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September weather forecast in Stamford

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

	754 mmHg		70%
	3.8 m/s		+27

31 August, Sunday. day, 26°; night, 19°; partly cloudy

1 September, mon

	755 mmHg		70%
	3.6 m/s		+26

1 September, Monday. day, 25°; night, 18°; rain

2 September, tue

	754 mmHg		72%
	3.7 m/s		+26

2 September, Tuesday. day, 25°; night, 17°; rain

3 September, wed

	754 mmHg		73%
	3.6 m/s		+25

3 September, Wednesday. day, 26°; night, 18°; overcast

4 September, thu

	753 mmHg		72%
	3.6 m/s		+25

4 September, Thursday. day, 26°; night, 18°; clear

5 September, fri

	755 mmHg		70%
	3.8 m/s		+24

5 September, Friday. day, 25°; night, 18°; clear

6 September, sat

	755 mmHg		73%
	3.8 m/s		+24

6 September, Saturday. day, 25°; night, 17°; clear

7 September, sun

	754 mmHg		75%
	3.9 m/s		+25

7 September, Sunday. day, 25°; night, 17°; rain

8 September, mon

	753 mmHg		75%
	3.8 m/s		+24

8 September, Monday. day, 25°; night, 18°; partly cloudy

9 September, tue

	754 mmHg		75%
	3.7 m/s		+24

9 September, Tuesday. day, 24°; night, 17°; rain

10 September, wed

	755 mmHg		75%
	3.8 m/s		+24

10 September, Wednesday. day, 24°; night, 17°; partly cloudy

11 September, thu

	755 mmHg		73%
	4 m/s		+24

11 September, Thursday. day, 24°; night, 16°; partly cloudy

12 September, fri

	755 mmHg		73%
	3.7 m/s		+24

12 September, Friday. day, 24°; night, 16°; clear

13 September, sat

	754 mmHg		76%
	3.5 m/s		+24

13 September, Saturday. day, 24°; night, 17°; rain

14 September, sun

	754 mmHg		76%
	4 m/s		+24

14 September, Sunday. day, 24°; night, 16°; partly cloudy

15 September, mon

	755 mmHg		74%
	3.9 m/s		+23

15 September, Monday. day, 23°; night, 16°; clear

16 September, tue

	755 mmHg		75%
	3.7 m/s		+22

16 September, Tuesday. day, 22°; night, 15°; rain

17 September, wed

	755 mmHg		74%
	3.7 m/s		+23

17 September, Wednesday. day, 22°; night, 14°; clear

18 September, thu

	754 mmHg		76%
	4 m/s		+23

18 September, Thursday. day, 22°; night, 15°; partly cloudy

19 September, fri

	755 mmHg		72%
	4 m/s		+22

19 September, Friday. day, 22°; night, 14°; clear

20 September, sat

	755 mmHg		74%
	3.8 m/s		+22

20 September, Saturday. day, 23°; night, 14°; clear

21 September, sun

	755 mmHg		73%
	3.7 m/s		+23

21 September, Sunday. day, 23°; night, 15°; clear

22 September, mon

	754 mmHg		75%
	4.3 m/s		+23

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

23 September, tue

	754 mmHg		72%
	4.3 m/s		+23

23 September, Tuesday. day, 22°; night, 15°; clear

24 September, wed

	755 mmHg		72%
	3.9 m/s		+23

24 September, Wednesday. day, 22°; night, 14°; clear

25 September, thu

	755 mmHg		72%
	3.9 m/s		+22

25 September, Thursday. day, 21°; night, 14°; clear

26 September, fri

	754 mmHg		77%
	3.9 m/s		+22

26 September, Friday. day, 21°; night, 14°; overcast

27 September, sat

	754 mmHg		79%
	3.7 m/s		+22

27 September, Saturday. day, 22°; night, 14°; overcast

28 September, sun

	753 mmHg		81%
	4.5 m/s		+22

28 September, Sunday. day, 21°; night, 15°; rain

29 September, mon

	753 mmHg		77%
	4.6 m/s		+20

29 September, Monday. day, 19°; night, 14°; rain

30 September, tue

	754 mmHg		75%
	4.19 m/s		+19

30 September, Tuesday. day, 19°; night, 13°; rain

1 October, wed

	754 mmHg		78%
	4.1 m/s		+20

1 October, Wednesday. day, 19°; night, 12°; partly cloudy

2 October, thu

	754 mmHg		75%
	4.1 m/s		+19

2 October, Thursday. day, 20°; night, 12°; clear

3 October, fri

	755 mmHg		76%
	3.7 m/s		+20

3 October, Friday. day, 20°; night, 12°; clear

4 October, sat

	756 mmHg		80%
	3.8 m/s		+20

4 October, Saturday. day, 19°; night, 12°; rain

Average data for 10 years

Stamford September

12

sunny days

9

days with precipitation

7

cloudy days

12 sunny days; 9 days with precipitation; 7 cloudy days;

74

%

air humidity

2.7

m/s

WindS

108

mm of precipitation

(10% of annual average)

+23

°C

Water temperature

air humidity 74%; 108 millimeters of precipitation (10% of annual average); Wind southerly 2.7 Meters per second; Water temperature +23°

Weather graphs for September

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

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S

SW

SW

S

S

S

S

S

S

S

S

S

SW

SW

SW

S

S

S

S

SW

S

SW

S

S

S

S

S

S

S

1

Average data for 10 years

2

3

4

5

6

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8

9

10

11

12

13

14

15

16

17

18

19

20

21

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27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

New York
Boston
Philadelphia
Islandia
Colchester
Jamaica
Brooklyn
Brookhaven
Lake George

Cities with similar weather in September

Gagra
Suhum
Pitsunda
Burgas
Rimini
Tivat
The Sunny Beach
Chicago
Porto

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

September in Stamford is the sunniest month of the year. In September, the weather in Stamford is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Stamford has 12 sunny, 9 rainy, 5 partly cloudy, and 4 cloudy days in September. The rains are usually heavy.

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