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December 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

30 November, sun

	761 mmHg		78%
	9.3 m/s		+16

30 November, Sunday. day, 15°; night, 13°; rain

1 December, mon

	761 mmHg		76%
	9.2 m/s		+16

1 December, Monday. day, 15°; night, 13°; partly cloudy

2 December, tue

	762 mmHg		74%
	8.8 m/s		+16

2 December, Tuesday. day, 14°; night, 13°; clear

3 December, wed

	762 mmHg		74%
	8.5 m/s		+16

3 December, Wednesday. day, 15°; night, 13°; partly cloudy

4 December, thu

	761 mmHg		77%
	8.89 m/s		+16

4 December, Thursday. day, 15°; night, 13°; rain

5 December, fri

	762 mmHg		78%
	8.39 m/s		+16

5 December, Friday. day, 15°; night, 13°; clear

6 December, sat

	763 mmHg		77%
	8.3 m/s		+16

6 December, Saturday. day, 15°; night, 13°; clear

7 December, sun

	762 mmHg		80%
	8.8 m/s		+16

7 December, Sunday. day, 15°; night, 14°; rain

8 December, mon

	763 mmHg		78%
	8.2 m/s		+16

8 December, Monday. day, 15°; night, 13°; partly cloudy

9 December, tue

	764 mmHg		79%
	8.6 m/s		+16

9 December, Tuesday. day, 15°; night, 13°; partly cloudy

10 December, wed

	763 mmHg		79%
	9.2 m/s		+16

10 December, Wednesday. day, 15°; night, 13°; overcast

11 December, thu

	762 mmHg		79%
	8.7 m/s		+16

11 December, Thursday. day, 15°; night, 14°; overcast

12 December, fri

	762 mmHg		80%
	8.5 m/s		+16

12 December, Friday. day, 15°; night, 13°; overcast

13 December, sat

	761 mmHg		81%
	9 m/s		+16

13 December, Saturday. day, 15°; night, 13°; rain

14 December, sun

	761 mmHg		79%
	8.89 m/s		+16

14 December, Sunday. day, 15°; night, 13°; rain

15 December, mon

	762 mmHg		74%
	9.2 m/s		+16

15 December, Monday. day, 14°; night, 13°; clear

16 December, tue

	761 mmHg		76%
	9.5 m/s		+16

16 December, Tuesday. day, 14°; night, 12°; rain

17 December, wed

	762 mmHg		75%
	8.8 m/s		+16

17 December, Wednesday. day, 15°; night, 13°; partly cloudy

18 December, thu

	762 mmHg		79%
	9.39 m/s		+16

18 December, Thursday. day, 15°; night, 13°; rain

19 December, fri

	761 mmHg		77%
	10.3 m/s		+16

19 December, Friday. day, 15°; night, 13°; rain

20 December, sat

	762 mmHg		76%
	9.6 m/s		+16

20 December, Saturday. day, 14°; night, 13°; partly cloudy

21 December, sun

	762 mmHg		79%
	8.8 m/s		+16

21 December, Sunday. day, 15°; night, 13°; clear

22 December, mon

	762 mmHg		80%
	8.3 m/s		+16

22 December, Monday. day, 14°; night, 13°; clear

23 December, tue

	763 mmHg		80%
	9 m/s		+16

23 December, Tuesday. day, 14°; night, 13°; rain

24 December, wed

	762 mmHg		78%
	8.8 m/s		+16

24 December, Wednesday. day, 14°; night, 13°; clear

25 December, thu

	762 mmHg		78%
	9.3 m/s		+16

25 December, Thursday. day, 14°; night, 13°; rain

26 December, fri

	763 mmHg		77%
	8.89 m/s		+16

26 December, Friday. day, 14°; night, 13°; clear

27 December, sat

	763 mmHg		78%
	9.1 m/s		+16

27 December, Saturday. day, 14°; night, 13°; partly cloudy

28 December, sun

	763 mmHg		79%
	9.5 m/s		+16

28 December, Sunday. day, 15°; night, 13°; rain

29 December, mon

	763 mmHg		79%
	9.2 m/s		+16

29 December, Monday. day, 15°; night, 13°; rain

30 December, tue

	763 mmHg		77%
	8.89 m/s		+16

30 December, Tuesday. day, 15°; night, 13°; clear

31 December, wed

	763 mmHg		77%
	9.3 m/s		+16

31 December, Wednesday. day, 15°; night, 13°; rain

1 January, thu

	763 mmHg		78%
	9.3 m/s		+16

1 January, Thursday. day, 14°; night, 13°; rain

2 January, fri

	764 mmHg		78%
	8.89 m/s		+16

2 January, Friday. day, 14°; night, 13°; rain

3 January, sat

	764 mmHg		80%
	8.39 m/s		+16

3 January, Saturday. day, 14°; night, 13°; rain

Average data for 10 years

Cascais December

9

sunny days

12

days with precipitation

7

cloudy days

9 sunny days; 12 days with precipitation; 7 cloudy days;

78

%

air humidity

6.8

m/s

WindS

100

mm of precipitation

(16% of annual average)

+16

°C

Water temperature

air humidity 78%; 100 millimeters of precipitation (16% of annual average); Wind southerly 6.8 Meters per second; Water temperature +16°

Weather graphs for December

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

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S

S

S

S

SE

S

S

S

SE

S

SE

S

S

SE

S

S

SE

S

S

SE

SE

SE

SE

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

31

Daytime temperature

Night-time temperature

Cities near you

Lisbon
Porto
Seville
Cadiz
Faro
Setúbal
Felgueiras
Figueira da foz
Aveiro

Cities with similar weather in December

Barcelona
Tunis
Belek
Marmaris
Heraklion
Sousse
Hammamet
Nice
Bodrum

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

December in Cascais is the windiest month of the year. In December, the weather in Cascais is typically warm. Average daily high temperature in December is about 15 degrees above zero. On average, Cascais has 12 rainy, 9 sunny, 7 partly cloudy, and 3 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and November is considered the most uncomfortable time to visit Cascais.

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