16.09
wed
wed
Day
66°F
S 29 mph
Precip.
9%
9%
Night
66°F
S 29 mph
Precip.
26%
26%
17.09
thu
thu
Day
68°F
S 23 mph
Precip.
6%
6%
Night
66°F
S 27 mph
Precip.
11%
11%
18.09
fri
fri
Day
68°F
S 16 mph
Precip.
8%
8%
Night
66°F
S 17 mph
Precip.
10%
10%
19.09
sat
sat
Day
72°F
NE 4 mph
Precip.
2%
2%
Night
68°F
S 13 mph
Precip.
8%
8%
20.09
sun
sun
Day
73°F
NW 5 mph
Precip.
4%
4%
Night
72°F
SW 11 mph
Precip.
4%
4%
21.09
mon
mon
Day
75°F
NE 4 mph
Precip.
2%
2%
Night
70°F
NW 13 mph
Precip.
4%
4%
22.09
tue
tue
Day
73°F
N 6 mph
Precip.
4%
4%
Night
68°F
NE 11 mph
Precip.
7%
7%
23.09
wed
wed
Day
70°F
NE 4 mph
Precip.
4%
4%
Night
68°F
S 11 mph
Precip.
13%
13%
24.09
thu
thu
Day
70°F
N 6 mph
Precip.
6%
6%
Night
68°F
S 7 mph
Precip.
10%
10%
25.09
fri
fri
Day
73°F
N 6 mph
Precip.
3%
3%
Night
68°F
NE 8 mph
Precip.
7%
7%
26.09
sat
sat
Day
70°F
N 6 mph
Precip.
6%
6%
Night
68°F
S 7 mph
Precip.
10%
10%
27.09
sun
sun
Day
70°F
N 3 mph
Precip.
6%
6%
Night
68°F
NE 9 mph
Precip.
24%
24%
28.09
mon
mon
Day
70°F
SE 6 mph
Precip.
14%
14%
Night
68°F
SE 9 mph
Precip.
28%
28%
29.09
tue
tue
Day
68°F
S 16 mph
Precip.
25%
25%
Night
64°F
S 27 mph
Precip.
20%
20%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 65.2°F. The highest and lowest sea temperatures during the month were 66.9°F and 63.7°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: 05:41
September 16, wednesday
0600
66°F
S
31 mph
31 mph
0900
64°F
S
29 mph
29 mph
1200
66°F
S
29 mph
29 mph
1500
66°F
S
30 mph
30 mph
1800
66°F
S
32 mph
32 mph
2100
66°F
S
32 mph
32 mph
September 17, thursday
0000
66°F
S
29 mph
29 mph
0300
66°F
S
27 mph
27 mph
