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September weather forecast in Saint John

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

	749 mmHg		78%
	4.8 m/s		+14

31 August, Sunday. day, 22°; night, 13°; clear

1 September, mon

	750 mmHg		78%
	4.5 m/s		+14

1 September, Monday. day, 22°; night, 13°; clear

2 September, tue

	751 mmHg		78%
	4.6 m/s		+14

2 September, Tuesday. day, 21°; night, 12°; partly cloudy

3 September, wed

	750 mmHg		81%
	4.6 m/s		+14

3 September, Wednesday. day, 21°; night, 12°; clear

4 September, thu

	749 mmHg		81%
	4.6 m/s		+14

4 September, Thursday. day, 21°; night, 13°; partly cloudy

5 September, fri

	750 mmHg		77%
	4.6 m/s		+14

5 September, Friday. day, 21°; night, 12°; clear

6 September, sat

	751 mmHg		77%
	4.5 m/s		+14

6 September, Saturday. day, 21°; night, 12°; clear

7 September, sun

	750 mmHg		81%
	4.8 m/s		+14

7 September, Sunday. day, 21°; night, 12°; overcast

8 September, mon

	749 mmHg		83%
	4.69 m/s		+14

8 September, Monday. day, 20°; night, 13°; rain

9 September, tue

	750 mmHg		82%
	4.4 m/s		+14

9 September, Tuesday. day, 20°; night, 13°; rain

10 September, wed

	750 mmHg		82%
	4.5 m/s		+14

10 September, Wednesday. day, 20°; night, 12°; rain

11 September, thu

	751 mmHg		80%
	4.9 m/s		+14

11 September, Thursday. day, 19°; night, 11°; rain

12 September, fri

	751 mmHg		80%
	4.8 m/s		+14

12 September, Friday. day, 20°; night, 11°; clear

13 September, sat

	751 mmHg		81%
	4.4 m/s		+14

13 September, Saturday. day, 19°; night, 11°; clear

14 September, sun

	750 mmHg		83%
	4.6 m/s		+14

14 September, Sunday. day, 19°; night, 12°; partly cloudy

15 September, mon

	750 mmHg		83%
	5 m/s		+14

15 September, Monday. day, 19°; night, 11°; rain

16 September, tue

	750 mmHg		80%
	4.9 m/s		+14

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

17 September, wed

	751 mmHg		79%
	4.6 m/s		+14

17 September, Wednesday. day, 19°; night, 10°; clear

18 September, thu

	750 mmHg		82%
	4.4 m/s		+14

18 September, Thursday. day, 18°; night, 10°; rain

19 September, fri

	751 mmHg		79%
	4.69 m/s		+14

19 September, Friday. day, 18°; night, 9°; partly cloudy

20 September, sat

	751 mmHg		82%
	4.69 m/s		+13

20 September, Saturday. day, 18°; night, 10°; overcast

21 September, sun

	751 mmHg		80%
	4.69 m/s		+14

21 September, Sunday. day, 19°; night, 11°; clear

22 September, mon

	751 mmHg		82%
	5 m/s		+13

22 September, Monday. day, 18°; night, 10°; overcast

23 September, tue

	749 mmHg		81%
	4.9 m/s		+14

23 September, Tuesday. day, 17°; night, 11°; rain

24 September, wed

	750 mmHg		77%
	4.69 m/s		+13

24 September, Wednesday. day, 17°; night, 9°; clear

25 September, thu

	751 mmHg		80%
	4.9 m/s		+13

25 September, Thursday. day, 17°; night, 8°; clear

26 September, fri

	751 mmHg		82%
	4.6 m/s		+13

26 September, Friday. day, 17°; night, 10°; partly cloudy

27 September, sat

	751 mmHg		83%
	4.6 m/s		+14

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

28 September, sun

	750 mmHg		84%
	5 m/s		+14

28 September, Sunday. day, 18°; night, 10°; rain

29 September, mon

	750 mmHg		82%
	5.4 m/s		+13

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

30 September, tue

	751 mmHg		81%
	5 m/s		+13

30 September, Tuesday. day, 16°; night, 8°; clear

1 October, wed

	751 mmHg		83%
	4.4 m/s		+13

1 October, Wednesday. day, 16°; night, 8°; partly cloudy

2 October, thu

	750 mmHg		81%
	4.9 m/s		+13

2 October, Thursday. day, 16°; night, 8°; partly cloudy

3 October, fri

	751 mmHg		79%
	4.69 m/s		+13

3 October, Friday. day, 16°; night, 8°; clear

4 October, sat

	753 mmHg		80%
	4.4 m/s		+13

4 October, Saturday. day, 15°; night, 7°; clear

Average data for 10 years

Saint John September

11

sunny days

10

days with precipitation

9

cloudy days

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

81

%

air humidity

3.3

m/s

WindSW

100

mm of precipitation

(9% of annual average)

+14

°C

Water temperature

air humidity 81%; 100 millimeters of precipitation (9% of annual average); Wind south-westerly 3.3 Meters per second; Water temperature +14°

Weather graphs for September

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

SW

S

SW

SW

SW

SW

SW

SW

S

SW

S

SW

S

SW

SW

SW

SW

SW

S

S

SW

S

SW

SW

SW

S

SW

S

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

Halifax
Bangor
Liverpool
New Glasgow
Augusta
Bridgewater
Bonaventure
Iles de la Madeleine
Charlottetown

Cities with similar weather in September

Helsinki
Riga
Stockholm
Yurmala
Palanga
Copenhagen
Capetown
Gdansk
Looe

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

September in Saint John is the sunniest month of the year. In September, the weather in Saint John is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, Saint John has 11 sunny, 10 rainy, 5 partly cloudy, and 4 cloudy days in September. The rains are usually heavy.

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