# Kos water temperature Sea temperature at Kos is 26.8 °C (80.2 °F). - Location: Kos, Greece - Timezone: Europe/Athens - Source: Open-Meteo marine forecast (snapshot) - Generated at: 2026-09-23T08:26:13.688035+03:00 - Forecast page: https://snorkelforecast.com/greece/kos/ - HTML sea temperature: https://snorkelforecast.com/greece/kos/sea-temperature/ - Temperature is not a safety rating or snorkel score. - Guidance: Warm water - What to wear: Most people are comfortable in swimwear or a light rash guard. ## Monthly baseline - January: 19.4 °C (66.9 °F) - February: 18.1 °C (64.6 °F) - March: 17.6 °C (63.7 °F) - April: 18.1 °C (64.6 °F) - May: 19.7 °C (67.5 °F) - June: 22.9 °C (73.2 °F) - July: 25.6 °C (78.1 °F) - August: 27.0 °C (80.6 °F) - September: 26.4 °C (79.5 °F) - October: 24.5 °C (76.1 °F) - November: 22.5 °C (72.5 °F) - December: 20.7 °C (69.3 °F)