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September weather forecast in Dartmouth

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

	743 mmHg		81%
	5.5 m/s		+16

31 August, Sunday. day, 18°; night, 11°; partly cloudy

1 September, mon

	743 mmHg		81%
	5 m/s		+16

1 September, Monday. day, 18°; night, 11°; partly cloudy

2 September, tue

	743 mmHg		84%
	5.3 m/s		+16

2 September, Tuesday. day, 18°; night, 11°; partly cloudy

3 September, wed

	742 mmHg		84%
	5.9 m/s		+16

3 September, Wednesday. day, 18°; night, 12°; rain

4 September, thu

	742 mmHg		84%
	5.6 m/s		+16

4 September, Thursday. day, 18°; night, 12°; clear

5 September, fri

	742 mmHg		84%
	5.8 m/s		+16

5 September, Friday. day, 18°; night, 12°; clear

6 September, sat

	741 mmHg		84%
	5.8 m/s		+16

6 September, Saturday. day, 18°; night, 12°; rain

7 September, sun

	741 mmHg		84%
	5.8 m/s		+16

7 September, Sunday. day, 18°; night, 12°; overcast

8 September, mon

	741 mmHg		85%
	5.9 m/s		+16

8 September, Monday. day, 18°; night, 12°; overcast

9 September, tue

	741 mmHg		84%
	5.9 m/s		+16

9 September, Tuesday. day, 18°; night, 12°; rain

10 September, wed

	741 mmHg		84%
	6.4 m/s		+16

10 September, Wednesday. day, 18°; night, 12°; partly cloudy

11 September, thu

	741 mmHg		84%
	6.2 m/s		+16

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

12 September, fri

	741 mmHg		83%
	6.1 m/s		+16

12 September, Friday. day, 17°; night, 11°; overcast

13 September, sat

	742 mmHg		82%
	5.8 m/s		+16

13 September, Saturday. day, 17°; night, 10°; rain

14 September, sun

	742 mmHg		82%
	5.7 m/s		+16

14 September, Sunday. day, 17°; night, 10°; clear

15 September, mon

	742 mmHg		82%
	5.8 m/s		+16

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

16 September, tue

	741 mmHg		81%
	6 m/s		+16

16 September, Tuesday. day, 17°; night, 11°; partly cloudy

17 September, wed

	741 mmHg		82%
	6.2 m/s		+16

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

18 September, thu

	741 mmHg		82%
	6.6 m/s		+16

18 September, Thursday. day, 17°; night, 10°; clear

19 September, fri

	742 mmHg		84%
	6.1 m/s		+16

19 September, Friday. day, 17°; night, 11°; rain

20 September, sat

	742 mmHg		85%
	6 m/s		+16

20 September, Saturday. day, 17°; night, 11°; overcast

21 September, sun

	741 mmHg		84%
	5.7 m/s		+16

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

22 September, mon

	741 mmHg		85%
	5.8 m/s		+16

22 September, Monday. day, 17°; night, 10°; partly cloudy

23 September, tue

	741 mmHg		85%
	6.5 m/s		+16

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

24 September, wed

	740 mmHg		83%
	6.4 m/s		+16

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

25 September, thu

	741 mmHg		84%
	5.7 m/s		+16

25 September, Thursday. day, 16°; night, 10°; rain

26 September, fri

	741 mmHg		86%
	6.5 m/s		+16

26 September, Friday. day, 16°; night, 10°; rain

27 September, sat

	741 mmHg		85%
	6.6 m/s		+16

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

28 September, sun

	741 mmHg		86%
	6.3 m/s		+16

28 September, Sunday. day, 16°; night, 10°; overcast

29 September, mon

	740 mmHg		85%
	6.3 m/s		+16

29 September, Monday. day, 16°; night, 10°; overcast

30 September, tue

	738 mmHg		88%
	7 m/s		+16

30 September, Tuesday. day, 16°; night, 10°; rain

1 October, wed

	738 mmHg		85%
	7.1 m/s		+16

1 October, Wednesday. day, 16°; night, 11°; rain

2 October, thu

	739 mmHg		85%
	6.5 m/s		+16

2 October, Thursday. day, 15°; night, 10°; rain

3 October, fri

	740 mmHg		85%
	6.8 m/s		+16

3 October, Friday. day, 15°; night, 10°; clear

4 October, sat

	740 mmHg		83%
	7.4 m/s		+16

4 October, Saturday. day, 15°; night, 9°; partly cloudy

Average data for 10 years

Dartmouth September

5

sunny days

10

days with precipitation

9

cloudy days

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

84

%

air humidity

4.3

m/s

WindS

57

mm of precipitation

(7% of annual average)

+16

°C

Water temperature

air humidity 84%; 57 millimeters of precipitation (7% of annual average); Wind southerly 4.3 Meters per second; Water temperature +16°

Weather graphs for September

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

SW

SW

SW

SW

S

SW

S

S

S

S

SW

SW

S

SW

SW

S

S

S

S

S

S

S

S

S

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

London
Manchester
Brest
Liverpool
Trowbridge
Oxford
Le Havre
Bournemouth
Wicklow

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Yurmala
Palanga
Dublin
Buenos Aires
Copenhagen

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

In September, the weather in Dartmouth is typically warm. Average daily high temperature in September is about 17 degrees above zero. On average, Dartmouth has 10 rainy, 8 partly cloudy, 7 cloudy, and 5 sunny days in September. The rains are usually moderate.

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