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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

	755 mmHg		82%
	6.2 m/s		+15

31 August, Sunday. day, 16°; night, 11°; overcast

1 September, mon

	754 mmHg		84%
	6.2 m/s		+15

1 September, Monday. day, 17°; night, 12°; rain

2 September, tue

	753 mmHg		85%
	6.1 m/s		+15

2 September, Tuesday. day, 16°; night, 12°; overcast

3 September, wed

	753 mmHg		83%
	6.4 m/s		+15

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

4 September, thu

	753 mmHg		84%
	6.4 m/s		+15

4 September, Thursday. day, 17°; night, 12°; overcast

5 September, fri

	753 mmHg		85%
	6.6 m/s		+15

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

6 September, sat

	752 mmHg		84%
	6.6 m/s		+15

6 September, Saturday. day, 16°; night, 11°; overcast

7 September, sun

	752 mmHg		85%
	6.4 m/s		+15

7 September, Sunday. day, 16°; night, 12°; overcast

8 September, mon

	751 mmHg		84%
	6.4 m/s		+15

8 September, Monday. day, 16°; night, 11°; rain

9 September, tue

	752 mmHg		83%
	6.8 m/s		+15

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

10 September, wed

	751 mmHg		85%
	6.8 m/s		+15

10 September, Wednesday. day, 16°; night, 11°; rain

11 September, thu

	751 mmHg		85%
	7.2 m/s		+15

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

12 September, fri

	752 mmHg		81%
	7.2 m/s		+15

12 September, Friday. day, 15°; night, 10°; rain

13 September, sat

	752 mmHg		83%
	7.6 m/s		+15

13 September, Saturday. day, 16°; night, 10°; rain

14 September, sun

	754 mmHg		84%
	6.6 m/s		+14

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

15 September, mon

	754 mmHg		84%
	6.7 m/s		+14

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

16 September, tue

	753 mmHg		82%
	6.7 m/s		+14

16 September, Tuesday. day, 15°; night, 10°; partly cloudy

17 September, wed

	753 mmHg		83%
	5.9 m/s		+14

17 September, Wednesday. day, 15°; night, 10°; clear

18 September, thu

	752 mmHg		82%
	6.6 m/s		+14

18 September, Thursday. day, 15°; night, 10°; clear

19 September, fri

	752 mmHg		84%
	6.9 m/s		+14

19 September, Friday. day, 16°; night, 11°; rain

20 September, sat

	752 mmHg		82%
	6.6 m/s		+14

20 September, Saturday. day, 15°; night, 10°; partly cloudy

21 September, sun

	751 mmHg		84%
	7 m/s		+14

21 September, Sunday. day, 15°; night, 10°; partly cloudy

22 September, mon

	752 mmHg		83%
	6.7 m/s		+14

22 September, Monday. day, 15°; night, 10°; overcast

23 September, tue

	751 mmHg		82%
	7.3 m/s		+14

23 September, Tuesday. day, 15°; night, 10°; partly cloudy

24 September, wed

	751 mmHg		83%
	6.7 m/s		+14

24 September, Wednesday. day, 15°; night, 10°; partly cloudy

25 September, thu

	752 mmHg		85%
	7.1 m/s		+14

25 September, Thursday. day, 15°; night, 10°; rain

26 September, fri

	751 mmHg		84%
	7.1 m/s		+14

26 September, Friday. day, 14°; night, 10°; rain

27 September, sat

	751 mmHg		84%
	7.2 m/s		+14

27 September, Saturday. day, 15°; night, 10°; partly cloudy

28 September, sun

	750 mmHg		84%
	7.4 m/s		+14

28 September, Sunday. day, 14°; night, 10°; rain

29 September, mon

	750 mmHg		84%
	7 m/s		+14

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

30 September, tue

	748 mmHg		87%
	7.5 m/s		+14

30 September, Tuesday. day, 14°; night, 10°; rain

1 October, wed

	748 mmHg		84%
	7.9 m/s		+14

1 October, Wednesday. day, 14°; night, 9°; rain

2 October, thu

	749 mmHg		84%
	7.6 m/s		+13

2 October, Thursday. day, 14°; night, 9°; partly cloudy

3 October, fri

	749 mmHg		83%
	8 m/s		+13

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

4 October, sat

	749 mmHg		84%
	8.39 m/s		+13

4 October, Saturday. day, 13°; night, 9°; rain

Average data for 10 years

Westport September

2

sunny days

16

days with precipitation

15

cloudy days

2 sunny days; 16 days with precipitation; 15 cloudy days;

84

%

air humidity

4.9

m/s

WindS

95

mm of precipitation

(8% of annual average)

+14

°C

Water temperature

air humidity 84%; 95 millimeters of precipitation (8% of annual average); Wind southerly 4.9 Meters per second; Water temperature +14°

Weather graphs for September

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

SW

SW

SW

SW

S

S

S

S

SW

SW

W

SW

S

SW

SW

S

S

S

S

S

S

S

S

S

S

S

SW

SW

SW

S

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
Carrickfinn
Cork
Galway
Wicklow
Belfast
Ballyvaughan
Cavan
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 15 degrees above zero. On average, Westport has 16 rainy, 6 cloudy, 6 partly 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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