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September weather forecast in St Peter Port

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

	764 mmHg		80%
	8.3 m/s		+17

31 August, Sunday. day, 17°; night, 16°; clear

1 September, mon

	765 mmHg		81%
	8.1 m/s		+17

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

2 September, tue

	764 mmHg		83%
	8 m/s		+17

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

3 September, wed

	763 mmHg		84%
	8.6 m/s		+17

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

4 September, thu

	763 mmHg		83%
	8.2 m/s		+17

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

5 September, fri

	763 mmHg		83%
	8.6 m/s		+17

5 September, Friday. day, 17°; night, 16°; clear

6 September, sat

	762 mmHg		83%
	9 m/s		+17

6 September, Saturday. day, 17°; night, 16°; partly cloudy

7 September, sun

	762 mmHg		83%
	8.8 m/s		+17

7 September, Sunday. day, 17°; night, 16°; partly cloudy

8 September, mon

	762 mmHg		83%
	8.89 m/s		+17

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

9 September, tue

	762 mmHg		82%
	9 m/s		+17

9 September, Tuesday. day, 17°; night, 16°; partly cloudy

10 September, wed

	762 mmHg		83%
	9.3 m/s		+17

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

11 September, thu

	762 mmHg		81%
	9.1 m/s		+17

11 September, Thursday. day, 17°; night, 16°; overcast

12 September, fri

	763 mmHg		80%
	9.3 m/s		+17

12 September, Friday. day, 17°; night, 16°; overcast

13 September, sat

	763 mmHg		79%
	9.3 m/s		+17

13 September, Saturday. day, 16°; night, 15°; partly cloudy

14 September, sun

	763 mmHg		79%
	9.1 m/s		+17

14 September, Sunday. day, 16°; night, 15°; clear

15 September, mon

	763 mmHg		78%
	8.89 m/s		+17

15 September, Monday. day, 16°; night, 15°; partly cloudy

16 September, tue

	762 mmHg		79%
	9.1 m/s		+17

16 September, Tuesday. day, 16°; night, 15°; partly cloudy

17 September, wed

	762 mmHg		79%
	9.5 m/s		+17

17 September, Wednesday. day, 16°; night, 15°; partly cloudy

18 September, thu

	762 mmHg		79%
	10 m/s		+17

18 September, Thursday. day, 16°; night, 15°; rain

19 September, fri

	763 mmHg		80%
	9.39 m/s		+17

19 September, Friday. day, 16°; night, 15°; partly cloudy

20 September, sat

	763 mmHg		80%
	8.8 m/s		+17

20 September, Saturday. day, 17°; night, 15°; clear

21 September, sun

	763 mmHg		79%
	8.5 m/s		+17

21 September, Sunday. day, 16°; night, 15°; clear

22 September, mon

	762 mmHg		80%
	8.89 m/s		+17

22 September, Monday. day, 16°; night, 15°; rain

23 September, tue

	762 mmHg		79%
	9.2 m/s		+17

23 September, Tuesday. day, 17°; night, 15°; rain

24 September, wed

	761 mmHg		79%
	9.8 m/s		+17

24 September, Wednesday. day, 16°; night, 15°; rain

25 September, thu

	762 mmHg		78%
	9 m/s		+17

25 September, Thursday. day, 16°; night, 15°; rain

26 September, fri

	762 mmHg		80%
	9.89 m/s		+17

26 September, Friday. day, 16°; night, 15°; rain

27 September, sat

	762 mmHg		81%
	10.5 m/s		+17

27 September, Saturday. day, 16°; night, 15°; rain

28 September, sun

	763 mmHg		80%
	9.5 m/s		+17

28 September, Sunday. day, 16°; night, 15°; rain

29 September, mon

	762 mmHg		79%
	9.7 m/s		+17

29 September, Monday. day, 16°; night, 15°; rain

30 September, tue

	760 mmHg		81%
	10.4 m/s		+17

30 September, Tuesday. day, 16°; night, 15°; rain

1 October, wed

	759 mmHg		82%
	11.1 m/s		+17

1 October, Wednesday. day, 16°; night, 15°; rain

2 October, thu

	760 mmHg		80%
	10.1 m/s		+17

2 October, Thursday. day, 16°; night, 14°; rain

3 October, fri

	761 mmHg		79%
	10.1 m/s		+17

3 October, Friday. day, 15°; night, 14°; partly cloudy

4 October, sat

	762 mmHg		76%
	10.6 m/s		+17

4 October, Saturday. day, 15°; night, 14°; partly cloudy

Average data for 10 years

St Peter Port September

7

sunny days

10

days with precipitation

6

cloudy days

7 sunny days; 10 days with precipitation; 6 cloudy days;

81

%

air humidity

7

m/s

WindS

60

mm of precipitation

(7% of annual average)

+17

°C

Water temperature

air humidity 81%; 60 millimeters of precipitation (7% of annual average); Wind southerly 7 Meters per second; Water temperature +17°

Weather graphs for September

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

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S

S

S

S

S

S

S

S

S

SW

SW

S

S

S

S

S

S

S

S

S

S

S

S

SW

SW

S

SW

SW

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

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29

30

Daytime temperature

Night-time temperature

Cities near you

London
Liverpool
Brest
Trowbridge
Le Havre
Looe
Nantes
Rouen
Brighton

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Yurmala
Palanga
Dublin
Buenos Aires
Copenhagen

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

In September, the weather in St Peter Port is typically warm. Average daily high temperature in September is about 16 degrees above zero. On average, St Peter Port has 11 partly cloudy, 10 rainy, 7 sunny, and 2 cloudy days in September. The rains are usually moderate.

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