Average sea water temperature in September:
+64.7°F
| Minimum sea water temperature in September: | 69.4°F |
| Maximum sea water temperature in September: | 59.0°F |
Daily sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 65.2°F. The highest and lowest sea temperatures during the month were 66.9°F and 63.7°F.
Monthly sea water temperature in Cascais, °F
Which Portugal resorts have warmest sea in September?
| Place name | September 2026 | September 2025 |
|---|---|---|
| Madeira | 77.4°F | 74.6°F |
| Funchal | 77.4°F | 74.6°F |
| Canico | 77.0°F | 74.3°F |
| Corvo Island | 76.3°F | 72.6°F |
| Sao Jorge | 76.1°F | 73.3°F |
| Santa Maria Island | 76.0°F | 73.7°F |
| Flores Island | 75.9°F | 72.8°F |
| Graciosa | 75.9°F | 72.7°F |
| Pico Island | 75.7°F | 73.1°F |
| Faial Island | 75.6°F | 73.1°F |
| Porto Santo Island | 75.6°F | 74.1°F |
| Terceira Island | 75.5°F | 72.6°F |
| Ponta Delgada | 75.4°F | 73.1°F |
| Sao Miguel | 75.3°F | 72.9°F |
| Tavira | 70.4°F | 66.5°F |
| Faro | 69.8°F | 67.0°F |
| Algarve | 69.8°F | 67.0°F |
| Quarteira | 68.9°F | 66.0°F |
| Lisbon | 68.5°F | 65.9°F |
| Albufeira | 68.3°F | 65.5°F |
Best time for vacation in Cascais
Cascais on a weather map
Places in Portugal:
Name
°F
24 Hours Forecast
Cascais
Local time: 06:19
September 16, wednesday
0900
64°F
S
29 mph
29 mph
1200
66°F
S
29 mph
29 mph
1500
66°F
S
30 mph
30 mph
1800
66°F
S
32 mph
32 mph
2100
66°F
S
32 mph
32 mph
September 17, thursday
0000
66°F
S
29 mph
29 mph
0300
66°F
S
27 mph
27 mph
0600
64°F
S
17 mph
17 mph
