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September weather forecast in Westport

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

	757 mmHg		85%
	6 m/s		+15

31 August, Sunday. day, 14°; night, 12°; clear

1 September, mon

	754 mmHg		87%
	6.5 m/s		+15

1 September, Monday. day, 14°; night, 13°; rain

2 September, tue

	753 mmHg		85%
	5.3 m/s		+15

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

3 September, wed

	751 mmHg		87%
	6.1 m/s		+15

3 September, Wednesday. day, 15°; night, 12°; rain

4 September, thu

	753 mmHg		83%
	6.1 m/s		+15

4 September, Thursday. day, 14°; night, 12°; rain

5 September, fri

	753 mmHg		83%
	6.5 m/s		+15

5 September, Friday. day, 14°; night, 12°; clear

6 September, sat

	753 mmHg		87%
	6.8 m/s		+15

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

7 September, sun

	752 mmHg		86%
	5.9 m/s		+15

7 September, Sunday. day, 14°; night, 12°; rain

8 September, mon

	753 mmHg		87%
	6.5 m/s		+15

8 September, Monday. day, 14°; night, 13°; rain

9 September, tue

	749 mmHg		86%
	7.9 m/s		+15

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

10 September, wed

	751 mmHg		87%
	6.9 m/s		+15

10 September, Wednesday. day, 14°; night, 13°; rain

11 September, thu

	751 mmHg		86%
	9 m/s		+15

11 September, Thursday. day, 14°; night, 12°; rain

12 September, fri

	753 mmHg		81%
	6.1 m/s		+15

12 September, Friday. day, 14°; night, 12°; rain

13 September, sat

	755 mmHg		85%
	5.9 m/s		+15

13 September, Saturday. day, 14°; night, 12°; rain

14 September, sun

	754 mmHg		86%
	6.1 m/s		+14

14 September, Sunday. day, 14°; night, 11°; rain

15 September, mon

	753 mmHg		86%
	4.9 m/s		+14

15 September, Monday. day, 13°; night, 10°; rain

16 September, tue

	753 mmHg		86%
	5.5 m/s		+14

16 September, Tuesday. day, 13°; night, 11°; rain

17 September, wed

	755 mmHg		86%
	5.8 m/s		+14

17 September, Wednesday. day, 13°; night, 11°; overcast

18 September, thu

	754 mmHg		87%
	6.9 m/s		+14

18 September, Thursday. day, 14°; night, 12°; rain

19 September, fri

	757 mmHg		87%
	5.5 m/s		+14

19 September, Friday. day, 13°; night, 12°; rain

20 September, sat

	755 mmHg		87%
	7.3 m/s		+14

20 September, Saturday. day, 14°; night, 12°; rain

21 September, sun

	756 mmHg		86%
	5.8 m/s		+14

21 September, Sunday. day, 13°; night, 11°; rain

22 September, mon

	755 mmHg		85%
	7.6 m/s		+14

22 September, Monday. day, 14°; night, 11°; rain

23 September, tue

	755 mmHg		85%
	6.3 m/s		+14

23 September, Tuesday. day, 13°; night, 12°; rain

24 September, wed

	754 mmHg		87%
	5.5 m/s		+14

24 September, Wednesday. day, 13°; night, 11°; overcast

25 September, thu

	756 mmHg		85%
	6.3 m/s		+14

25 September, Thursday. day, 13°; night, 12°; rain

26 September, fri

	757 mmHg		87%
	6.1 m/s		+14

26 September, Friday. day, 14°; night, 12°; overcast

27 September, sat

	756 mmHg		87%
	7.5 m/s		+14

27 September, Saturday. day, 15°; night, 12°; rain

28 September, sun

	756 mmHg		87%
	7.1 m/s		+14

28 September, Sunday. day, 14°; night, 12°; clear

29 September, mon

	754 mmHg		87%
	7.5 m/s		+14

29 September, Monday. day, 14°; night, 12°; rain

30 September, tue

	752 mmHg		83%
	6.5 m/s		+14

30 September, Tuesday. day, 13°; night, 11°; rain

1 October, wed

	751 mmHg		85%
	8.3 m/s		+14

1 October, Wednesday. day, 13°; night, 11°; rain

2 October, thu

	750 mmHg		83%
	7.3 m/s		+13

2 October, Thursday. day, 12°; night, 10°; rain

3 October, fri

	750 mmHg		83%
	7.6 m/s		+13

3 October, Friday. day, 12°; night, 11°; rain

4 October, sat

	748 mmHg		87%
	8.1 m/s		+13

4 October, Saturday. day, 13°; night, 11°; rain

Average data for 10 years

Westport September

2

sunny days

25

days with precipitation

3

cloudy days

2 sunny days; 25 days with precipitation; 3 cloudy days;

85

%

air humidity

5.5

m/s

WindSW

108

mm of precipitation

(8% of annual average)

+14

°C

Water temperature

air humidity 85%; 108 millimeters of precipitation (8% of annual average); Wind south-westerly 5.5 Meters per second; Water temperature +14°

Weather graphs for September

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

S

SW

SW

W

W

W

SW

S

SW

SW

SW

W

W

NW

W

NW

SW

SW

SW

SW

SW

SW

SW

SW

S

S

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

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Dublin
Wicklow
Carrickfinn
Cork
Ennis
Belfast
Ballyvaughan
Antrim
Tralee

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Oslo
Yurmala
Palanga
Buenos Aires
Copenhagen

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

In September, the weather in Westport is typically warm. Average daily high temperature in September is about 14 degrees above zero. On average, Westport has 25 rainy, 3 cloudy, and 2 sunny days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Westport.

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