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September weather forecast in Lake Forest

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		70%
	3.6 m/s		+24

31 August, Sunday. day, 28°; night, 19°; clear

1 September, mon

	750 mmHg		69%
	3.4 m/s		+23

1 September, Monday. day, 28°; night, 19°; clear

2 September, tue

	750 mmHg		70%
	3.5 m/s		+23

2 September, Tuesday. day, 29°; night, 19°; clear

3 September, wed

	750 mmHg		70%
	3.9 m/s		+23

3 September, Wednesday. day, 29°; night, 19°; clear

4 September, thu

	750 mmHg		70%
	3.7 m/s		+23

4 September, Thursday. day, 29°; night, 19°; clear

5 September, fri

	750 mmHg		69%
	3.6 m/s		+23

5 September, Friday. day, 29°; night, 19°; clear

6 September, sat

	750 mmHg		68%
	3.5 m/s		+23

6 September, Saturday. day, 29°; night, 19°; clear

7 September, sun

	750 mmHg		70%
	3.6 m/s		+23

7 September, Sunday. day, 29°; night, 19°; clear

8 September, mon

	750 mmHg		70%
	3.7 m/s		+23

8 September, Monday. day, 28°; night, 19°; clear

9 September, tue

	750 mmHg		69%
	3.7 m/s		+23

9 September, Tuesday. day, 27°; night, 18°; clear

10 September, wed

	750 mmHg		71%
	3.7 m/s		+23

10 September, Wednesday. day, 27°; night, 18°; clear

11 September, thu

	751 mmHg		70%
	3.7 m/s		+23

11 September, Thursday. day, 27°; night, 18°; clear

12 September, fri

	751 mmHg		71%
	3.7 m/s		+23

12 September, Friday. day, 27°; night, 18°; clear

13 September, sat

	750 mmHg		71%
	3.6 m/s		+22

13 September, Saturday. day, 27°; night, 18°; clear

14 September, sun

	750 mmHg		71%
	3.5 m/s		+22

14 September, Sunday. day, 27°; night, 17°; clear

15 September, mon

	751 mmHg		72%
	3.6 m/s		+23

15 September, Monday. day, 27°; night, 18°; clear

16 September, tue

	751 mmHg		71%
	3.5 m/s		+23

16 September, Tuesday. day, 26°; night, 17°; clear

17 September, wed

	751 mmHg		72%
	3.4 m/s		+22

17 September, Wednesday. day, 26°; night, 17°; clear

18 September, thu

	750 mmHg		73%
	3.5 m/s		+22

18 September, Thursday. day, 26°; night, 17°; clear

19 September, fri

	750 mmHg		73%
	3.6 m/s		+22

19 September, Friday. day, 26°; night, 17°; clear

20 September, sat

	750 mmHg		73%
	3.6 m/s		+22

20 September, Saturday. day, 25°; night, 17°; rain

21 September, sun

	751 mmHg		74%
	3.6 m/s		+22

21 September, Sunday. day, 26°; night, 17°; clear

22 September, mon

	751 mmHg		72%
	3.7 m/s		+23

22 September, Monday. day, 26°; night, 17°; partly cloudy

23 September, tue

	751 mmHg		71%
	3.5 m/s		+23

23 September, Tuesday. day, 27°; night, 16°; clear

24 September, wed

	751 mmHg		70%
	3.4 m/s		+23

24 September, Wednesday. day, 27°; night, 17°; clear

25 September, thu

	751 mmHg		70%
	3.6 m/s		+23

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

26 September, fri

	751 mmHg		71%
	3.5 m/s		+24

26 September, Friday. day, 26°; night, 17°; partly cloudy

27 September, sat

	751 mmHg		72%
	3.4 m/s		+23

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

28 September, sun

	751 mmHg		72%
	3.4 m/s		+23

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

29 September, mon

	751 mmHg		70%
	3.4 m/s		+23

29 September, Monday. day, 26°; night, 17°; partly cloudy

30 September, tue

	751 mmHg		69%
	3.5 m/s		+23

30 September, Tuesday. day, 27°; night, 16°; clear

1 October, wed

	751 mmHg		69%
	3.4 m/s		+23

1 October, Wednesday. day, 26°; night, 17°; clear

2 October, thu

	751 mmHg		69%
	3.4 m/s		+22

2 October, Thursday. day, 26°; night, 17°; clear

3 October, fri

	751 mmHg		71%
	3.5 m/s		+21

3 October, Friday. day, 25°; night, 16°; clear

4 October, sat

	751 mmHg		71%
	3.6 m/s		+21

4 October, Saturday. day, 25°; night, 16°; clear

Average data for 10 years

Lake Forest September

25

sunny days

1

day with precipitation

4

cloudy days

25 sunny days; 1 day with precipitation; 4 cloudy days;

71

%

air humidity

1.7

m/s

WindS

6

mm of precipitation

(2% of annual average)

+23

°C

Water temperature

air humidity 71%; 6 millimeters of precipitation (2% of annual average); Wind southerly 1.7 Meters per second; Water temperature +23°

Weather graphs for September

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

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S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

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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25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Los Angeles
Las Vegas
San Diego
Yuma
Santa Monica
Beverly Hills
Mexicali
Santa Barbara
Glendale

Cities with similar weather in September

Barcelona
Rome
Batumi
Heraklion
Nice
Salou
Malaga
Rio de Janeiro
Pisa

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

In September, the weather in Lake Forest is typically warm. Average daily high temperature in September is about 27 degrees above zero. On average, Lake Forest has 25 sunny, 4 partly cloudy, and 1 rainy day in September. The rains are usually light.

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