August, Sunday. day, 17°; night, 10°; overcast

1 September, mon

	759 mmHg		80%
	4.9 m/s		+17

1 September, Monday. day, 17°; night, 9°; partly cloudy

2 September, tue

	759 mmHg		82%
	5 m/s		+16

2 September, Tuesday. day, 16°; night, 9°; rain

3 September, wed

	759 mmHg		84%
	5.3 m/s		+16

3 September, Wednesday. day, 17°; night, 10°; rain

4 September, thu

	759 mmHg		81%
	5.1 m/s		+16

4 September, Thursday. day, 17°; night, 10°; partly cloudy

5 September, fri

	759 mmHg		79%
	4.8 m/s		+16

5 September, Friday. day, 17°; night, 9°; clear

6 September, sat

	759 mmHg		81%
	4.69 m/s		+16

6 September, Saturday. day, 17°; night, 9°; partly cloudy

7 September, sun

	758 mmHg		83%
	4.8 m/s		+16

7 September, Sunday. day, 17°; night, 9°; rain

8 September, mon

	757 mmHg		82%
	5.1 m/s		+16

8 September, Monday. day, 17°; night, 10°; rain

9 September, tue

	758 mmHg		81%
	5.2 m/s		+16

9 September, Tuesday. day, 16°; night, 10°; partly cloudy

10 September, wed

	758 mmHg		82%
	5 m/s		+16

10 September, Wednesday. day, 16°; night, 10°; overcast

11 September, thu

	759 mmHg		83%
	4.5 m/s		+15

11 September, Thursday. day, 16°; night, 10°; partly cloudy

12 September, fri

	757 mmHg		85%
	5.2 m/s		+16

12 September, Friday. day, 16°; night, 10°; rain

13 September, sat

	757 mmHg		82%
	5.4 m/s		+16

13 September, Saturday. day, 15°; night, 9°; clear

14 September, sun

	756 mmHg		82%
	6 m/s		+15

14 September, Sunday. day, 15°; night, 8°; rain

15 September, mon

	756 mmHg		82%
	5.8 m/s		+15

15 September, Monday. day, 14°; night, 7°; rain

16 September, tue

	756 mmHg		81%
	5.2 m/s		+15

16 September, Tuesday. day, 14°; night, 7°; rain

17 September, wed

	757 mmHg		82%
	5 m/s		+15

17 September, Wednesday. day, 14°; night, 7°; overcast

18 September, thu

	758 mmHg		83%
	5.2 m/s		+15

18 September, Thursday. day, 14°; night, 7°; overcast

19 September, fri

	758 mmHg		83%
	5.2 m/s		+15

19 September, Friday. day, 14°; night, 8°; partly cloudy

20 September, sat

	760 mmHg		82%
	5.2 m/s		+14

20 September, Saturday. day, 14°; night, 7°; partly cloudy

21 September, sun

	759 mmHg		84%
	5.3 m/s		+14

21 September, Sunday. day, 14°; night, 7°; overcast

22 September, mon

	758 mmHg		83%
	5.2 m/s		+14

22 September, Monday. day, 14°; night, 7°; partly cloudy

23 September, tue

	756 mmHg		83%
	5.5 m/s		+14

23 September, Tuesday. day, 13°; night, 6°; rain

24 September, wed

	757 mmHg		82%
	5.4 m/s		+14

24 September, Wednesday. day, 13°; night, 7°; clear

25 September, thu

	759 mmHg		83%
	5.1 m/s		+14

25 September, Thursday. day, 13°; night, 6°; clear

26 September, fri

	759 mmHg		84%
	5.2 m/s		+14

26 September, Friday. day, 13°; night, 7°; overcast

27 September, sat

	758 mmHg		83%
	5.7 m/s		+14

27 September, Saturday. day, 13°; night, 7°; partly cloudy

28 September, sun

	757 mmHg		85%
	5.6 m/s		+13

28 September, Sunday. day, 12°; night, 7°; rain

29 September, mon

	757 mmHg		85%
	5.3 m/s		+13

29 September, Monday. day, 12°; night, 6°; overcast

30 September, tue

	757 mmHg		83%
	5.1 m/s		+13

30 September, Tuesday. day, 12°; night, 6°; rain

1 October, wed

	757 mmHg		83%
	5.5 m/s		+13

1 October, Wednesday. day, 11°; night, 5°; partly cloudy

2 October, thu

	756 mmHg		85%
	5 m/s		+13

2 October, Thursday. day, 11°; night, 6°; rain

3 October, fri

	757 mmHg		86%
	5.3 m/s		+13

3 October, Friday. day, 11°; night, 6°; partly cloudy

4 October, sat

	756 mmHg		86%
	5.7 m/s		+13

4 October, Saturday. day, 11°; night, 6°; rain

Average data for 10 years

Helsinki September

4

sunny days

11

days with precipitation

10

cloudy days

4 sunny days; 11 days with precipitation; 10 cloudy days;

83

%

air humidity

3.9

m/s

WindS

61

mm of precipitation

(9% of annual average)

+15

°C

Water temperature

air humidity 83%; 61 millimeters of precipitation (9% of annual average); Wind southerly 3.9 Meters per second; Water temperature +15°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

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S

S

S

SW

SW

S

S

S

S

S

S

S

S

S

S

SW

SW

SW

S

S

S

SW

SW

SW

S

S

S

S

S

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Tallinn
Riga
Vyborg
Gdov
Ust'-Luga
Sovetskiy
Kingisepp
Narva
Yamm

Cities with similar weather in September

Riga
Stockholm
Oslo
Yurmala
Palanga
Dublin
Buenos Aires
Copenhagen
Auckland

The weather forecast for September 2025 is based on historical data from the past 10 years.

In September, the weather in Helsinki is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Helsinki has 11 rainy, 9 partly cloudy, 6 cloudy, and 4 sunny days in September. The rains are usually moderate.

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