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September weather forecast in Groton

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		68%
	5.5 m/s		+27

31 August, Sunday. day, 25°; night, 21°; clear

1 September, mon

	760 mmHg		73%
	4.9 m/s		+27

1 September, Monday. day, 24°; night, 21°; clear

2 September, tue

	758 mmHg		74%
	5 m/s		+26

2 September, Tuesday. day, 23°; night, 20°; partly cloudy

3 September, wed

	759 mmHg		69%
	5.5 m/s		+26

3 September, Wednesday. day, 24°; night, 20°; clear

4 September, thu

	760 mmHg		73%
	5.6 m/s		+26

4 September, Thursday. day, 24°; night, 20°; partly cloudy

5 September, fri

	761 mmHg		73%
	7.4 m/s		+24

5 September, Friday. day, 22°; night, 20°; partly cloudy

6 September, sat

	760 mmHg		77%
	6 m/s		+24

6 September, Saturday. day, 22°; night, 18°; clear

7 September, sun

	759 mmHg		73%
	5.5 m/s		+26

7 September, Sunday. day, 24°; night, 20°; partly cloudy

8 September, mon

	760 mmHg		72%
	5.6 m/s		+25

8 September, Monday. day, 22°; night, 18°; partly cloudy

9 September, tue

	760 mmHg		74%
	6.1 m/s		+25

9 September, Tuesday. day, 22°; night, 18°; rain

10 September, wed

	761 mmHg		73%
	6.3 m/s		+24

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

11 September, thu

	760 mmHg		73%
	5.6 m/s		+25

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

12 September, fri

	759 mmHg		76%
	5.8 m/s		+24

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

13 September, sat

	760 mmHg		70%
	5.3 m/s		+25

13 September, Saturday. day, 22°; night, 18°; clear

14 September, sun

	761 mmHg		69%
	5.6 m/s		+25

14 September, Sunday. day, 22°; night, 18°; clear

15 September, mon

	762 mmHg		68%
	5.6 m/s		+23

15 September, Monday. day, 20°; night, 18°; partly cloudy

16 September, tue

	764 mmHg		67%
	5.3 m/s		+22

16 September, Tuesday. day, 19°; night, 15°; partly cloudy

17 September, wed

	763 mmHg		69%
	4.6 m/s		+23

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

18 September, thu

	762 mmHg		72%
	6.5 m/s		+22

18 September, Thursday. day, 20°; night, 16°; clear

19 September, fri

	762 mmHg		70%
	6.8 m/s		+22

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

20 September, sat

	762 mmHg		73%
	5.9 m/s		+23

20 September, Saturday. day, 20°; night, 16°; clear

21 September, sun

	761 mmHg		72%
	6.3 m/s		+23

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

22 September, mon

	763 mmHg		74%
	5.5 m/s		+23

22 September, Monday. day, 21°; night, 16°; clear

23 September, tue

	763 mmHg		69%
	5.3 m/s		+24

23 September, Tuesday. day, 22°; night, 18°; clear

24 September, wed

	763 mmHg		68%
	5.1 m/s		+23

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

25 September, thu

	764 mmHg		67%
	5.4 m/s		+22

25 September, Thursday. day, 19°; night, 15°; clear

26 September, fri

	762 mmHg		80%
	5.3 m/s		+22

26 September, Friday. day, 20°; night, 16°; partly cloudy

27 September, sat

	759 mmHg		77%
	5.9 m/s		+23

27 September, Saturday. day, 22°; night, 18°; rain

28 September, sun

	758 mmHg		79%
	5.9 m/s		+22

28 September, Sunday. day, 20°; night, 17°; partly cloudy

29 September, mon

	758 mmHg		82%
	6.9 m/s		+20

29 September, Monday. day, 18°; night, 17°; overcast

30 September, tue

	759 mmHg		80%
	6 m/s		+20

30 September, Tuesday. day, 17°; night, 15°; rain

1 October, wed

	760 mmHg		74%
	6.5 m/s		+20

1 October, Wednesday. day, 17°; night, 14°; rain

2 October, thu

	762 mmHg		77%
	6 m/s		+19

2 October, Thursday. day, 16°; night, 14°; overcast

3 October, fri

	760 mmHg		82%
	6 m/s		+19

3 October, Friday. day, 17°; night, 15°; clear

4 October, sat

	761 mmHg		73%
	6.1 m/s		+19

4 October, Saturday. day, 17°; night, 14°; clear

Average data for 10 years

Groton September

15

sunny days

3

days with precipitation

12

cloudy days

15 sunny days; 3 days with precipitation; 12 cloudy days;

73

%

air humidity

4.3

m/s

WindNW

71

mm of precipitation

(8% of annual average)

+24

°C

Water temperature

air humidity 73%; 71 millimeters of precipitation (8% of annual average); Wind north-westerly 4.3 Meters per second; Water temperature +24°

Weather graphs for September

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

SW

SE

W

SW

SW

SW

W

NW

N

NE

SW

S

W

W

NW

N

NW

NE

N

NE

NW

NE

NW

NE

NE

E

S

S

NE

N

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
Islandia
Philadelphia
Brooklyn
Jamaica
Colchester
Portland
Atlantic City

Cities with similar weather in September

Burgas
Varna
Podgorica
Toronto
The Golden Sands
Chicago
Genoa
Seattle
Dubrovnik

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

In September, the weather in Groton is typically warm. Average daily high temperature in September is about 21 degrees above zero. On average, Groton has 15 sunny, 11 partly cloudy, 3 rainy, and 1 cloudy day in September. The rains are usually heavy. September as well as August is considered the most comfortable time to visit Groton.

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