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September weather forecast in Southold

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

	763 mmHg		76%
	5.9 m/s		+23

31 August, Sunday. day, 24°; night, 20°; partly cloudy

1 September, mon

	763 mmHg		73%
	6.2 m/s		+23

1 September, Monday. day, 23°; night, 20°; partly cloudy

2 September, tue

	763 mmHg		74%
	6.3 m/s		+23

2 September, Tuesday. day, 23°; night, 19°; clear

3 September, wed

	762 mmHg		77%
	6.2 m/s		+23

3 September, Wednesday. day, 23°; night, 19°; partly cloudy

4 September, thu

	762 mmHg		77%
	5.6 m/s		+23

4 September, Thursday. day, 24°; night, 19°; clear

5 September, fri

	764 mmHg		74%
	6.1 m/s		+23

5 September, Friday. day, 23°; night, 19°; clear

6 September, sat

	764 mmHg		77%
	6.6 m/s		+23

6 September, Saturday. day, 22°; night, 19°; rain

7 September, sun

	763 mmHg		79%
	6.5 m/s		+23

7 September, Sunday. day, 23°; night, 19°; rain

8 September, mon

	762 mmHg		80%
	6.3 m/s		+22

8 September, Monday. day, 23°; night, 19°; partly cloudy

9 September, tue

	763 mmHg		78%
	6.2 m/s		+22

9 September, Tuesday. day, 22°; night, 19°; overcast

10 September, wed

	763 mmHg		77%
	6.4 m/s		+22

10 September, Wednesday. day, 22°; night, 18°; clear

11 September, thu

	764 mmHg		75%
	6.7 m/s		+22

11 September, Thursday. day, 22°; night, 18°; rain

12 September, fri

	764 mmHg		74%
	6.4 m/s		+22

12 September, Friday. day, 22°; night, 18°; clear

13 September, sat

	763 mmHg		78%
	6 m/s		+23

13 September, Saturday. day, 22°; night, 19°; rain

14 September, sun

	763 mmHg		78%
	6 m/s		+22

14 September, Sunday. day, 22°; night, 18°; partly cloudy

15 September, mon

	764 mmHg		75%
	6.5 m/s		+22

15 September, Monday. day, 22°; night, 18°; clear

16 September, tue

	764 mmHg		74%
	6.4 m/s		+22

16 September, Tuesday. day, 21°; night, 17°; rain

17 September, wed

	764 mmHg		74%
	6.2 m/s		+22

17 September, Wednesday. day, 21°; night, 17°; clear

18 September, thu

	763 mmHg		76%
	6.7 m/s		+22

18 September, Thursday. day, 21°; night, 17°; overcast

19 September, fri

	764 mmHg		74%
	6.8 m/s		+21

19 September, Friday. day, 21°; night, 16°; clear

20 September, sat

	764 mmHg		74%
	6.4 m/s		+21

20 September, Saturday. day, 21°; night, 17°; clear

21 September, sun

	764 mmHg		73%
	6 m/s		+22

21 September, Sunday. day, 21°; night, 17°; clear

22 September, mon

	763 mmHg		77%
	6.6 m/s		+21

22 September, Monday. day, 21°; night, 17°; overcast

23 September, tue

	763 mmHg		74%
	7.2 m/s		+21

23 September, Tuesday. day, 21°; night, 17°; clear

24 September, wed

	764 mmHg		73%
	6.7 m/s		+21

24 September, Wednesday. day, 20°; night, 16°; partly cloudy

25 September, thu

	764 mmHg		72%
	6.7 m/s		+21

25 September, Thursday. day, 20°; night, 16°; partly cloudy

26 September, fri

	763 mmHg		77%
	6.7 m/s		+21

26 September, Friday. day, 20°; night, 17°; rain

27 September, sat

	763 mmHg		79%
	6.2 m/s		+21

27 September, Saturday. day, 20°; night, 16°; overcast

28 September, sun

	762 mmHg		80%
	7 m/s		+21

28 September, Sunday. day, 20°; night, 17°; rain

29 September, mon

	762 mmHg		77%
	7.6 m/s		+21

29 September, Monday. day, 19°; night, 16°; rain

30 September, tue

	763 mmHg		73%
	7.3 m/s		+20

30 September, Tuesday. day, 18°; night, 15°; rain

1 October, wed

	763 mmHg		75%
	7 m/s		+20

1 October, Wednesday. day, 18°; night, 15°; clear

2 October, thu

	763 mmHg		73%
	6.8 m/s		+20

2 October, Thursday. day, 19°; night, 14°; clear

3 October, fri

	764 mmHg		75%
	6.5 m/s		+20

3 October, Friday. day, 18°; night, 15°; clear

4 October, sat

	765 mmHg		78%
	6.7 m/s		+19

4 October, Saturday. day, 18°; night, 15°; rain

Average data for 10 years

Southold September

11

sunny days

9

days with precipitation

7

cloudy days

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

76

%

air humidity

4.6

m/s

WindS

111

mm of precipitation

(9% of annual average)

+22

°C

Water temperature

air humidity 76%; 111 millimeters of precipitation (9% of annual average); Wind southerly 4.6 Meters per second; Water temperature +22°

Weather graphs for September

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

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SW

S

S

S

S

S

S

S

S

S

SW

S

S

S

S

S

S

S

S

SW

S

S

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S

S

S

S

1

Average data for 10 years

2

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8

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11

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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

Suhum
Burgas
Varna
Tivat
The Sunny Beach
Podgorica
Toronto
The Golden Sands
Chicago

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

In September, the weather in Southold is typically warm. Average daily high temperature in September is about 21 degrees above zero. On average, Southold has 11 sunny, 9 rainy, 6 partly cloudy, and 4 cloudy days in September. The rains are usually heavy.

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