# Lagos water temperature Sea temperature at Lagos is 18.4 °C (65.1 °F). - Location: Lagos, Portugal - Timezone: Europe/Lisbon - Source: Open-Meteo marine forecast (snapshot) - Generated at: 2026-09-22T12:21:49.063926+01:00 - Forecast page: https://snorkelforecast.com/portugal/lagos/ - HTML sea temperature: https://snorkelforecast.com/portugal/lagos/sea-temperature/ - Temperature is not a safety rating or snorkel score. - Guidance: Cool water - What to wear: A 3 mm shorty or full wetsuit will make longer snorkels more comfortable. ## Monthly baseline - January: 16.4 °C (61.5 °F) - February: 16.0 °C (60.8 °F) - March: 15.6 °C (60.1 °F) - April: 16.5 °C (61.7 °F) - May: 16.6 °C (61.9 °F) - June: 17.8 °C (64.0 °F) - July: 17.4 °C (63.3 °F) - August: 17.4 °C (63.3 °F) - September: 17.0 °C (62.6 °F) - October: 18.3 °C (64.9 °F) - November: 17.6 °C (63.7 °F) - December: 16.9 °C (62.4 °F)