Current sea water temperature:
+60.4°F
| Minimum sea water temperature in December: | 64.0°F |
| Maximum sea water temperature in December: | 56.5°F |
| Average sea water temperature in December: | 60.3°F |
| more information | |
14 days
forecast
forecast
| Cascais |
monthly
weather
weather
| Cascais |
Sea water temperature for the last 10 days:
| December 14 | 60.4°F | December 9 | 60.6°F |
| December 13 | 60.6°F | December 8 | 60.4°F |
| December 12 | 60.4°F | December 7 | 60.6°F |
| December 11 | 60.4°F | December 6 | 60.4°F |
| December 10 | 60.3°F | December 5 | 60.4°F |
Monthly sea water temperature, °F
When is the warmest sea in Cascais?
Based on the data about daily sea water temperature for the last three years the warmest sea in Cascais was noticed in September, October and August.
Monthly Sea Temperatures in Cascais, °F
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 62.6°F. The highest and lowest sea temperatures during the month were 65.5°F and 60.3°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 63.2°F. The highest and lowest sea temperatures during the month were 65.8°F and 61.5°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 65.2°F. The highest and lowest sea temperatures during the month were 67.5°F and 63.3°F.
current
weather
weather
| Cascais |
weather in
December
December
| Cascais |
Best time for vacation in Cascais
Cascais on a weather map
Places in Portugal:
Name
°F
24 Hours Forecast
Cascais
Local time: 06:45
December 15, monday
0900
57°F
NE
6 mph
6 mph
1200
59°F
NE
9 mph
9 mph
1500
57°F
NE
21 mph
21 mph
1800
57°F
SE
21 mph
21 mph
2100
54°F
SE
22 mph
22 mph
December 16, tuesday
0000
54°F
SE
25 mph
25 mph
0300
54°F
SE
30 mph
30 mph
0600
55°F
SE
37 mph
37 mph
