28.12
sun
sun
Day
54°F
SW 12 mph
Precip.
0%
0%
Night
50°F
SW 9 mph
Precip.
0%
0%
29.12
mon
mon
Day
55°F
SW 4 mph
Precip.
0%
0%
Night
52°F
S 6 mph
Precip.
0%
0%
30.12
tue
tue
Day
55°F
S 4 mph
Precip.
0%
0%
Night
52°F
S 9 mph
Precip.
0%
0%
31.12
wed
wed
Day
57°F
S 10 mph
Precip.
0%
0%
Night
52°F
S 6 mph
Precip.
89%
89%
01.01
thu
thu
Day
52°F
W 7 mph
Precip.
0%
0%
Night
50°F
W 7 mph
Precip.
0%
0%
02.01
fri
fri
Day
50°F
SW 6 mph
Precip.
0%
0%
Night
48°F
SW 11 mph
Precip.
0%
0%
03.01
sat
sat
Day
50°F
SW 19 mph
Precip.
100%
100%
Night
50°F
SW 25 mph
Precip.
100%
100%
04.01
sun
sun
Day
52°F
SW 16 mph
Precip.
0%
0%
Night
50°F
S 17 mph
Precip.
0%
0%
05.01
mon
mon
Day
55°F
S 19 mph
Precip.
0%
0%
Night
46°F
W 11 mph
Precip.
0%
0%
06.01
tue
tue
Day
48°F
W 11 mph
Precip.
0%
0%
Night
46°F
W 11 mph
Precip.
0%
0%
07.01
wed
wed
Day
50°F
W 17 mph
Precip.
0%
0%
Night
50°F
W 12 mph
Precip.
100%
100%
08.01
thu
thu
Day
52°F
SW 12 mph
Precip.
0%
0%
Night
50°F
S 16 mph
Precip.
0%
0%
09.01
fri
fri
Day
55°F
SE 24 mph
Precip.
100%
100%
Night
50°F
S 20 mph
Precip.
100%
100%
10.01
sat
sat
Day
50°F
S 14 mph
Precip.
100%
100%
Night
46°F
S 7 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 59.9°F. The highest and lowest sea temperatures during the month were 60.6°F and 57.7°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: 18:57
December 28, sunday
2100
52°F
SW
11 mph
11 mph
December 29, monday
0000
50°F
SW
9 mph
9 mph
0300
50°F
SW
8 mph
8 mph
0600
50°F
SW
8 mph
8 mph
0900
52°F
SW
6 mph
6 mph
1200
55°F
SW
4 mph
4 mph
1500
57°F
S
9 mph
9 mph
1800
55°F
S
7 mph
7 mph
