17.05
sun
sun
Day
61°F
SE 16 mph
Precip.
87%
87%
Night
59°F
S 17 mph
Precip.
0%
0%
18.05
mon
mon
Day
61°F
SE 13 mph
Precip.
0%
0%
Night
59°F
SE 9 mph
Precip.
0%
0%
19.05
tue
tue
Day
66°F
SE 9 mph
Precip.
0%
0%
Night
63°F
S 12 mph
Precip.
0%
0%
20.05
wed
wed
Day
72°F
W 3 mph
Precip.
0%
0%
Night
64°F
S 5 mph
Precip.
0%
0%
21.05
thu
thu
Day
73°F
W 4 mph
Precip.
0%
0%
Night
68°F
NW 8 mph
Precip.
0%
0%
22.05
fri
fri
Day
75°F
NE 6 mph
Precip.
0%
0%
Night
70°F
N 9 mph
Precip.
0%
0%
23.05
sat
sat
Day
72°F
NE 10 mph
Precip.
0%
0%
Night
68°F
NW 6 mph
Precip.
0%
0%
24.05
sun
sun
Day
73°F
NE 9 mph
Precip.
0%
0%
Night
68°F
NW 9 mph
Precip.
0%
0%
25.05
mon
mon
Day
72°F
NE 3 mph
Precip.
0%
0%
Night
70°F
SW 4 mph
Precip.
0%
0%
26.05
tue
tue
Day
72°F
SE 6 mph
Precip.
0%
0%
Night
66°F
S 9 mph
Precip.
0%
0%
27.05
wed
wed
Day
70°F
SE 11 mph
Precip.
0%
0%
Night
63°F
S 12 mph
Precip.
0%
0%
28.05
thu
thu
Day
66°F
SE 14 mph
Precip.
0%
0%
Night
63°F
S 15 mph
Precip.
0%
0%
29.05
fri
fri
Day
66°F
S 13 mph
Precip.
0%
0%
Night
64°F
S 16 mph
Precip.
0%
0%
30.05
sat
sat
Day
68°F
S 15 mph
Precip.
0%
0%
Night
63°F
S 22 mph
Precip.
0%
0%
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 61.2°F. The highest and lowest sea temperatures during the month were 62.8°F and 59.7°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: 03:37
May 17, sunday
0600
59°F
S
16 mph
16 mph
0900
61°F
SE
15 mph
15 mph
1200
61°F
SE
16 mph
16 mph
1500
61°F
SE
17 mph
17 mph
1800
61°F
S
19 mph
19 mph
2100
59°F
S
19 mph
19 mph
May 18, monday
0000
59°F
S
17 mph
17 mph
0300
57°F
S
14 mph
14 mph
