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September weather forecast in Belfast

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

	751 mmHg		83%
	5.3 m/s		+14

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

1 September, mon

	751 mmHg		84%
	5.4 m/s		+15

1 September, Monday. day, 17°; night, 11°; overcast

2 September, tue

	750 mmHg		85%
	5.2 m/s		+15

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

3 September, wed

	749 mmHg		85%
	5.6 m/s		+14

3 September, Wednesday. day, 16°; night, 12°; overcast

4 September, thu

	750 mmHg		84%
	5.6 m/s		+14

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

5 September, fri

	750 mmHg		84%
	5.9 m/s		+14

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

6 September, sat

	749 mmHg		84%
	6 m/s		+14

6 September, Saturday. day, 16°; night, 12°; rain

7 September, sun

	748 mmHg		85%
	5.9 m/s		+15

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

8 September, mon

	748 mmHg		84%
	5.8 m/s		+15

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

9 September, tue

	749 mmHg		84%
	6.1 m/s		+15

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

10 September, wed

	748 mmHg		85%
	5.7 m/s		+14

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

11 September, thu

	747 mmHg		85%
	6.3 m/s		+14

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

12 September, fri

	748 mmHg		84%
	6.3 m/s		+14

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

13 September, sat

	749 mmHg		82%
	6.5 m/s		+14

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

14 September, sun

	750 mmHg		83%
	5.9 m/s		+14

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

15 September, mon

	750 mmHg		84%
	5.8 m/s		+14

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

16 September, tue

	749 mmHg		83%
	6.1 m/s		+14

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

17 September, wed

	749 mmHg		82%
	5.3 m/s		+14

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

18 September, thu

	749 mmHg		83%
	5.7 m/s		+14

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

19 September, fri

	749 mmHg		84%
	5.6 m/s		+14

19 September, Friday. day, 15°; night, 10°; partly cloudy

20 September, sat

	749 mmHg		84%
	5.8 m/s		+14

20 September, Saturday. day, 15°; night, 10°; clear

21 September, sun

	749 mmHg		84%
	6.1 m/s		+14

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

22 September, mon

	749 mmHg		84%
	6.2 m/s		+14

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

23 September, tue

	748 mmHg		83%
	6.6 m/s		+14

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

24 September, wed

	747 mmHg		84%
	6.4 m/s		+14

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

25 September, thu

	748 mmHg		84%
	6.3 m/s		+14

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

26 September, fri

	748 mmHg		83%
	6.3 m/s		+14

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

27 September, sat

	748 mmHg		84%
	6.2 m/s		+14

27 September, Saturday. day, 14°; night, 10°; overcast

28 September, sun

	748 mmHg		84%
	6.3 m/s		+14

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

29 September, mon

	747 mmHg		84%
	6.1 m/s		+14

29 September, Monday. day, 14°; night, 10°; rain

30 September, tue

	745 mmHg		87%
	6.6 m/s		+13

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

1 October, wed

	744 mmHg		84%
	6.9 m/s		+13

1 October, Wednesday. day, 13°; night, 9°; clear

2 October, thu

	746 mmHg		82%
	6.5 m/s		+13

2 October, Thursday. day, 13°; night, 9°; partly cloudy

3 October, fri

	745 mmHg		83%
	7.2 m/s		+13

3 October, Friday. day, 13°; night, 9°; rain

4 October, sat

	745 mmHg		83%
	7.2 m/s		+13

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

Average data for 10 years

Belfast September

3

sunny days

15

days with precipitation

13

cloudy days

3 sunny days; 15 days with precipitation; 13 cloudy days;

84

%

air humidity

4.4

m/s

WindSW

81

mm of precipitation

(8% of annual average)

+14

°C

Water temperature

air humidity 84%; 81 millimeters of precipitation (8% of annual average); Wind south-westerly 4.4 Meters per second; Water temperature +14°

Weather graphs for September

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

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

S

S

S

S

S

SW

S

S

SW

S

SW

SW

S

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
Edinburgh
Manchester
Liverpool
Carrickfinn
Glasgow
Cork
Galway
Wicklow

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 Belfast is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Belfast has 15 rainy, 6 cloudy, 6 partly cloudy, and 3 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 Belfast.

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