19.12
fri
fri
Day
55°F
S 18 mph
Precip.
0%
0%
Night
54°F
SE 10 mph
Precip.
76%
76%
20.12
sat
sat
Day
59°F
E 16 mph
Precip.
100%
100%
Night
52°F
E 14 mph
Precip.
100%
100%
21.12
sun
sun
Day
55°F
E 17 mph
Precip.
100%
100%
Night
54°F
E 19 mph
Precip.
76%
76%
22.12
mon
mon
Day
57°F
E 24 mph
Precip.
100%
100%
Night
57°F
NE 18 mph
Precip.
100%
100%
23.12
tue
tue
Day
59°F
E 17 mph
Precip.
100%
100%
Night
54°F
SE 18 mph
Precip.
100%
100%
24.12
wed
wed
Day
57°F
SE 17 mph
Precip.
64%
64%
Night
54°F
SE 24 mph
Precip.
100%
100%
25.12
thu
thu
Day
57°F
S 19 mph
Precip.
88%
88%
Night
54°F
SE 11 mph
Precip.
0%
0%
26.12
fri
fri
Day
61°F
E 11 mph
Precip.
100%
100%
Night
57°F
NE 16 mph
Precip.
100%
100%
27.12
sat
sat
Day
63°F
SE 9 mph
Precip.
68%
68%
Night
55°F
SE 11 mph
Precip.
0%
0%
28.12
sun
sun
Day
61°F
SE 14 mph
Precip.
64%
64%
Night
55°F
SE 20 mph
Precip.
100%
100%
29.12
mon
mon
Day
59°F
SE 22 mph
Precip.
100%
100%
Night
54°F
S 16 mph
Precip.
69%
69%
30.12
tue
tue
Day
55°F
S 7 mph
Precip.
0%
0%
Night
54°F
SE 9 mph
Precip.
100%
100%
31.12
wed
wed
Day
57°F
S 10 mph
Precip.
0%
0%
Night
52°F
S 13 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 60.5°F. The highest and lowest sea temperatures during the month were 60.8°F and 59.9°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 60.0°F. The highest and lowest sea temperatures during the month were 60.8°F and 59.4°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: 01:55
December 19, friday
0300
55°F
S
15 mph
15 mph
0600
55°F
S
19 mph
19 mph
0900
55°F
S
16 mph
16 mph
1200
55°F
S
18 mph
18 mph
1500
57°F
S
16 mph
16 mph
1800
55°F
S
14 mph
14 mph
2100
54°F
S
14 mph
14 mph
December 20, saturday
0000
54°F
SE
10 mph
10 mph
