10 day forecast Monthly forecast Weather map

City or area

Go to comparison

September weather forecast in Swansea

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

	738 mmHg		72%
	6.2 m/s		+12

31 August, Sunday. day, 13°; night, 6°; clear

1 September, mon

	740 mmHg		74%
	5.6 m/s		+12

1 September, Monday. day, 13°; night, 5°; clear

2 September, tue

	740 mmHg		72%
	5.5 m/s		+12

2 September, Tuesday. day, 13°; night, 6°; partly cloudy

3 September, wed

	740 mmHg		72%
	5.7 m/s		+12

3 September, Wednesday. day, 13°; night, 6°; clear

4 September, thu

	738 mmHg		73%
	6 m/s		+12

4 September, Thursday. day, 13°; night, 6°; rain

5 September, fri

	739 mmHg		72%
	5.9 m/s		+12

5 September, Friday. day, 13°; night, 6°; partly cloudy

6 September, sat

	739 mmHg		72%
	6 m/s		+12

6 September, Saturday. day, 13°; night, 6°; clear

7 September, sun

	739 mmHg		72%
	5.6 m/s		+12

7 September, Sunday. day, 13°; night, 6°; rain

8 September, mon

	738 mmHg		72%
	6.2 m/s		+12

8 September, Monday. day, 13°; night, 7°; partly cloudy

9 September, tue

	739 mmHg		73%
	5.8 m/s		+12

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

10 September, wed

	739 mmHg		74%
	5.3 m/s		+12

10 September, Wednesday. day, 13°; night, 6°; partly cloudy

11 September, thu

	739 mmHg		73%
	6.3 m/s		+13

11 September, Thursday. day, 13°; night, 6°; rain

12 September, fri

	739 mmHg		74%
	5.5 m/s		+12

12 September, Friday. day, 13°; night, 6°; partly cloudy

13 September, sat

	738 mmHg		69%
	6 m/s		+12

13 September, Saturday. day, 14°; night, 7°; clear

14 September, sun

	737 mmHg		68%
	6.3 m/s		+12

14 September, Sunday. day, 14°; night, 6°; clear

15 September, mon

	736 mmHg		69%
	6.6 m/s		+12

15 September, Monday. day, 14°; night, 6°; rain

16 September, tue

	737 mmHg		70%
	6.8 m/s		+12

16 September, Tuesday. day, 13°; night, 6°; partly cloudy

17 September, wed

	738 mmHg		71%
	6.3 m/s		+12

17 September, Wednesday. day, 13°; night, 7°; partly cloudy

18 September, thu

	737 mmHg		71%
	6.3 m/s		+13

18 September, Thursday. day, 14°; night, 7°; partly cloudy

19 September, fri

	736 mmHg		71%
	7.1 m/s		+13

19 September, Friday. day, 15°; night, 7°; partly cloudy

20 September, sat

	738 mmHg		70%
	6 m/s		+13

20 September, Saturday. day, 14°; night, 7°; clear

21 September, sun

	738 mmHg		69%
	6.5 m/s		+12

21 September, Sunday. day, 15°; night, 7°; clear

22 September, mon

	738 mmHg		71%
	6.3 m/s		+13

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

23 September, tue

	738 mmHg		73%
	6 m/s		+13

23 September, Tuesday. day, 14°; night, 6°; rain

24 September, wed

	738 mmHg		72%
	5.8 m/s		+13

24 September, Wednesday. day, 13°; night, 6°; rain

25 September, thu

	740 mmHg		69%
	5.7 m/s		+13

25 September, Thursday. day, 13°; night, 5°; clear

26 September, fri

	740 mmHg		71%
	5.6 m/s		+13

26 September, Friday. day, 14°; night, 6°; clear

27 September, sat

	738 mmHg		71%
	6.3 m/s		+12

27 September, Saturday. day, 15°; night, 6°; rain

28 September, sun

	737 mmHg		69%
	6.6 m/s		+12

28 September, Sunday. day, 14°; night, 7°; rain

29 September, mon

	737 mmHg		69%
	6.8 m/s		+12

29 September, Monday. day, 14°; night, 7°; overcast

30 September, tue

	737 mmHg		70%
	6 m/s		+13

30 September, Tuesday. day, 15°; night, 7°; partly cloudy

1 October, wed

	738 mmHg		69%
	5.9 m/s		+13

1 October, Wednesday. day, 15°; night, 7°; clear

2 October, thu

	738 mmHg		70%
	6 m/s		+13

2 October, Thursday. day, 16°; night, 8°; partly cloudy

3 October, fri

	739 mmHg		69%
	6.5 m/s		+13

3 October, Friday. day, 15°; night, 7°; clear

4 October, sat

	739 mmHg		69%
	6 m/s		+13

4 October, Saturday. day, 15°; night, 7°; partly cloudy

Average data for 10 years

Swansea September

9

sunny days

10

days with precipitation

5

cloudy days

9 sunny days; 10 days with precipitation; 5 cloudy days;

71

%

air humidity

4

m/s

WindSW

53

mm of precipitation

(9% of annual average)

+12

°C

Water temperature

air humidity 71%; 53 millimeters of precipitation (9% of annual average); Wind south-westerly 4 Meters per second; Water temperature +12°

Weather graphs for September

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

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

W

W

SW

SW

W

W

SW

W

W

W

W

SW

SW

SW

SW

SW

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

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Melbourne
Hobart
Apollo Bay
Burnie
Bairnsdale
Launceston
Colac
Cowes
Devonport

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Cholpon-Ata
Oslo
Yurmala
Palanga
Dublin

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

September in Swansea is the windiest month of the year. In September, the weather in Swansea is typically warm. Average daily high temperature in September is about 14 degrees above zero. On average, Swansea has 10 rainy, 10 partly cloudy, 9 sunny, and 1 cloudy day in September. The rains are usually moderate. September as well as May, June, July, and August is considered the most uncomfortable time to visit Swansea.

Links

Help Terms of use Contact us

For partners

Advertisement Yandex.Weather API

Weather forecasts

Hourly forecast Detailed 10 day forecast Monthly forecast Weather map Magnetic storms

Download app

English

English
Русский

Source data: Yandex.Traffic, Roshydromet FSBI "CAO", NOAA, © OpenStreetMap

© 2017–2025 YANDEX LLC