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September weather forecast in Coos Bay

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

	762 mmHg		82%
	6 m/s		+16

31 August, Sunday. day, 19°; night, 13°; partly cloudy

1 September, mon

	762 mmHg		79%
	6.1 m/s		+16

1 September, Monday. day, 19°; night, 13°; clear

2 September, tue

	761 mmHg		79%
	6 m/s		+17

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

3 September, wed

	762 mmHg		80%
	5.9 m/s		+16

3 September, Wednesday. day, 19°; night, 13°; clear

4 September, thu

	762 mmHg		80%
	6 m/s		+16

4 September, Thursday. day, 19°; night, 13°; clear

5 September, fri

	763 mmHg		79%
	6 m/s		+16

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

6 September, sat

	763 mmHg		80%
	6.1 m/s		+16

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

7 September, sun

	763 mmHg		81%
	6 m/s		+16

7 September, Sunday. day, 19°; night, 13°; clear

8 September, mon

	762 mmHg		79%
	6.3 m/s		+16

8 September, Monday. day, 19°; night, 13°; clear

9 September, tue

	761 mmHg		77%
	6.3 m/s		+16

9 September, Tuesday. day, 20°; night, 14°; partly cloudy

10 September, wed

	762 mmHg		80%
	6.1 m/s		+16

10 September, Wednesday. day, 20°; night, 13°; clear

11 September, thu

	762 mmHg		81%
	5.8 m/s		+16

11 September, Thursday. day, 19°; night, 13°; partly cloudy

12 September, fri

	762 mmHg		80%
	5.7 m/s		+15

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

13 September, sat

	761 mmHg		80%
	6 m/s		+15

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

14 September, sun

	761 mmHg		82%
	6.1 m/s		+15

14 September, Sunday. day, 19°; night, 13°; partly cloudy

15 September, mon

	761 mmHg		83%
	6 m/s		+16

15 September, Monday. day, 18°; night, 13°; partly cloudy

16 September, tue

	762 mmHg		84%
	5.7 m/s		+15

16 September, Tuesday. day, 17°; night, 13°; rain

17 September, wed

	762 mmHg		84%
	5.9 m/s		+16

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

18 September, thu

	762 mmHg		84%
	5.9 m/s		+15

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

19 September, fri

	762 mmHg		82%
	6 m/s		+15

19 September, Friday. day, 18°; night, 13°; rain

20 September, sat

	763 mmHg		80%
	6.1 m/s		+16

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

21 September, sun

	762 mmHg		78%
	5.8 m/s		+16

21 September, Sunday. day, 19°; night, 13°; partly cloudy

22 September, mon

	762 mmHg		78%
	5.8 m/s		+16

22 September, Monday. day, 19°; night, 13°; clear

23 September, tue

	762 mmHg		78%
	6.1 m/s		+16

23 September, Tuesday. day, 19°; night, 12°; partly cloudy

24 September, wed

	762 mmHg		79%
	6.1 m/s		+16

24 September, Wednesday. day, 19°; night, 13°; partly cloudy

25 September, thu

	762 mmHg		80%
	6.3 m/s		+16

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

26 September, fri

	763 mmHg		78%
	6.6 m/s		+16

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

27 September, sat

	763 mmHg		80%
	6.4 m/s		+16

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

28 September, sun

	762 mmHg		80%
	5.9 m/s		+16

28 September, Sunday. day, 19°; night, 12°; partly cloudy

29 September, mon

	762 mmHg		81%
	5.6 m/s		+16

29 September, Monday. day, 18°; night, 12°; partly cloudy

30 September, tue

	762 mmHg		83%
	5.8 m/s		+15

30 September, Tuesday. day, 17°; night, 12°; partly cloudy

1 October, wed

	762 mmHg		81%
	5.8 m/s		+15

1 October, Wednesday. day, 17°; night, 12°; clear

2 October, thu

	763 mmHg		81%
	6.2 m/s		+15

2 October, Thursday. day, 17°; night, 12°; clear

3 October, fri

	762 mmHg		80%
	6.3 m/s		+15

3 October, Friday. day, 17°; night, 12°; rain

4 October, sat

	762 mmHg		81%
	6 m/s		+15

4 October, Saturday. day, 17°; night, 12°; clear

Average data for 10 years

Coos Bay September

15

sunny days

5

days with precipitation

3

cloudy days

15 sunny days; 5 days with precipitation; 3 cloudy days;

80

%

air humidity

3.9

m/s

WindS

39

mm of precipitation

(3% of annual average)

+16

°C

Water temperature

air humidity 80%; 39 millimeters of precipitation (3% of annual average); Wind southerly 3.9 Meters per second; Water temperature +16°

Weather graphs for September

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

SW

S

SW

SW

SW

S

SW

S

SW

SW

S

SW

S

SW

SW

SW

SW

S

S

S

S

S

S

S

S

SE

S

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

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Portland
Salem
Vancouver
Eugene
Aberdeen
Woodburn
Eureka
Redding
Klamath Falls

Cities with similar weather in September

Sydney
Vancouver
Montreal
Bruges
Perth
Liverpool
Brighton
Rostock
Lubek

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

In September, the weather in Coos Bay is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, Coos Bay has 15 sunny, 10 partly cloudy, and 5 rainy days in September. The rains are usually moderate.

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