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September weather forecast in Saint Helier

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

	761 mmHg		72%
	8.6 m/s		+18

31 August, Sunday. day, 18°; night, 17°; clear

1 September, mon

	761 mmHg		75%
	8.3 m/s		+18

1 September, Monday. day, 18°; night, 17°; partly cloudy

2 September, tue

	759 mmHg		76%
	9.5 m/s		+18

2 September, Tuesday. day, 18°; night, 17°; overcast

3 September, wed

	758 mmHg		75%
	8.8 m/s		+18

3 September, Wednesday. day, 19°; night, 17°; partly cloudy

4 September, thu

	759 mmHg		76%
	9.3 m/s		+18

4 September, Thursday. day, 18°; night, 17°; overcast

5 September, fri

	758 mmHg		75%
	9.6 m/s		+18

5 September, Friday. day, 18°; night, 17°; clear

6 September, sat

	759 mmHg		74%
	8.8 m/s		+18

6 September, Saturday. day, 18°; night, 16°; overcast

7 September, sun

	758 mmHg		74%
	9.3 m/s		+18

7 September, Sunday. day, 19°; night, 16°; rain

8 September, mon

	758 mmHg		75%
	9.3 m/s		+18

8 September, Monday. day, 19°; night, 17°; clear

9 September, tue

	758 mmHg		73%
	9.6 m/s		+18

9 September, Tuesday. day, 19°; night, 18°; partly cloudy

10 September, wed

	758 mmHg		75%
	10.8 m/s		+18

10 September, Wednesday. day, 18°; night, 17°; rain

11 September, thu

	759 mmHg		74%
	10.3 m/s		+18

11 September, Thursday. day, 18°; night, 17°; partly cloudy

12 September, fri

	759 mmHg		75%
	10.6 m/s		+18

12 September, Friday. day, 18°; night, 16°; rain

13 September, sat

	758 mmHg		73%
	10.8 m/s		+18

13 September, Saturday. day, 17°; night, 16°; rain

14 September, sun

	757 mmHg		74%
	11 m/s		+18

14 September, Sunday. day, 17°; night, 16°; rain

15 September, mon

	755 mmHg		74%
	10.1 m/s		+18

15 September, Monday. day, 17°; night, 16°; clear

16 September, tue

	756 mmHg		73%
	10.6 m/s		+18

16 September, Tuesday. day, 17°; night, 16°; clear

17 September, wed

	757 mmHg		74%
	10.1 m/s		+17

17 September, Wednesday. day, 17°; night, 16°; partly cloudy

18 September, thu

	760 mmHg		75%
	9 m/s		+17

18 September, Thursday. day, 17°; night, 16°; clear

19 September, fri

	762 mmHg		74%
	7.6 m/s		+18

19 September, Friday. day, 17°; night, 16°; partly cloudy

20 September, sat

	762 mmHg		74%
	7.4 m/s		+18

20 September, Saturday. day, 17°; night, 16°; rain

21 September, sun

	761 mmHg		69%
	7.4 m/s		+18

21 September, Sunday. day, 17°; night, 16°; rain

22 September, mon

	761 mmHg		73%
	7.3 m/s		+17

22 September, Monday. day, 17°; night, 16°; partly cloudy

23 September, tue

	759 mmHg		77%
	8.3 m/s		+17

23 September, Tuesday. day, 17°; night, 16°; rain

24 September, wed

	759 mmHg		73%
	8.8 m/s		+17

24 September, Wednesday. day, 17°; night, 16°; clear

25 September, thu

	761 mmHg		74%
	8.8 m/s		+17

25 September, Thursday. day, 17°; night, 16°; partly cloudy

26 September, fri

	761 mmHg		74%
	8.8 m/s		+17

26 September, Friday. day, 18°; night, 16°; partly cloudy

27 September, sat

	762 mmHg		75%
	8.8 m/s		+17

27 September, Saturday. day, 19°; night, 17°; rain

28 September, sun

	761 mmHg		75%
	8 m/s		+17

28 September, Sunday. day, 18°; night, 17°; clear

29 September, mon

	761 mmHg		73%
	8 m/s		+17

29 September, Monday. day, 17°; night, 16°; clear

30 September, tue

	759 mmHg		76%
	10.3 m/s		+17

30 September, Tuesday. day, 18°; night, 16°; clear

1 October, wed

	758 mmHg		75%
	9.8 m/s		+17

1 October, Wednesday. day, 17°; night, 16°; rain

2 October, thu

	757 mmHg		74%
	10.6 m/s		+17

2 October, Thursday. day, 17°; night, 16°; rain

3 October, fri

	758 mmHg		75%
	11.6 m/s		+17

3 October, Friday. day, 16°; night, 16°; clear

4 October, sat

	758 mmHg		76%
	11.1 m/s		+17

4 October, Saturday. day, 17°; night, 15°; overcast

Average data for 10 years

Saint Helier September

9

sunny days

9

days with precipitation

12

cloudy days

9 sunny days; 9 days with precipitation; 12 cloudy days;

74

%

air humidity

7.3

m/s

WindW

57

mm of precipitation

(8% of annual average)

+18

°C

Water temperature

air humidity 74%; 57 millimeters of precipitation (8% of annual average); Wind westerly 7.3 Meters per second; Water temperature +18°

Weather graphs for September

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

NW

W

W

W

SW

W

W

NW

SE

SW

W

W

NW

NW

NW

NW

NW

NW

NW

W

NW

NE

N

NW

W

E

E

SW

W

SW

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

London
Brest
Oxford
Trowbridge
Rouen
Le Havre
Bournemouth
Birmingham
Carnac

Cities with similar weather in September

Riga
Stockholm
Sydney
Yurmala
Palanga
Dublin
Buenos Aires
Copenhagen
Vancouver

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

In September, the weather in Saint Helier is typically warm. Average daily high temperature in September is about 18 degrees above zero. On average, Saint Helier has 9 rainy, 9 sunny, 9 partly cloudy, and 3 cloudy days in September. The rains are usually moderate.

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