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September weather forecast in Watertown

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

	752 mmHg		80%
	4.1 m/s		+23

31 August, Sunday. day, 23°; night, 16°; clear

1 September, mon

	753 mmHg		79%
	3.9 m/s		+23

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

2 September, tue

	752 mmHg		79%
	4.1 m/s		+23

2 September, Tuesday. day, 23°; night, 16°; clear

3 September, wed

	751 mmHg		80%
	4.3 m/s		+23

3 September, Wednesday. day, 23°; night, 16°; clear

4 September, thu

	751 mmHg		79%
	4.3 m/s		+22

4 September, Thursday. day, 23°; night, 17°; clear

5 September, fri

	753 mmHg		78%
	4.3 m/s		+22

5 September, Friday. day, 22°; night, 15°; clear

6 September, sat

	753 mmHg		79%
	4.1 m/s		+22

6 September, Saturday. day, 23°; night, 15°; clear

7 September, sun

	751 mmHg		79%
	4.5 m/s		+22

7 September, Sunday. day, 22°; night, 16°; rain

8 September, mon

	750 mmHg		81%
	5 m/s		+22

8 September, Monday. day, 21°; night, 16°; rain

9 September, tue

	752 mmHg		81%
	4.3 m/s		+22

9 September, Tuesday. day, 21°; night, 14°; partly cloudy

10 September, wed

	753 mmHg		78%
	4.19 m/s		+22

10 September, Wednesday. day, 21°; night, 14°; partly cloudy

11 September, thu

	753 mmHg		79%
	4.4 m/s		+21

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

12 September, fri

	752 mmHg		80%
	4.3 m/s		+20

12 September, Friday. day, 21°; night, 14°; rain

13 September, sat

	751 mmHg		81%
	4.6 m/s		+21

13 September, Saturday. day, 21°; night, 15°; rain

14 September, sun

	751 mmHg		80%
	4.69 m/s		+21

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

15 September, mon

	753 mmHg		81%
	4.5 m/s		+20

15 September, Monday. day, 19°; night, 14°; partly cloudy

16 September, tue

	754 mmHg		80%
	4 m/s		+20

16 September, Tuesday. day, 19°; night, 12°; clear

17 September, wed

	753 mmHg		80%
	4.19 m/s		+20

17 September, Wednesday. day, 20°; night, 12°; partly cloudy

18 September, thu

	753 mmHg		79%
	4.1 m/s		+20

18 September, Thursday. day, 20°; night, 13°; clear

19 September, fri

	753 mmHg		76%
	4.5 m/s		+20

19 September, Friday. day, 20°; night, 12°; clear

20 September, sat

	752 mmHg		78%
	4.69 m/s		+20

20 September, Saturday. day, 20°; night, 13°; clear

21 September, sun

	752 mmHg		79%
	4.8 m/s		+19

21 September, Sunday. day, 21°; night, 13°; clear

22 September, mon

	752 mmHg		79%
	5 m/s		+20

22 September, Monday. day, 20°; night, 14°; rain

23 September, tue

	752 mmHg		79%
	5 m/s		+20

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

24 September, wed

	753 mmHg		78%
	4.19 m/s		+19

24 September, Wednesday. day, 19°; night, 11°; clear

25 September, thu

	752 mmHg		78%
	4.4 m/s		+20

25 September, Thursday. day, 18°; night, 12°; partly cloudy

26 September, fri

	752 mmHg		80%
	4.6 m/s		+19

26 September, Friday. day, 19°; night, 12°; overcast

27 September, sat

	751 mmHg		82%
	4.69 m/s		+19

27 September, Saturday. day, 19°; night, 12°; rain

28 September, sun

	750 mmHg		81%
	4.9 m/s		+19

28 September, Sunday. day, 19°; night, 13°; rain

29 September, mon

	751 mmHg		79%
	5 m/s		+18

29 September, Monday. day, 17°; night, 12°; rain

30 September, tue

	752 mmHg		79%
	4.9 m/s		+17

30 September, Tuesday. day, 17°; night, 10°; rain

1 October, wed

	752 mmHg		80%
	4.9 m/s		+17

1 October, Wednesday. day, 17°; night, 11°; partly cloudy

2 October, thu

	752 mmHg		81%
	4.9 m/s		+17

2 October, Thursday. day, 16°; night, 11°; rain

3 October, fri

	753 mmHg		80%
	4.8 m/s		+17

3 October, Friday. day, 16°; night, 10°; partly cloudy

4 October, sat

	753 mmHg		81%
	4.8 m/s		+16

4 October, Saturday. day, 16°; night, 11°; overcast

Average data for 10 years

Watertown September

13

sunny days

11

days with precipitation

6

cloudy days

13 sunny days; 11 days with precipitation; 6 cloudy days;

79

%

air humidity

3.2

m/s

WindS

93

mm of precipitation

(8% of annual average)

+21

°C

Water temperature

air humidity 79%; 93 millimeters of precipitation (8% of annual average); Wind southerly 3.2 Meters per second; Water temperature +21°

Weather graphs for September

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

S

S

S

SW

S

S

S

S

S

S

S

S

S

SW

SW

S

S

S

S

S

S

S

SW

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
Toronto
Ottawa
Montreal
Colchester
Jamaica
Brooklyn
Burlington
Weehawken

Cities with similar weather in September

San Francisco
Podgorica
Vancouver
Boston
Seattle
Balkhash
Albena
San Sebastian
Santander

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

September in Watertown is the sunniest month of the year. In September, the weather in Watertown is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Watertown has 13 sunny, 11 rainy, 5 partly cloudy, and 1 cloudy day in September. The rains are usually heavy.

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