Portugal: where to swim in August?
Portugal, in August: the sea is at 19.5 °C on average along the coast, from 18.1 °C to 21.3 °C depending on the spot. Where the water is warmest (21.3 °C), it is pleasant. You can swim for a long time without shivering.
Sea temperature, month by month
| Month | Average temperature | Depending on the spot | Where it is warmest |
|---|---|---|---|
| January | 15.6 °C | 14.3 °C – 17.1 °C | cool |
| February | 14.9 °C | 13.8 °C – 16.3 °C | cool |
| March | 14.9 °C | 13.8 °C – 16.3 °C | cool |
| April | 16.0 °C | 15.1 °C – 17.2 °C | cool |
| May | 17.2 °C | 16.0 °C – 18.8 °C | cool |
| June | 18.5 °C | 17.4 °C – 20.2 °C | pleasant |
| July | 19.2 °C | 17.9 °C – 21.2 °C | pleasant |
| August | 19.5 °C | 18.1 °C – 21.3 °C | pleasant |
| September | 20.2 °C | 18.4 °C – 22.1 °C | pleasant |
| October | 19.6 °C | 17.5 °C – 21.8 °C | pleasant |
| November | 18.1 °C | 16.5 °C – 19.9 °C | pleasant |
| December | 16.7 °C | 15.0 °C – 18.2 °C | cool |
Compared with July, the water warms up by 0.3 °C in August. The warmest month: September (20.2 °C). The coldest: February (14.9 °C).
Nearby, in August
- France 21.1 °C · warm
- Ireland 15.8 °C · cool
- United Kingdom 15.0 °C · cool
- Netherlands 18.4 °C · pleasant
- Germany 18.6 °C · pleasant
- Croatia 25.9 °C · warm
And right now?
For the temperature measured right now, station by station and to the hour: Portugal: water temperature
Frequently asked questions
What is the sea temperature in August?
Portugal, in August: 19.5 °C on average along the coast, from 18.1 °C in the coolest waters to 21.3 °C in the warmest (average of the years 2011 to 2025).
Can you swim in August?
Where the water is warmest (21.3 °C), it is pleasant. You can swim for a long time without shivering.
What is the best month for swimming?
The water is warmest in September (20.2 °C on average) and coldest in February (14.9 °C). Where the water is warmest, it goes above 20 °C in these months: June, July, August, September, October.
Where is the water warmest in August?
The warmest in August: France (21.1 °C), Ireland (15.8 °C), United Kingdom (15.0 °C). The coolest: Croatia (25.9 °C).
Where do these temperatures come from?
These are averages of the sea surface temperature from 2011 to 2025, computed from NOAA satellite images (OISST, one value about every 50 km), in a 100 km strip along the coasts of the main country: distant territories (overseas, remote islands) are not counted. It is an estimate, not a measurement taken at the beach: lakes and rivers are not included.