Portugal: where to swim in April?
Portugal, in April: the sea is at 16.0 °C on average along the coast, from 15.1 °C to 17.2 °C depending on the spot. Where the water is warmest (17.2 °C), it is cool. Swimming is fine if you like cool water: you get used to it after a few minutes, especially in mild weather.
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 March, the water warms up by 1.1 °C in April. The warmest month: September (20.2 °C). The coldest: February (14.9 °C).
Nearby, in April
- France 13.0 °C · cool
- Ireland 10.0 °C · cold
- United Kingdom 8.5 °C · very cold
- Netherlands 8.0 °C · very cold
- Germany 6.7 °C · very cold
- Croatia 14.7 °C · cool
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 April?
Portugal, in April: 16.0 °C on average along the coast, from 15.1 °C in the coolest waters to 17.2 °C in the warmest (average of the years 2011 to 2025).
Can you swim in April?
Where the water is warmest (17.2 °C), it is cool. Swimming is fine if you like cool water: you get used to it after a few minutes, especially in mild weather.
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 April?
The warmest in April: France (13.0 °C), Ireland (10.0 °C), United Kingdom (8.5 °C). The coolest: Croatia (14.7 °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.