Current Sea Water Temperature:
+52.4°F
| Maximum Sea Water Temperature in April: | 60.4°F |
| Minimum Sea Water Temperature in April: | 45.2°F |
| Average water temperature in April: | 51.7°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| April 21 | 52.4°F | April 16 | 51.6°F |
| April 20 | 51.4°F | April 15 | 51.2°F |
| April 19 | 50.8°F | April 14 | 50.6°F |
| April 18 | 50.8°F | April 13 | 50.4°F |
| April 17 | 51.0°F | April 12 | 50.0°F |
When is the Warmest Sea for Istanbul?
According to our data for the last three years for Istanbul the highest average sea water temperature was in August, July and September.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Istanbul was 76.5°F. The maximum and minimum values were 72.6°F and 79.2°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Istanbul was 75.4°F. The maximum and minimum values were 71.4°F and 78.8°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Istanbul was 76.3°F. The maximum and minimum values were 73.8°F and 79.2°F respectively.
Turkey Resorts:
NAME
F°
| Alanya |  |
+66 |
| Antalya | |
+70 |
| Beldibi | |
+70 |
| Belek | |
+68 |
| Bodrum | |
+68 |
| Fethiye | |
+72 |
| Istanbul |  |
+64 |
| Kas | |
+68 |
| Kemer | |
+70 |
| Kusadasi | |
+72 |
| Marmaris | |
+70 |
| Mersin |  |
+68 |
| Okurcalar | |
+66 |
| Oludeniz | |
+70 |
| Side | |
+68 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Istanbul
Local time: 14:04
21 apr, tuesday
| 1500 |  |
64°F | N 2 mph |
| 1800 | |
64°F | SW 9 mph |
| 2100 |  |
56°F | SW 9 mph |
22 apr, wednesday
| 0000 |  |
54°F | SW 14 mph |
| 0300 | |
50°F | SW 15 mph |
| 0600 | |
50°F | SW 13 mph |
| 0900 |  |
52°F | W 11 mph |
| 1200 | |
54°F | W 12 mph |