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September weather forecast in Bar Harbor

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

	759 mmHg		79%
	5.1 m/s		+18

31 August, Sunday. day, 21°; night, 15°; clear

1 September, mon

	760 mmHg		77%
	4.9 m/s		+18

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

2 September, tue

	761 mmHg		79%
	4.9 m/s		+18

2 September, Tuesday. day, 20°; night, 14°; clear

3 September, wed

	760 mmHg		82%
	5 m/s		+18

3 September, Wednesday. day, 20°; night, 14°; partly cloudy

4 September, thu

	759 mmHg		82%
	4.9 m/s		+18

4 September, Thursday. day, 21°; night, 15°; rain

5 September, fri

	760 mmHg		78%
	4.9 m/s		+17

5 September, Friday. day, 20°; night, 14°; clear

6 September, sat

	761 mmHg		79%
	4.8 m/s		+16

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

7 September, sun

	760 mmHg		82%
	5 m/s		+17

7 September, Sunday. day, 20°; night, 14°; partly cloudy

8 September, mon

	759 mmHg		84%
	4.9 m/s		+17

8 September, Monday. day, 20°; night, 15°; overcast

9 September, tue

	760 mmHg		82%
	5 m/s		+17

9 September, Tuesday. day, 20°; night, 14°; overcast

10 September, wed

	761 mmHg		81%
	4.9 m/s		+16

10 September, Wednesday. day, 19°; night, 14°; partly cloudy

11 September, thu

	761 mmHg		80%
	5.2 m/s		+17

11 September, Thursday. day, 19°; night, 13°; rain

12 September, fri

	761 mmHg		80%
	5.2 m/s		+16

12 September, Friday. day, 19°; night, 13°; clear

13 September, sat

	761 mmHg		83%
	4.8 m/s		+16

13 September, Saturday. day, 19°; night, 13°; clear

14 September, sun

	760 mmHg		84%
	5 m/s		+16

14 September, Sunday. day, 19°; night, 14°; overcast

15 September, mon

	760 mmHg		84%
	5.2 m/s		+16

15 September, Monday. day, 18°; night, 13°; rain

16 September, tue

	761 mmHg		82%
	5.4 m/s		+16

16 September, Tuesday. day, 18°; night, 13°; rain

17 September, wed

	761 mmHg		80%
	5.1 m/s		+16

17 September, Wednesday. day, 18°; night, 12°; clear

18 September, thu

	760 mmHg		82%
	4.9 m/s		+15

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

19 September, fri

	762 mmHg		79%
	5.2 m/s		+15

19 September, Friday. day, 17°; night, 11°; clear

20 September, sat

	761 mmHg		82%
	5.3 m/s		+16

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

21 September, sun

	761 mmHg		81%
	5.1 m/s		+16

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

22 September, mon

	761 mmHg		82%
	5.6 m/s		+16

22 September, Monday. day, 18°; night, 12°; overcast

23 September, tue

	759 mmHg		80%
	5.5 m/s		+15

23 September, Tuesday. day, 18°; night, 12°; rain

24 September, wed

	761 mmHg		78%
	5.2 m/s		+16

24 September, Wednesday. day, 17°; night, 11°; clear

25 September, thu

	762 mmHg		80%
	5.4 m/s		+15

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

26 September, fri

	761 mmHg		83%
	5 m/s		+16

26 September, Friday. day, 17°; night, 12°; overcast

27 September, sat

	761 mmHg		84%
	5.1 m/s		+16

27 September, Saturday. day, 17°; night, 12°; rain

28 September, sun

	760 mmHg		86%
	5.4 m/s		+15

28 September, Sunday. day, 17°; night, 12°; rain

29 September, mon

	760 mmHg		82%
	5.9 m/s		+15

29 September, Monday. day, 16°; night, 11°; rain

30 September, tue

	761 mmHg		81%
	5.5 m/s		+14

30 September, Tuesday. day, 16°; night, 10°; clear

1 October, wed

	761 mmHg		82%
	5.1 m/s		+14

1 October, Wednesday. day, 16°; night, 10°; partly cloudy

2 October, thu

	760 mmHg		81%
	5.1 m/s		+14

2 October, Thursday. day, 16°; night, 10°; overcast

3 October, fri

	762 mmHg		79%
	5.1 m/s		+15

3 October, Friday. day, 16°; night, 10°; clear

4 October, sat

	763 mmHg		81%
	5.3 m/s		+14

4 October, Saturday. day, 15°; night, 10°; partly cloudy

Average data for 10 years

Bar Harbor September

11

sunny days

8

days with precipitation

8

cloudy days

11 sunny days; 8 days with precipitation; 8 cloudy days;

81

%

air humidity

3.6

m/s

WindSW

101

mm of precipitation

(9% of annual average)

+16

°C

Water temperature

air humidity 81%; 101 millimeters of precipitation (9% of annual average); Wind south-westerly 3.6 Meters per second; Water temperature +16°

Weather graphs for September

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

SW

S

SW

SW

SW

SW

S

SW

S

SW

SW

SW

SW

SW

SW

SW

SW

SW

S

S

SW

S

SW

SW

SW

S

SW

S

SW

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

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28

29

30

Daytime temperature

Night-time temperature

Cities near you

Boston
Quebec
Saint John
Portland
Berlin
Bangor
New Bedford
Saint Johnsbury
Hillsborough

Cities with similar weather in September

Copenhagen
Vancouver
Gdansk
Looe
Montreal
Bruges
Perth
Liverpool
Brighton

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

September in Bar Harbor is the sunniest month of the year. In September, the weather in Bar Harbor is typically warm. Average daily high temperature in September is about 18 degrees above zero. On average, Bar Harbor has 11 sunny, 8 rainy, 6 partly cloudy, and 5 cloudy days in September. The rains are usually heavy.

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