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September weather forecast in St. John's

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

	761 mmHg		81%
	7.7 m/s		+29

31 August, Sunday. day, 28°; night, 27°; partly cloudy

1 September, mon

	760 mmHg		82%
	7.5 m/s		+29

1 September, Monday. day, 28°; night, 27°; clear

2 September, tue

	760 mmHg		82%
	7.6 m/s		+29

2 September, Tuesday. day, 28°; night, 27°; rain

3 September, wed

	760 mmHg		81%
	7.5 m/s		+29

3 September, Wednesday. day, 28°; night, 27°; rain

4 September, thu

	760 mmHg		81%
	7.6 m/s		+29

4 September, Thursday. day, 28°; night, 27°; clear

5 September, fri

	760 mmHg		81%
	8.2 m/s		+29

5 September, Friday. day, 28°; night, 27°; rain

6 September, sat

	760 mmHg		82%
	8.2 m/s		+29

6 September, Saturday. day, 28°; night, 27°; rain

7 September, sun

	760 mmHg		82%
	7.6 m/s		+29

7 September, Sunday. day, 28°; night, 26°; rain

8 September, mon

	760 mmHg		82%
	7.4 m/s		+29

8 September, Monday. day, 28°; night, 27°; rain

9 September, tue

	760 mmHg		80%
	7.5 m/s		+29

9 September, Tuesday. day, 28°; night, 27°; partly cloudy

10 September, wed

	760 mmHg		81%
	7.7 m/s		+29

10 September, Wednesday. day, 28°; night, 27°; partly cloudy

11 September, thu

	760 mmHg		81%
	7.9 m/s		+29

11 September, Thursday. day, 28°; night, 27°; clear

12 September, fri

	760 mmHg		81%
	7.6 m/s		+29

12 September, Friday. day, 28°; night, 27°; clear

13 September, sat

	760 mmHg		80%
	7.4 m/s		+29

13 September, Saturday. day, 28°; night, 27°; overcast

14 September, sun

	760 mmHg		82%
	7.6 m/s		+29

14 September, Sunday. day, 28°; night, 26°; rain

15 September, mon

	761 mmHg		82%
	7.8 m/s		+29

15 September, Monday. day, 28°; night, 27°; rain

16 September, tue

	760 mmHg		81%
	8.1 m/s		+29

16 September, Tuesday. day, 28°; night, 27°; overcast

17 September, wed

	760 mmHg		82%
	7.8 m/s		+29

17 September, Wednesday. day, 28°; night, 26°; rain

18 September, thu

	760 mmHg		81%
	7.1 m/s		+29

18 September, Thursday. day, 28°; night, 26°; rain

19 September, fri

	760 mmHg		82%
	7.2 m/s		+29

19 September, Friday. day, 28°; night, 26°; rain

20 September, sat

	760 mmHg		81%
	7.4 m/s		+29

20 September, Saturday. day, 28°; night, 26°; rain

21 September, sun

	760 mmHg		81%
	7.2 m/s		+29

21 September, Sunday. day, 28°; night, 26°; rain

22 September, mon

	760 mmHg		81%
	6.9 m/s		+29

22 September, Monday. day, 28°; night, 26°; rain

23 September, tue

	760 mmHg		81%
	7.2 m/s		+29

23 September, Tuesday. day, 28°; night, 27°; clear

24 September, wed

	760 mmHg		80%
	7.3 m/s		+29

24 September, Wednesday. day, 28°; night, 27°; rain

25 September, thu

	760 mmHg		81%
	7.1 m/s		+29

25 September, Thursday. day, 28°; night, 27°; rain

26 September, fri

	760 mmHg		81%
	6.7 m/s		+29

26 September, Friday. day, 28°; night, 27°; rain

27 September, sat

	760 mmHg		81%
	7.3 m/s		+29

27 September, Saturday. day, 28°; night, 27°; rain

28 September, sun

	760 mmHg		80%
	7.3 m/s		+29

28 September, Sunday. day, 28°; night, 27°; rain

29 September, mon

	760 mmHg		81%
	7.1 m/s		+29

29 September, Monday. day, 28°; night, 27°; rain

30 September, tue

	760 mmHg		81%
	7 m/s		+29

30 September, Tuesday. day, 28°; night, 27°; rain

1 October, wed

	760 mmHg		81%
	7.2 m/s		+29

1 October, Wednesday. day, 28°; night, 26°; rain

2 October, thu

	760 mmHg		82%
	7.6 m/s		+29

2 October, Thursday. day, 28°; night, 26°; rain

3 October, fri

	760 mmHg		81%
	7.4 m/s		+29

3 October, Friday. day, 28°; night, 26°; rain

4 October, sat

	760 mmHg		81%
	7.8 m/s		+29

4 October, Saturday. day, 28°; night, 26°; rain

Average data for 10 years

St. John's September

5

sunny days

21

days with precipitation

9

cloudy days

5 sunny days; 21 days with precipitation; 9 cloudy days;

81

%

air humidity

6

m/s

WindE

134

mm of precipitation

(15% of annual average)

+29

°C

Water temperature

air humidity 81%; 134 millimeters of precipitation (15% of annual average); Wind easterly 6 Meters per second; Water temperature +29°

Weather graphs for September

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

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

SE

SE

E

E

E

E

E

E

E

E

E

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

Charlotte Amalie
The Valley
Basseterre
Fort-de-France
Road Town
Roseau
Cyril E. King Airport
Christiansted
Terrance B. Lettsome International Airport

Cities with similar weather in September

Santo Domingo
Varadero
Phan Thiet
Havana
Krabi
Ko Chang
Mumbai
Puerto Plata
Panaji

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

September in St. John's is the hottest month of the year. In September, the weather in St. John's is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, St. John's has 21 rainy, 5 sunny, 2 cloudy, and 2 partly cloudy days in September. The rains are usually heavy. September as well as May, July, August, and October is considered the most uncomfortable time to visit St. John's.

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