Current Sea Water Temperature:
+68.2°F
| Maximum Sea Water Temperature in August: | 70.2°F |
| Minimum Sea Water Temperature in August: | 59.6°F |
| Average water temperature in August: | 65.6°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| August 19 | 68.2°F | August 14 | 67.0°F |
| August 18 | 67.6°F | August 13 | 67.8°F |
| August 17 | 67.8°F | August 12 | 67.6°F |
| August 16 | 66.2°F | August 11 | 67.6°F |
| August 15 | 66.6°F | August 10 | 67.4°F |
When is the Warmest Sea for Cascais?
According to our data for the last three years for Cascais the highest average sea water temperature was in September, October and August.
Average Water Temperature by Month, °F
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Cascais was 64.0°F. The maximum and minimum values were 61.4°F and 67.2°F respectively.
Sea Water Temperature in October
The average sea surface temperature in October 2025 for Cascais was 64.7°F. The maximum and minimum values were 62.8°F and 67.6°F respectively.
Sea Water Temperature in August
The average sea surface temperature in August 2026 for Cascais was 66.9°F. The maximum and minimum values were 65.2°F and 68.2°F respectively.
Portugal Resorts:
NAME
F°
| Albufeira |  |
+74 |
| Algarve |  |
+76 |
| Cascais | |
+74 |
| Ericeira | |
+82 |
| Faro | |
+76 |
| Funchal |  |
+80 |
| Lagos | |
+74 |
| Lisbon | |
+84 |
| Madeira | |
+80 |
| Ponta Delgada | |
+80 |
| Portimao | |
+82 |
| Porto | |
+84 |
| Quarteira | |
+74 |
| Sao Miguel | |
+80 |
| Setubal | |
+84 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Cascais
Local time: 15:13
19 aug, wednesday
| 1800 |  |
74°F | SE 8 mph |
| 2100 |  |
72°F | S 6 mph |
20 aug, thursday
| 0000 | |
70°F | S 7 mph |
| 0300 | |
70°F | SE 3 mph |
| 0600 | |
70°F | SE 4 mph |
| 0900 | |
70°F | S 3 mph |
| 1200 |  |
72°F | SE 7 mph |
| 1500 |  |
72°F | SE 13 mph |