21.12
sun
sun
Day

52°F
SE 19 mph
Precip.
100%
100%
Night

48°F
SE 12 mph
Precip.
100%
100%
22.12
mon
mon
Day

55°F
SE 18 mph
Precip.
100%
100%
Night

55°F
SE 18 mph
Precip.
0%
0%
23.12
tue
tue
Day

54°F
SE 14 mph
Precip.
100%
100%
Night

46°F
S 18 mph
Precip.
0%
0%
24.12
wed
wed
Day

54°F
SW 12 mph
Precip.
0%
0%
Night

50°F
SW 4 mph
Precip.
0%
0%
25.12
thu
thu
Day

52°F
W 4 mph
Precip.
0%
0%
Night

48°F
S 6 mph
Precip.
0%
0%
26.12
fri
fri
Day

52°F
S 16 mph
Precip.
0%
0%
Night

45°F
W 11 mph
Precip.
100%
100%
27.12
sat
sat
Day

52°F
W 20 mph
Precip.
0%
0%
Night

48°F
W 17 mph
Precip.
0%
0%
28.12
sun
sun
Day

55°F
W 15 mph
Precip.
0%
0%
Night

50°F
SW 7 mph
Precip.
0%
0%
29.12
mon
mon
Day

54°F
W 6 mph
Precip.
0%
0%
Night

48°F
W 4 mph
Precip.
0%
0%
30.12
tue
tue
Day

52°F
W 12 mph
Precip.
0%
0%
Night

46°F
W 7 mph
Precip.
0%
0%
31.12
wed
wed
Day

50°F
SW 4 mph
Precip.
0%
0%
Night

48°F
S 9 mph
Precip.
0%
0%
01.01
thu
thu
Day

48°F
SW 17 mph
Precip.
0%
0%
Night

45°F
SW 16 mph
Precip.
0%
0%
02.01
fri
fri
Day

54°F
W 19 mph
Precip.
0%
0%
Night

48°F
W 14 mph
Precip.
0%
0%
03.01
sat
sat
Day

52°F
W 14 mph
Precip.
0%
0%
Night

50°F
W 9 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 60.4°F. The highest and lowest sea temperatures during the month were 60.8°F and 59.5°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: 11:18
December 21, sunday
1200

52°F
SE
19 mph
19 mph
1500

52°F
SE
19 mph
19 mph
1800

50°F
SE
17 mph
17 mph
2100

50°F
SE
15 mph
15 mph
December 22, monday
0000

48°F
SE
12 mph
12 mph
0300

48°F
SE
13 mph
13 mph
0600

48°F
SE
16 mph
16 mph
0900

50°F
S
17 mph
17 mph


























