Sea temperature and swimming season in Portugal
When the sea is warm enough to swim in 15 coastal cities in Portugal.
| City | Warmest | Coldest | Swimming season |
|---|---|---|---|
| Lisbon | 18.9°C Sep | 15.0°C Mar | never comfortable |
| Porto | 17.3°C Sep | 13.8°C Jan | never comfortable |
| Setúbal | 19.2°C Aug | 15.0°C Feb | Aug – Aug (1 months) |
| Funchal | 24.2°C Sep | 18.8°C Mar | Apr – Feb (11 months) |
| Aveiro | 18.1°C Aug | 14.2°C Feb | never comfortable |
| Faro | 21.2°C Aug | 16.2°C Mar | Jun – Nov (6 months) |
| Figueira da Foz | 18.1°C Aug | 14.3°C Feb | never comfortable |
| Viana do Castelo | 17.4°C Sep | 13.9°C Feb | never comfortable |
| Vila do Conde | 17.5°C Sep | 14.0°C Feb | never comfortable |
| Estoril | 18.8°C Sep | 15.0°C Mar | never comfortable |
| Ponta Delgada | 24.2°C Aug | 16.7°C Feb | Jun – Nov (6 months) |
| Tavira | 22.0°C Aug | 15.7°C Mar | Jun – Oct (5 months) |
| Sines | 18.9°C Sep | 15.1°C Mar | never comfortable |
| Angra do Heroísmo | 24.0°C Aug | 16.3°C Feb | Jun – Nov (6 months) |
| Óbidos | 18.5°C Sep | 14.5°C Mar | never comfortable |
Knowing the temperature is only half of it. What to wear, and why cold shock is the real risk →
Season uses 19°C. Why that number, and where the data comes from