Measurements:
°C
°F
CURRENT WEATHER
00:15
Sintra
54°F
NW 2 mph
Feels like: 54°F
Precip: 0%
World Resorts Portugal Sintra Weather

7 Day Weather Forecast

12.18
thu
DAY
58°F
N 13 mph
precip
0%
NIGHT
58°F
N 14 mph
precip
100%
12.19
fri
DAY
56°F
S 20 mph
precip
65%
NIGHT
54°F
S 14 mph
precip
0%
12.20
sat
DAY
58°F
E 11 mph
precip
100%
NIGHT
54°F
E 19 mph
precip
100%
12.21
sun
DAY
52°F
SE 13 mph
precip
77%
NIGHT
54°F
E 18 mph
precip
100%
12.22
mon
DAY
54°F
SE 27 mph
precip
100%
NIGHT
54°F
S 23 mph
precip
100%
12.23
tue
DAY
60°F
S 17 mph
precip
82%
NIGHT
54°F
SE 13 mph
precip
100%
12.24
wed
DAY
56°F
SE 16 mph
precip
100%
NIGHT
48°F
SW 9 mph
precip
100%

Sintra Sea Water Temperature in December, °F

Select Year: 2025 2024 2023

The average sea surface temperature in December 2025 for Sintra was 15.8°F. The maximum and minimum values were 15.6°F and 16.0°F respectively.

Sintra on the Weather Map

Best Time to Visit Sintra
The most sunny months:
August 27 days
July 26 days
September 23 days
The most warm months:
August 81.7 °F
July 80.8 °F
September 79.6 °F
Warmest sea temperature:
September 66.2 °F
October 65.7 °F
August 65.4 °F
The most cold months:
January 59.9 °F
February 60.6 °F
December 62.0 °F
The most rainy months:
March 4 days
November 4 days
January 4 days
The most windy months:
July 12 mph
August 12 mph
June 12 mph
more details