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September weather forecast. Rock Island County: Yandex

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		73%
	4.3 m/s

31 August, Sunday. day, 27°; night, 17°; clear

1 September, mon

	743 mmHg		72%
	4.6 m/s

1 September, Monday. day, 27°; night, 17°; clear

2 September, tue

	743 mmHg		72%
	4.4 m/s

2 September, Tuesday. day, 27°; night, 17°; clear

3 September, wed

	743 mmHg		71%
	4.6 m/s

3 September, Wednesday. day, 27°; night, 17°; rain

4 September, thu

	743 mmHg		71%
	4.6 m/s

4 September, Thursday. day, 27°; night, 17°; clear

5 September, fri

	744 mmHg		71%
	5.1 m/s

5 September, Friday. day, 27°; night, 17°; clear

6 September, sat

	743 mmHg		70%
	5.1 m/s

6 September, Saturday. day, 26°; night, 17°; clear

7 September, sun

	742 mmHg		71%
	5.2 m/s

7 September, Sunday. day, 26°; night, 17°; partly cloudy

8 September, mon

	743 mmHg		71%
	5 m/s

8 September, Monday. day, 25°; night, 15°; rain

9 September, tue

	743 mmHg		73%
	4.6 m/s

9 September, Tuesday. day, 24°; night, 15°; clear

10 September, wed

	744 mmHg		72%
	5.2 m/s

10 September, Wednesday. day, 25°; night, 15°; rain

11 September, thu

	744 mmHg		71%
	5.2 m/s

11 September, Thursday. day, 25°; night, 15°; partly cloudy

12 September, fri

	743 mmHg		71%
	5.1 m/s

12 September, Friday. day, 25°; night, 15°; partly cloudy

13 September, sat

	743 mmHg		71%
	5.1 m/s

13 September, Saturday. day, 24°; night, 15°; clear

14 September, sun

	743 mmHg		70%
	4.8 m/s

14 September, Sunday. day, 24°; night, 14°; partly cloudy

15 September, mon

	744 mmHg		69%
	4.8 m/s

15 September, Monday. day, 24°; night, 14°; overcast

16 September, tue

	744 mmHg		69%
	4.9 m/s

16 September, Tuesday. day, 24°; night, 14°; clear

17 September, wed

	743 mmHg		69%
	4.9 m/s

17 September, Wednesday. day, 25°; night, 14°; clear

18 September, thu

	743 mmHg		70%
	5 m/s

18 September, Thursday. day, 25°; night, 15°; partly cloudy

19 September, fri

	742 mmHg		71%
	6 m/s

19 September, Friday. day, 25°; night, 16°; rain

20 September, sat

	742 mmHg		72%
	5.5 m/s

20 September, Saturday. day, 25°; night, 15°; rain

21 September, sun

	742 mmHg		69%
	6.2 m/s

21 September, Sunday. day, 23°; night, 14°; rain

22 September, mon

	743 mmHg		70%
	5.4 m/s

22 September, Monday. day, 22°; night, 13°; rain

23 September, tue

	744 mmHg		69%
	5.1 m/s

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

24 September, wed

	743 mmHg		70%
	5.3 m/s

24 September, Wednesday. day, 22°; night, 13°; overcast

25 September, thu

	742 mmHg		70%
	4.9 m/s

25 September, Thursday. day, 23°; night, 13°; rain

26 September, fri

	742 mmHg		69%
	5.3 m/s

26 September, Friday. day, 23°; night, 12°; clear

27 September, sat

	741 mmHg		68%
	5.5 m/s

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

28 September, sun

	742 mmHg		70%
	5.2 m/s

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

29 September, mon

	744 mmHg		68%
	5.9 m/s

29 September, Monday. day, 21°; night, 11°; clear

30 September, tue

	743 mmHg		65%
	6 m/s

30 September, Tuesday. day, 22°; night, 12°; clear

1 October, wed

	743 mmHg		66%
	5.8 m/s

1 October, Wednesday. day, 22°; night, 12°; clear

2 October, thu

	743 mmHg		70%
	5.7 m/s

2 October, Thursday. day, 21°; night, 12°; rain

3 October, fri

	743 mmHg		70%
	6 m/s

3 October, Friday. day, 21°; night, 11°; rain

4 October, sat

	744 mmHg		67%
	5.8 m/s

4 October, Saturday. day, 20°; night, 11°; partly cloudy

Average data for 10 years

Rock Island County September

14

sunny days

8

days with precipitation

4

cloudy days

14 sunny days; 8 days with precipitation; 4 cloudy days;

70

%

air humidity

3.5

m/s

WindS

85

mm of precipitation

(9% of annual average)

air humidity 70%; 85 millimeters of precipitation (9% of annual average); Wind southerly 3.5 Meters per second

Weather graphs for September

TemperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SE

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

SE

S

S

S

SW

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

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29

30

Daytime temperature

Night-time temperature

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

September in Rock Island County is the sunniest month of the year. In September, the weather in Rock Island County is typically warm. Average daily high temperature in September is about 24 degrees above zero. On average, Rock Island County has 14 sunny, 8 rainy, 6 partly cloudy, and 2 cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Rock Island County.

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