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September weather forecast in Ketchikan

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

	750 mmHg		89%
	5 m/s		+14

31 August, Sunday. day, 14°; night, 11°; rain

1 September, mon

	750 mmHg		88%
	4.9 m/s		+14

1 September, Monday. day, 14°; night, 11°; partly cloudy

2 September, tue

	750 mmHg		88%
	5 m/s		+14

2 September, Tuesday. day, 14°; night, 11°; rain

3 September, wed

	751 mmHg		88%
	4.19 m/s		+14

3 September, Wednesday. day, 14°; night, 11°; overcast

4 September, thu

	752 mmHg		88%
	4.1 m/s		+14

4 September, Thursday. day, 14°; night, 11°; rain

5 September, fri

	751 mmHg		87%
	4.4 m/s		+14

5 September, Friday. day, 14°; night, 11°; rain

6 September, sat

	751 mmHg		89%
	4.69 m/s		+14

6 September, Saturday. day, 14°; night, 12°; rain

7 September, sun

	751 mmHg		89%
	5.1 m/s		+14

7 September, Sunday. day, 14°; night, 11°; rain

8 September, mon

	751 mmHg		89%
	5 m/s		+14

8 September, Monday. day, 14°; night, 11°; rain

9 September, tue

	750 mmHg		86%
	4.9 m/s		+13

9 September, Tuesday. day, 14°; night, 11°; overcast

10 September, wed

	750 mmHg		85%
	5.3 m/s		+14

10 September, Wednesday. day, 14°; night, 11°; partly cloudy

11 September, thu

	751 mmHg		86%
	5.1 m/s		+14

11 September, Thursday. day, 14°; night, 11°; rain

12 September, fri

	752 mmHg		87%
	4.4 m/s		+14

12 September, Friday. day, 14°; night, 11°; partly cloudy

13 September, sat

	752 mmHg		86%
	4.8 m/s		+14

13 September, Saturday. day, 14°; night, 11°; clear

14 September, sun

	750 mmHg		85%
	4.5 m/s		+14

14 September, Sunday. day, 14°; night, 10°; clear

15 September, mon

	750 mmHg		84%
	4.3 m/s		+13

15 September, Monday. day, 14°; night, 10°; clear

16 September, tue

	749 mmHg		85%
	4.69 m/s		+13

16 September, Tuesday. day, 14°; night, 10°; clear

17 September, wed

	747 mmHg		86%
	5.3 m/s		+12

17 September, Wednesday. day, 13°; night, 10°; rain

18 September, thu

	747 mmHg		88%
	5.2 m/s		+12

18 September, Thursday. day, 13°; night, 10°; rain

19 September, fri

	749 mmHg		87%
	4.9 m/s		+13

19 September, Friday. day, 13°; night, 10°; rain

20 September, sat

	751 mmHg		86%
	5.7 m/s		+12

20 September, Saturday. day, 13°; night, 10°; rain

21 September, sun

	750 mmHg		88%
	6 m/s		+11

21 September, Sunday. day, 13°; night, 10°; rain

22 September, mon

	749 mmHg		87%
	6.1 m/s		+11

22 September, Monday. day, 12°; night, 10°; rain

23 September, tue

	748 mmHg		88%
	6.5 m/s		+11

23 September, Tuesday. day, 12°; night, 10°; rain

24 September, wed

	748 mmHg		90%
	6.4 m/s		+12

24 September, Wednesday. day, 12°; night, 10°; rain

25 September, thu

	748 mmHg		89%
	5.4 m/s		+11

25 September, Thursday. day, 12°; night, 10°; rain

26 September, fri

	749 mmHg		89%
	5.4 m/s		+11

26 September, Friday. day, 12°; night, 10°; rain

27 September, sat

	749 mmHg		90%
	5.7 m/s		+11

27 September, Saturday. day, 12°; night, 10°; rain

28 September, sun

	749 mmHg		88%
	5.7 m/s		+11

28 September, Sunday. day, 11°; night, 9°; rain

29 September, mon

	749 mmHg		86%
	5.5 m/s		+11

29 September, Monday. day, 11°; night, 9°; rain

30 September, tue

	749 mmHg		86%
	5.9 m/s		+11

30 September, Tuesday. day, 11°; night, 9°; rain

1 October, wed

	750 mmHg		84%
	5.8 m/s		+11

1 October, Wednesday. day, 11°; night, 8°; rain

2 October, thu

	751 mmHg		83%
	5.2 m/s		+11

2 October, Thursday. day, 11°; night, 8°; clear

3 October, fri

	751 mmHg		85%
	4.6 m/s		+11

3 October, Friday. day, 11°; night, 8°; partly cloudy

4 October, sat

	751 mmHg		85%
	5.1 m/s		+11

4 October, Saturday. day, 11°; night, 8°; partly cloudy

Average data for 10 years

Ketchikan September

4

sunny days

21

days with precipitation

17

cloudy days

4 sunny days; 21 days with precipitation; 17 cloudy days;

87

%

air humidity

3.3

m/s

WindS

340

mm of precipitation

(11% of annual average)

+13

°C

Water temperature

air humidity 87%; 340 millimeters of precipitation (11% of annual average); Wind southerly 3.3 Meters per second; Water temperature +13°

Weather graphs for September

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

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S

SW

S

S

S

S

S

S

S

S

SW

SW

SW

SW

S

S

S

SW

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

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28

29

30

Daytime temperature

Night-time temperature

Cities near you

Wrangell
Juneau
Sitka
Courtenay
Tofino
Skagway
Whitehorse
Prince Rupert
Smithers

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Oslo
Yurmala
Palanga
Dublin
Buenos Aires

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

In September, the weather in Ketchikan is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Ketchikan has 21 rainy, 4 sunny, 3 partly cloudy, and 2 cloudy days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Ketchikan.

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