17.05
sun
sun
Day
61°F
SE 14 mph
Precip.
75%
75%
Night
55°F
S 15 mph
Precip.
0%
0%
18.05
mon
mon
Day
61°F
SE 10 mph
Precip.
0%
0%
Night
57°F
SE 5 mph
Precip.
0%
0%
19.05
tue
tue
Day
66°F
SE 6 mph
Precip.
0%
0%
Night
61°F
S 10 mph
Precip.
0%
0%
20.05
wed
wed
Day
73°F
W 4 mph
Precip.
0%
0%
Night
68°F
S 3 mph
Precip.
0%
0%
21.05
thu
thu
Day
75°F
N 1 mph
Precip.
0%
0%
Night
70°F
S 8 mph
Precip.
0%
0%
22.05
fri
fri
Day
75°F
NE 4 mph
Precip.
0%
0%
Night
66°F
S 9 mph
Precip.
0%
0%
23.05
sat
sat
Day
70°F
NE 14 mph
Precip.
0%
0%
Night
59°F
S 16 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 61.1°F. The highest and lowest sea temperatures during the month were 62.6°F and 59.7°F.
Sea water temperature in June, °F
Show year:
2025
2024
2023
The average sea water temperature in June of 2025 was 63.0°F. The highest and lowest sea temperatures during the month were 64.9°F and 60.6°F.
Air temperature in Sintra, °F
Precipitation total in Sintra, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Sintra
Sintra on a weather map
Places in Portugal:
Name
°F
24 Hours Forecast
Sintra
Local time: 22:07
May 18, monday
0000
55°F
S
15 mph
15 mph
0300
55°F
S
13 mph
13 mph
0600
54°F
S
11 mph
11 mph
0900
57°F
SE
12 mph
12 mph
1200
61°F
SE
10 mph
10 mph
1500
61°F
SE
11 mph
11 mph
1800
61°F
SE
11 mph
11 mph
2100
57°F
SE
11 mph
11 mph
