Current Sea Water Temperature:
+61.6°F
| Maximum Sea Water Temperature in December: | 65.6°F |
| Minimum Sea Water Temperature in December: | 57.2°F |
| Average water temperature in December: | 61.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 14 | 61.6°F | December 09 | 61.8°F |
| December 13 | 61.8°F | December 08 | 61.6°F |
| December 12 | 61.6°F | December 07 | 61.8°F |
| December 11 | 61.6°F | December 06 | 61.6°F |
| December 10 | 61.4°F | December 05 | 61.6°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 2025 for Cascais was 66.9°F. The maximum and minimum values were 64.8°F and 69.4°F respectively.
Portugal Resorts:
NAME
F°
| Albufeira |  |
+54 |
| Algarve | |
+56 |
| Cascais |  |
+54 |
| Faro | |
+56 |
| Funchal |  |
+60 |
| Lagos | |
+54 |
| Lisbon | |
+50 |
| Madeira | |
+60 |
| Ponta Delgada |  |
+66 |
| Portimao | |
+52 |
| Porto | |
+50 |
| Porto Santo Island |  |
+68 |
| Quarteira | |
+54 |
| Sao Miguel | |
+66 |
| Terceira Island | |
+64 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Cascais
Local time: 10:08
14 dec, sunday
| 1200 |  |
58°F | SW 14 mph |
| 1500 | |
62°F | SW 12 mph |
| 1800 |  |
58°F | SW 9 mph |
| 2100 | |
56°F | SW 6 mph |
15 dec, monday
| 0000 | |
56°F | W 7 mph |
| 0300 | |
54°F | W 4 mph |
| 0600 |  |
54°F | N 5 mph |
| 0900 |  |
58°F | NE 7 mph |