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September weather forecast in Northbrook

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		71%
	4.8 m/s		+21

31 August, Sunday. day, 25°; night, 18°; clear

1 September, mon

	743 mmHg		72%
	4.6 m/s		+21

1 September, Monday. day, 25°; night, 19°; clear

2 September, tue

	743 mmHg		71%
	4.9 m/s		+21

2 September, Tuesday. day, 26°; night, 19°; clear

3 September, wed

	742 mmHg		70%
	5 m/s		+21

3 September, Wednesday. day, 26°; night, 19°; clear

4 September, thu

	743 mmHg		71%
	4.9 m/s		+21

4 September, Thursday. day, 25°; night, 18°; rain

5 September, fri

	743 mmHg		70%
	5 m/s		+21

5 September, Friday. day, 25°; night, 18°; clear

6 September, sat

	743 mmHg		71%
	5.3 m/s		+21

6 September, Saturday. day, 25°; night, 18°; clear

7 September, sun

	742 mmHg		72%
	5.5 m/s		+20

7 September, Sunday. day, 25°; night, 18°; rain

8 September, mon

	742 mmHg		73%
	5.4 m/s		+20

8 September, Monday. day, 23°; night, 17°; overcast

9 September, tue

	743 mmHg		75%
	5 m/s		+20

9 September, Tuesday. day, 23°; night, 17°; partly cloudy

10 September, wed

	743 mmHg		73%
	5.2 m/s		+20

10 September, Wednesday. day, 23°; night, 17°; clear

11 September, thu

	743 mmHg		72%
	5.4 m/s		+20

11 September, Thursday. day, 24°; night, 17°; rain

12 September, fri

	742 mmHg		71%
	5.2 m/s		+20

12 September, Friday. day, 23°; night, 16°; rain

13 September, sat

	742 mmHg		73%
	5.5 m/s		+20

13 September, Saturday. day, 23°; night, 16°; rain

14 September, sun

	743 mmHg		71%
	5 m/s		+20

14 September, Sunday. day, 23°; night, 16°; clear

15 September, mon

	744 mmHg		71%
	5.2 m/s		+19

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

16 September, tue

	744 mmHg		71%
	5.1 m/s		+19

16 September, Tuesday. day, 22°; night, 15°; clear

17 September, wed

	743 mmHg		70%
	5 m/s		+19

17 September, Wednesday. day, 23°; night, 16°; clear

18 September, thu

	743 mmHg		71%
	5.1 m/s		+19

18 September, Thursday. day, 23°; night, 16°; clear

19 September, fri

	742 mmHg		72%
	5.7 m/s		+19

19 September, Friday. day, 23°; night, 16°; rain

20 September, sat

	742 mmHg		73%
	5.5 m/s		+19

20 September, Saturday. day, 23°; night, 16°; rain

21 September, sun

	742 mmHg		71%
	5.8 m/s		+19

21 September, Sunday. day, 22°; night, 16°; partly cloudy

22 September, mon

	743 mmHg		72%
	5.6 m/s		+19

22 September, Monday. day, 21°; night, 15°; rain

23 September, tue

	743 mmHg		71%
	5.2 m/s		+19

23 September, Tuesday. day, 21°; night, 14°; partly cloudy

24 September, wed

	743 mmHg		71%
	5.5 m/s		+18

24 September, Wednesday. day, 21°; night, 14°; overcast

25 September, thu

	742 mmHg		71%
	5.5 m/s		+18

25 September, Thursday. day, 21°; night, 14°; partly cloudy

26 September, fri

	741 mmHg		70%
	5.6 m/s		+18

26 September, Friday. day, 21°; night, 14°; clear

27 September, sat

	740 mmHg		71%
	5.8 m/s		+18

27 September, Saturday. day, 20°; night, 14°; partly cloudy

28 September, sun

	741 mmHg		74%
	5.9 m/s		+18

28 September, Sunday. day, 19°; night, 13°; rain

29 September, mon

	743 mmHg		72%
	6.3 m/s		+18

29 September, Monday. day, 19°; night, 12°; partly cloudy

30 September, tue

	743 mmHg		70%
	6.1 m/s		+17

30 September, Tuesday. day, 20°; night, 12°; clear

1 October, wed

	743 mmHg		69%
	6.2 m/s		+17

1 October, Wednesday. day, 19°; night, 13°; clear

2 October, thu

	743 mmHg		72%
	6 m/s		+16

2 October, Thursday. day, 19°; night, 13°; clear

3 October, fri

	742 mmHg		73%
	6.1 m/s		+16

3 October, Friday. day, 19°; night, 13°; rain

4 October, sat

	743 mmHg		73%
	6.1 m/s		+16

4 October, Saturday. day, 19°; night, 13°; rain

Average data for 10 years

Northbrook September

13

sunny days

9

days with precipitation

4

cloudy days

13 sunny days; 9 days with precipitation; 4 cloudy days;

72

%

air humidity

3.8

m/s

WindS

75

mm of precipitation

(8% of annual average)

+19

°C

Water temperature

air humidity 72%; 75 millimeters of precipitation (8% of annual average); Wind southerly 3.8 Meters per second; Water temperature +19°

Weather graphs for September

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

SE

S

S

S

S

S

S

SE

SE

S

S

S

S

S

S

S

S

S

S

S

SW

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

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Chicago
Indianapolis
Michigan City
Wisconsin Dells
Appleton
Dixon
Ottawa
Iowa City
Washington

Cities with similar weather in September

Suhum
Burgas
Varna
Tivat
Podgorica
Toronto
The Golden Sands
Pomorie
Genoa

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

September in Northbrook is the sunniest month of the year. In September, the weather in Northbrook is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Northbrook has 13 sunny, 9 rainy, 6 partly cloudy, and 2 cloudy days in September. The rains are usually heavy.

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