Lisbon water temperature
The sea off Lisbon is warmest in September, around 66°F (19°C), and coolest in February, around 58°F (15°C).
Photo: Lacobrigo, CC BY-SA 4.0
Sea temperature by month
| Month | Sea | Feels | Air high |
|---|---|---|---|
| January | 59°F (15°C) | Cold: wetsuit | 59°F |
| February | 58°F (15°C) | Cold: wetsuit | 62°F |
| March | 58°F (15°C) | Cold: wetsuit | 66°F |
| April | 60°F (15°C) | Cold: wetsuit | 69°F |
| May | 62°F (16°C) | Cold: wetsuit | 74°F |
| June | 64°F (18°C) | Cold: wetsuit | 79°F |
| July | 65°F (18°C) | Cool: wetsuit for long swims | 83°F |
| August | 66°F (19°C) | Cool: wetsuit for long swims | 84°F |
| September | 66°F (19°C) | Cool: wetsuit for long swims | 80°F |
| October | 65°F (18°C) | Cool: wetsuit for long swims | 73°F |
| November | 63°F (17°C) | Cold: wetsuit | 65°F |
| December | 61°F (16°C) | Cold: wetsuit | 60°F |
Average sea-surface temperature just offshore, 1991–2020. Water in shallow bays runs a little warmer on sunny afternoons.
On the water in Lisbon
Questions
When is the water warmest in Lisbon?
September, at about 66°F (19°C).
Can you swim in Lisbon all year?
The sea never reaches 73°F (23°C) on average, so most swimmers use a wetsuit for anything longer than a dip.
Do I need a wetsuit to snorkel in Lisbon?
In February, at 58°F, a 3 mm wetsuit makes a long snorkel much more comfortable. Many tours include or rent one.
