19.12
fri
fri
Day
57°F
S 20 mph
Precip.
0%
0%
Night
54°F
SE 12 mph
Precip.
84%
84%
20.12
sat
sat
Day
59°F
E 17 mph
Precip.
100%
100%
Night
55°F
E 17 mph
Precip.
100%
100%
21.12
sun
sun
Day
55°F
E 18 mph
Precip.
100%
100%
Night
55°F
SE 21 mph
Precip.
77%
77%
22.12
mon
mon
Day
59°F
E 25 mph
Precip.
100%
100%
Night
59°F
NE 19 mph
Precip.
100%
100%
23.12
tue
tue
Day
59°F
E 17 mph
Precip.
100%
100%
Night
55°F
SE 21 mph
Precip.
100%
100%
24.12
wed
wed
Day
59°F
SE 19 mph
Precip.
82%
82%
Night
55°F
SE 25 mph
Precip.
100%
100%
25.12
thu
thu
Day
59°F
S 20 mph
Precip.
0%
0%
Night
55°F
SE 12 mph
Precip.
0%
0%
26.12
fri
fri
Day
59°F
E 11 mph
Precip.
100%
100%
Night
59°F
NE 18 mph
Precip.
100%
100%
27.12
sat
sat
Day
61°F
SE 9 mph
Precip.
86%
86%
Night
57°F
SE 11 mph
Precip.
0%
0%
28.12
sun
sun
Day
59°F
S 16 mph
Precip.
0%
0%
Night
57°F
SE 22 mph
Precip.
100%
100%
29.12
mon
mon
Day
57°F
SE 24 mph
Precip.
100%
100%
Night
55°F
S 19 mph
Precip.
74%
74%
30.12
tue
tue
Day
55°F
S 8 mph
Precip.
0%
0%
Night
55°F
SE 11 mph
Precip.
100%
100%
31.12
wed
wed
Day
57°F
S 11 mph
Precip.
0%
0%
Night
54°F
S 16 mph
Precip.
0%
0%
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 60.4°F. The highest and lowest sea temperatures during the month were 60.6°F and 59.9°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 60.1°F. The highest and lowest sea temperatures during the month were 61.0°F and 59.5°F.
Air temperature in Cascais, °F
Precipitation total in Cascais, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Cascais
Cascais on a weather map
Places in Portugal:
Name
°F
24 Hours Forecast
Cascais
Local time: 01:57
December 19, friday
0300
57°F
S
17 mph
17 mph
0600
57°F
S
21 mph
21 mph
0900
57°F
S
18 mph
18 mph
1200
57°F
S
20 mph
20 mph
1500
57°F
S
17 mph
17 mph
1800
55°F
S
16 mph
16 mph
2100
55°F
S
16 mph
16 mph
December 20, saturday
0000
54°F
SE
12 mph
12 mph
