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September weather forecast in Cascais

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

	759 mmHg		89%
	7.7 m/s		+20

31 August, Sunday. day, 19°; night, 18°; partly cloudy

1 September, mon

	759 mmHg		89%
	7.6 m/s		+20

1 September, Monday. day, 19°; night, 18°; clear

2 September, tue

	759 mmHg		88%
	7.3 m/s		+20

2 September, Tuesday. day, 19°; night, 18°; clear

3 September, wed

	759 mmHg		88%
	6.9 m/s		+20

3 September, Wednesday. day, 19°; night, 18°; clear

4 September, thu

	759 mmHg		89%
	7.4 m/s		+20

4 September, Thursday. day, 19°; night, 18°; clear

5 September, fri

	759 mmHg		89%
	7.6 m/s		+20

5 September, Friday. day, 19°; night, 18°; clear

6 September, sat

	759 mmHg		88%
	7.4 m/s		+20

6 September, Saturday. day, 19°; night, 18°; clear

7 September, sun

	759 mmHg		89%
	7.1 m/s		+20

7 September, Sunday. day, 19°; night, 18°; clear

8 September, mon

	759 mmHg		89%
	6.8 m/s		+20

8 September, Monday. day, 19°; night, 18°; clear

9 September, tue

	760 mmHg		91%
	6.9 m/s		+20

9 September, Tuesday. day, 19°; night, 18°; clear

10 September, wed

	760 mmHg		90%
	7.1 m/s		+20

10 September, Wednesday. day, 19°; night, 18°; clear

11 September, thu

	759 mmHg		88%
	7.4 m/s		+20

11 September, Thursday. day, 19°; night, 18°; partly cloudy

12 September, fri

	759 mmHg		86%
	8.1 m/s		+20

12 September, Friday. day, 19°; night, 18°; partly cloudy

13 September, sat

	759 mmHg		85%
	8.1 m/s		+20

13 September, Saturday. day, 19°; night, 18°; partly cloudy

14 September, sun

	759 mmHg		86%
	7.8 m/s		+20

14 September, Sunday. day, 19°; night, 18°; clear

15 September, mon

	759 mmHg		87%
	7.9 m/s		+20

15 September, Monday. day, 19°; night, 18°; clear

16 September, tue

	758 mmHg		88%
	7.8 m/s		+20

16 September, Tuesday. day, 19°; night, 18°; clear

17 September, wed

	758 mmHg		86%
	7.9 m/s		+20

17 September, Wednesday. day, 19°; night, 18°; clear

18 September, thu

	758 mmHg		86%
	8 m/s		+20

18 September, Thursday. day, 19°; night, 18°; partly cloudy

19 September, fri

	759 mmHg		86%
	7.6 m/s		+20

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

20 September, sat

	759 mmHg		87%
	7.3 m/s		+20

20 September, Saturday. day, 19°; night, 18°; clear

21 September, sun

	759 mmHg		87%
	7.6 m/s		+20

21 September, Sunday. day, 19°; night, 18°; rain

22 September, mon

	759 mmHg		86%
	7.1 m/s		+20

22 September, Monday. day, 19°; night, 18°; partly cloudy

23 September, tue

	759 mmHg		87%
	6.9 m/s		+20

23 September, Tuesday. day, 19°; night, 18°; partly cloudy

24 September, wed

	760 mmHg		86%
	7 m/s		+20

24 September, Wednesday. day, 19°; night, 18°; partly cloudy

25 September, thu

	760 mmHg		86%
	7.9 m/s		+20

25 September, Thursday. day, 18°; night, 18°; overcast

26 September, fri

	760 mmHg		84%
	7.5 m/s		+20

26 September, Friday. day, 19°; night, 18°; clear

27 September, sat

	760 mmHg		86%
	7 m/s		+20

27 September, Saturday. day, 19°; night, 18°; partly cloudy

28 September, sun

	760 mmHg		86%
	7.8 m/s		+20

28 September, Sunday. day, 19°; night, 18°; partly cloudy

29 September, mon

	760 mmHg		87%
	7.8 m/s		+20

29 September, Monday. day, 19°; night, 18°; rain

30 September, tue

	760 mmHg		87%
	7.5 m/s		+20

30 September, Tuesday. day, 19°; night, 18°; rain

1 October, wed

	760 mmHg		86%
	7.5 m/s		+20

1 October, Wednesday. day, 19°; night, 18°; partly cloudy

2 October, thu

	760 mmHg		85%
	7.7 m/s		+20

2 October, Thursday. day, 19°; night, 17°; clear

3 October, fri

	760 mmHg		84%
	7.9 m/s		+20

3 October, Friday. day, 18°; night, 17°; clear

4 October, sat

	760 mmHg		85%
	7.5 m/s		+20

4 October, Saturday. day, 18°; night, 17°; clear

Average data for 10 years

Cascais September

16

sunny days

4

days with precipitation

2

cloudy days

16 sunny days; 4 days with precipitation; 2 cloudy days;

87

%

air humidity

5.6

m/s

WindSW

33

mm of precipitation

(6% of annual average)

+20

°C

Water temperature

air humidity 87%; 33 millimeters of precipitation (6% of annual average); Wind south-westerly 5.6 Meters per second; Water temperature +20°

Weather graphs for September

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

W

W

SW

W

W

SW

SW

W

W

W

W

W

SW

W

SW

SW

W

SW

SW

SW

SW

W

SW

W

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

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Lisbon
Porto
Seville
Cadiz
Faro
Setúbal
Felgueiras
Figueira da foz
Aveiro

Cities with similar weather in September

The Sunny Beach
Marseilles
Nesebar
Sveti Vlas
Cannes
Pula
Sozopol
Primorsko
Poreč

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

In September, the weather in Cascais is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, Cascais has 16 sunny, 9 partly cloudy, 4 rainy, and 1 cloudy day in September. The rains are usually light.

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