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September weather forecast in Duncan

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

	743 mmHg		69%
	2.6 m/s		+13

31 August, Sunday. day, 22°; night, 13°; rain

1 September, mon

	743 mmHg		68%
	2.6 m/s		+13

1 September, Monday. day, 22°; night, 12°; clear

2 September, tue

	743 mmHg		68%
	2.5 m/s		+13

2 September, Tuesday. day, 22°; night, 12°; partly cloudy

3 September, wed

	743 mmHg		67%
	2.4 m/s		+13

3 September, Wednesday. day, 22°; night, 13°; clear

4 September, thu

	744 mmHg		70%
	2.5 m/s		+13

4 September, Thursday. day, 22°; night, 12°; partly cloudy

5 September, fri

	744 mmHg		68%
	2.5 m/s		+13

5 September, Friday. day, 22°; night, 12°; clear

6 September, sat

	744 mmHg		70%
	2.6 m/s		+13

6 September, Saturday. day, 22°; night, 12°; clear

7 September, sun

	744 mmHg		70%
	2.8 m/s		+13

7 September, Sunday. day, 22°; night, 12°; clear

8 September, mon

	743 mmHg		70%
	2.7 m/s		+13

8 September, Monday. day, 22°; night, 12°; clear

9 September, tue

	743 mmHg		71%
	2.8 m/s		+13

9 September, Tuesday. day, 22°; night, 13°; partly cloudy

10 September, wed

	743 mmHg		70%
	2.7 m/s		+13

10 September, Wednesday. day, 22°; night, 12°; clear

11 September, thu

	744 mmHg		68%
	2.6 m/s		+13

11 September, Thursday. day, 22°; night, 12°; clear

12 September, fri

	744 mmHg		71%
	2.6 m/s		+13

12 September, Friday. day, 22°; night, 12°; clear

13 September, sat

	743 mmHg		70%
	2.4 m/s		+13

13 September, Saturday. day, 22°; night, 12°; clear

14 September, sun

	742 mmHg		72%
	2.5 m/s		+13

14 September, Sunday. day, 21°; night, 12°; partly cloudy

15 September, mon

	741 mmHg		74%
	2.6 m/s		+13

15 September, Monday. day, 20°; night, 12°; rain

16 September, tue

	742 mmHg		75%
	2.6 m/s		+13

16 September, Tuesday. day, 20°; night, 11°; rain

17 September, wed

	742 mmHg		77%
	3 m/s		+13

17 September, Wednesday. day, 19°; night, 11°; rain

18 September, thu

	742 mmHg		78%
	2.9 m/s		+13

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

19 September, fri

	743 mmHg		77%
	2.7 m/s		+13

19 September, Friday. day, 19°; night, 12°; rain

20 September, sat

	744 mmHg		75%
	2.7 m/s		+13

20 September, Saturday. day, 19°; night, 10°; partly cloudy

21 September, sun

	744 mmHg		73%
	2.7 m/s		+13

21 September, Sunday. day, 19°; night, 10°; partly cloudy

22 September, mon

	743 mmHg		71%
	2.8 m/s		+13

22 September, Monday. day, 19°; night, 10°; clear

23 September, tue

	744 mmHg		74%
	2.7 m/s		+13

23 September, Tuesday. day, 19°; night, 10°; rain

24 September, wed

	744 mmHg		75%
	2.8 m/s		+13

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

25 September, thu

	743 mmHg		78%
	3.1 m/s		+13

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

26 September, fri

	744 mmHg		77%
	3.3 m/s		+13

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

27 September, sat

	744 mmHg		75%
	2.9 m/s		+13

27 September, Saturday. day, 19°; night, 10°; clear

28 September, sun

	743 mmHg		75%
	3 m/s		+13

28 September, Sunday. day, 19°; night, 10°; clear

29 September, mon

	742 mmHg		75%
	3.1 m/s		+13

29 September, Monday. day, 18°; night, 10°; rain

30 September, tue

	742 mmHg		75%
	3.3 m/s		+13

30 September, Tuesday. day, 17°; night, 9°; clear

1 October, wed

	743 mmHg		75%
	2.8 m/s		+13

1 October, Wednesday. day, 17°; night, 9°; clear

2 October, thu

	744 mmHg		77%
	2.9 m/s		+12

2 October, Thursday. day, 16°; night, 9°; clear

3 October, fri

	744 mmHg		78%
	2.9 m/s		+12

3 October, Friday. day, 16°; night, 8°; clear

4 October, sat

	743 mmHg		77%
	2.9 m/s		+12

4 October, Saturday. day, 16°; night, 8°; clear

Average data for 10 years

Duncan September

14

sunny days

9

days with precipitation

5

cloudy days

14 sunny days; 9 days with precipitation; 5 cloudy days;

73

%

air humidity

1.7

m/s

WindSW

71

mm of precipitation

(5% of annual average)

+13

°C

Water temperature

air humidity 73%; 71 millimeters of precipitation (5% of annual average); Wind south-westerly 1.7 Meters per second; Water temperature +13°

Weather graphs for September

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

SW

SW

SW

SW

SW

S

SW

SW

SW

SW

SW

SW

SW

SW

S

S

S

S

S

SW

SW

S

S

S

SW

SW

SW

SW

SW

SW

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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27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Vancouver
Seattle
Portland
Salem
Victoria
Vancouver
Mount Ranier National Park
Courtenay
Tofino

Cities with similar weather in September

Riga
Stockholm
Yurmala
Palanga
Copenhagen
Capetown
Gdansk
Looe
Klaipeda

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

In September, the weather in Duncan is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Duncan has 14 sunny, 9 rainy, and 7 partly cloudy days in September. The rains are usually heavy.

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