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7 October 2026 · Wednesday Every adventure begins somewhere
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MARMARA · ISTANBUL

Sedef Island (Adalar)

20.0°C ↑ 0.1 · from yesterday
Cold Measured 42 min ago

Over the last 7 days the temperature ranged 19.9°C–21.0°C. The bay's own character and daily wind direction drive the day-to-day swings.

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Map: OpenFreeMap © OpenMapTiles · Data: OpenStreetMap contributors (ODbL)
Record source: Open-Meteo Marine API

Records shown on the map

Sea water temperature (83)

7-day trend

°C · daily average
21.0°C
Wed
20.7°C
Thu
20.5°C
Fri
20.3°C
Sat
20.1°C
Sun
20.1°C
Mon
19.9°C
Today
Week's high 21.0°C Low 19.9°C Weekly change −1.1°
Air temperature 16°C
Wave 0.2 m
Wind 5 kt ENE
Humidity 82%

Nearby points

Büyükada (Adalar) 20.0°C Burgazada (Adalar) 20.0°C Beylikdüzü Gürpınar 19.9°C

Swimming season at Sedef Island (Adalar)

The smallest and quietest inhabited island of the Princes' Islands (roughly 1,300 by 1,100 meters). Its name comes from the way its vegetation resembles mother-of-pearl ("sedef") from a distance. It has two beaches and is known for the cleanliness of its sea; since three-quarters of the island is privately owned, the area accessible to the public is limited.

When to go June-September.
Who it suits For those who want to get completely away from Istanbul's hustle and bustle — its small size and limited access naturally keep crowds down.
Source: Open-Meteo Marine API · Updates hourly Advenway Tools