Current sea water temperature:
+59.4°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 21 | 59.4°F | December 16 | 60.4°F |
| December 20 | 59.7°F | December 15 | 60.4°F |
| December 19 | 59.9°F | December 14 | 60.4°F |
| December 18 | 59.9°F | December 13 | 60.6°F |
| December 17 | 60.3°F | December 12 | 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: 17:57
December 21, sunday
1800
52°F
SE
19 mph
19 mph
2100
52°F
SE
17 mph
17 mph
December 22, monday
0000
52°F
SE
15 mph
15 mph
0300
52°F
SE
15 mph
15 mph
0600
50°F
S
16 mph
16 mph
0900
52°F
S
15 mph
15 mph
1200
55°F
S
16 mph
16 mph
1500
57°F
SE
18 mph
18 mph
