27.08
thu
thu
Day
68°F
E 17 mph
Precip.
20%
20%
Night
66°F
SE 5 mph
Precip.
6%
6%
28.08
fri
fri
Day
68°F
SE 6 mph
Precip.
8%
8%
Night
66°F
S 20 mph
Precip.
17%
17%
29.08
sat
sat
Day
68°F
S 16 mph
Precip.
8%
8%
Night
68°F
S 17 mph
Precip.
14%
14%
30.08
sun
sun
Day
70°F
S 11 mph
Precip.
11%
11%
Night
66°F
S 22 mph
Precip.
12%
12%
31.08
mon
mon
Day
68°F
S 24 mph
Precip.
10%
10%
Night
66°F
S 26 mph
Precip.
10%
10%
01.09
tue
tue
Day
68°F
S 26 mph
Precip.
8%
8%
Night
66°F
NW 25 mph
Precip.
12%
12%
02.09
wed
wed
Day
68°F
NE 19 mph
Precip.
11%
11%
Night
66°F
S 19 mph
Precip.
14%
14%
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 65.5°F. The highest and lowest sea temperatures during the month were 66.9°F and 63.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 62.6°F. The highest and lowest sea temperatures during the month were 65.5°F and 60.3°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: 02:18
August 27, thursday
0300
66°F
NE
16 mph
16 mph
0600
66°F
NE
24 mph
24 mph
0900
66°F
E
20 mph
20 mph
1200
68°F
E
17 mph
17 mph
1500
68°F
E
15 mph
15 mph
1800
68°F
E
14 mph
14 mph
2100
68°F
SE
9 mph
9 mph
August 28, friday
0000
66°F
SE
5 mph
5 mph
