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September weather forecast in Block Island

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		81%
	6.5 m/s		+21

31 August, Sunday. day, 23°; night, 20°; overcast

1 September, mon

	763 mmHg		77%
	6.6 m/s		+21

1 September, Monday. day, 22°; night, 20°; partly cloudy

2 September, tue

	763 mmHg		78%
	6.8 m/s		+21

2 September, Tuesday. day, 21°; night, 19°; partly cloudy

3 September, wed

	762 mmHg		80%
	6.4 m/s		+21

3 September, Wednesday. day, 22°; night, 19°; partly cloudy

4 September, thu

	762 mmHg		81%
	6.1 m/s		+21

4 September, Thursday. day, 22°; night, 19°; clear

5 September, fri

	764 mmHg		78%
	6.5 m/s		+21

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

6 September, sat

	764 mmHg		80%
	7.1 m/s		+21

6 September, Saturday. day, 21°; night, 19°; clear

7 September, sun

	763 mmHg		82%
	7 m/s		+21

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

8 September, mon

	762 mmHg		83%
	6.7 m/s		+21

8 September, Monday. day, 21°; night, 19°; partly cloudy

9 September, tue

	763 mmHg		81%
	6.9 m/s		+21

9 September, Tuesday. day, 21°; night, 19°; overcast

10 September, wed

	763 mmHg		81%
	6.8 m/s		+20

10 September, Wednesday. day, 21°; night, 19°; rain

11 September, thu

	764 mmHg		77%
	6.9 m/s		+20

11 September, Thursday. day, 21°; night, 18°; partly cloudy

12 September, fri

	764 mmHg		77%
	6.9 m/s		+20

12 September, Friday. day, 21°; night, 18°; clear

13 September, sat

	763 mmHg		81%
	6.5 m/s		+20

13 September, Saturday. day, 21°; night, 19°; rain

14 September, sun

	763 mmHg		81%
	6.2 m/s		+20

14 September, Sunday. day, 21°; night, 18°; clear

15 September, mon

	764 mmHg		78%
	6.7 m/s		+20

15 September, Monday. day, 21°; night, 18°; clear

16 September, tue

	764 mmHg		77%
	6.6 m/s		+20

16 September, Tuesday. day, 20°; night, 17°; rain

17 September, wed

	764 mmHg		78%
	6.7 m/s		+20

17 September, Wednesday. day, 20°; night, 17°; clear

18 September, thu

	763 mmHg		79%
	7.4 m/s		+20

18 September, Thursday. day, 20°; night, 17°; overcast

19 September, fri

	764 mmHg		78%
	7.2 m/s		+20

19 September, Friday. day, 20°; night, 17°; clear

20 September, sat

	764 mmHg		77%
	6.8 m/s		+20

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

21 September, sun

	764 mmHg		77%
	6.4 m/s		+20

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

22 September, mon

	763 mmHg		80%
	7 m/s		+20

22 September, Monday. day, 20°; night, 18°; overcast

23 September, tue

	763 mmHg		77%
	7.7 m/s		+20

23 September, Tuesday. day, 20°; night, 17°; rain

24 September, wed

	764 mmHg		75%
	7.1 m/s		+20

24 September, Wednesday. day, 19°; night, 16°; partly cloudy

25 September, thu

	764 mmHg		75%
	7.1 m/s		+20

25 September, Thursday. day, 19°; night, 16°; partly cloudy

26 September, fri

	763 mmHg		80%
	7.2 m/s		+19

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

27 September, sat

	763 mmHg		81%
	6.6 m/s		+19

27 September, Saturday. day, 19°; night, 17°; rain

28 September, sun

	762 mmHg		81%
	7.1 m/s		+19

28 September, Sunday. day, 19°; night, 17°; rain

29 September, mon

	762 mmHg		79%
	7.9 m/s		+19

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

30 September, tue

	763 mmHg		75%
	7.8 m/s		+19

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

1 October, wed

	763 mmHg		76%
	7.5 m/s		+19

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

2 October, thu

	763 mmHg		76%
	7.2 m/s		+19

2 October, Thursday. day, 18°; night, 15°; clear

3 October, fri

	764 mmHg		77%
	7 m/s		+19

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

4 October, sat

	765 mmHg		80%
	7.4 m/s		+18

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

Average data for 10 years

Block Island September

11

sunny days

9

days with precipitation

7

cloudy days

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

79

%

air humidity

5

m/s

WindS

105

mm of precipitation

(9% of annual average)

+20

°C

Water temperature

air humidity 79%; 105 millimeters of precipitation (9% of annual average); Wind southerly 5 Meters per second; Water temperature +20°

Weather graphs for September

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

S

SE

S

SW

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

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

New York
Boston
Philadelphia
Islandia
Colchester
Jamaica
Brooklyn
Brookhaven
Lake George

Cities with similar weather in September

Varna
Podgorica
Toronto
The Golden Sands
Chicago
Genoa
Seattle
Albena
San Remo

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

In September, the weather in Block Island is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Block Island has 11 sunny, 9 rainy, 7 partly cloudy, and 3 cloudy days in September. The rains are usually heavy.

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