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September weather forecast in Llanelli

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		80%
	6 m/s		+17

31 August, Sunday. day, 17°; night, 12°; partly cloudy

1 September, mon

	761 mmHg		82%
	5.6 m/s		+17

1 September, Monday. day, 17°; night, 12°; partly cloudy

2 September, tue

	760 mmHg		84%
	5.8 m/s		+17

2 September, Tuesday. day, 17°; night, 12°; partly cloudy

3 September, wed

	759 mmHg		84%
	6.5 m/s		+17

3 September, Wednesday. day, 17°; night, 13°; rain

4 September, thu

	760 mmHg		83%
	6.2 m/s		+17

4 September, Thursday. day, 17°; night, 13°; partly cloudy

5 September, fri

	759 mmHg		83%
	6.3 m/s		+17

5 September, Friday. day, 18°; night, 13°; partly cloudy

6 September, sat

	758 mmHg		84%
	6.7 m/s		+17

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

7 September, sun

	758 mmHg		83%
	6.5 m/s		+17

7 September, Sunday. day, 17°; night, 13°; rain

8 September, mon

	758 mmHg		83%
	6.4 m/s		+17

8 September, Monday. day, 17°; night, 13°; overcast

9 September, tue

	758 mmHg		83%
	6.4 m/s		+17

9 September, Tuesday. day, 17°; night, 12°; clear

10 September, wed

	758 mmHg		83%
	6.8 m/s		+17

10 September, Wednesday. day, 17°; night, 12°; partly cloudy

11 September, thu

	758 mmHg		83%
	7 m/s		+17

11 September, Thursday. day, 17°; night, 12°; rain

12 September, fri

	759 mmHg		82%
	6.7 m/s		+17

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

13 September, sat

	759 mmHg		81%
	6.7 m/s		+17

13 September, Saturday. day, 16°; night, 11°; clear

14 September, sun

	759 mmHg		82%
	6.6 m/s		+17

14 September, Sunday. day, 16°; night, 11°; partly cloudy

15 September, mon

	759 mmHg		82%
	6.2 m/s		+16

15 September, Monday. day, 16°; night, 11°; partly cloudy

16 September, tue

	759 mmHg		81%
	6.6 m/s		+16

16 September, Tuesday. day, 16°; night, 12°; clear

17 September, wed

	759 mmHg		80%
	6.4 m/s		+16

17 September, Wednesday. day, 16°; night, 11°; clear

18 September, thu

	758 mmHg		81%
	7.1 m/s		+16

18 September, Thursday. day, 16°; night, 11°; rain

19 September, fri

	759 mmHg		82%
	6.8 m/s		+16

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

20 September, sat

	759 mmHg		83%
	6.6 m/s		+16

20 September, Saturday. day, 16°; night, 12°; partly cloudy

21 September, sun

	759 mmHg		82%
	6.8 m/s		+16

21 September, Sunday. day, 17°; night, 11°; partly cloudy

22 September, mon

	759 mmHg		85%
	6.5 m/s		+16

22 September, Monday. day, 16°; night, 12°; rain

23 September, tue

	758 mmHg		82%
	7.2 m/s		+16

23 September, Tuesday. day, 16°; night, 11°; rain

24 September, wed

	757 mmHg		82%
	6.9 m/s		+16

24 September, Wednesday. day, 15°; night, 11°; rain

25 September, thu

	758 mmHg		84%
	6.3 m/s		+16

25 September, Thursday. day, 15°; night, 11°; rain

26 September, fri

	758 mmHg		85%
	7 m/s		+16

26 September, Friday. day, 15°; night, 11°; rain

27 September, sat

	758 mmHg		83%
	7 m/s		+16

27 September, Saturday. day, 15°; night, 11°; partly cloudy

28 September, sun

	758 mmHg		84%
	7.1 m/s		+16

28 September, Sunday. day, 15°; night, 11°; rain

29 September, mon

	757 mmHg		83%
	7.2 m/s		+16

29 September, Monday. day, 15°; night, 11°; rain

30 September, tue

	755 mmHg		87%
	8 m/s		+16

30 September, Tuesday. day, 15°; night, 12°; rain

1 October, wed

	755 mmHg		84%
	7.9 m/s		+16

1 October, Wednesday. day, 15°; night, 11°; rain

2 October, thu

	756 mmHg		83%
	7.3 m/s		+16

2 October, Thursday. day, 14°; night, 10°; partly cloudy

3 October, fri

	757 mmHg		83%
	7.7 m/s		+16

3 October, Friday. day, 14°; night, 10°; overcast

4 October, sat

	757 mmHg		82%
	8.3 m/s		+16

4 October, Saturday. day, 14°; night, 10°; overcast

Average data for 10 years

Llanelli September

4

sunny days

14

days with precipitation

10

cloudy days

4 sunny days; 14 days with precipitation; 10 cloudy days;

83

%

air humidity

4.9

m/s

WindSW

107

mm of precipitation

(8% of annual average)

+16

°C

Water temperature

air humidity 83%; 107 millimeters of precipitation (8% of annual average); Wind south-westerly 4.9 Meters per second; Water temperature +16°

Weather graphs for September

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

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SW

SW

S

S

SW

SW

SW

SW

S

SW

SW

S

SW

SW

S

S

S

S

S

S

S

S

S

SW

SW

SW

SW

SW

S

1

Average data for 10 years

2

3

4

5

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7

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9

10

11

12

13

14

15

16

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18

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20

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30

Daytime temperature

Night-time temperature

Cities near you

Dublin
Manchester
Liverpool
Trowbridge
Brest
Looe
Bristol
Plymouth
Hereford

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Yurmala
Palanga
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 Llanelli is typically warm. Average daily high temperature in September is about 16 degrees above zero. On average, Llanelli has 14 rainy, 10 partly cloudy, 4 sunny, and 2 cloudy days in September. The rains are usually heavy.

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