Current sea water temperature:
+55.2°F
| Minimum sea water temperature in December: | 61.2°F |
| Maximum sea water temperature in December: | 48.4°F |
| Average sea water temperature in December: | 53.7°F |
| more information | |
14 days
forecast
forecast
| Istanbul |
monthly
weather
weather
| Istanbul |
Sea water temperature for the last 10 days:
| December 28 | 55.2°F | December 23 | 55.0°F |
| December 27 | 53.6°F | December 22 | 55.4°F |
| December 26 | 53.8°F | December 21 | 55.9°F |
| December 25 | 54.1°F | December 20 | 56.5°F |
| December 24 | 54.7°F | December 19 | 55.9°F |
Monthly sea water temperature, °F
When is the warmest sea in Istanbul?
Based on the data about daily sea water temperature for the last three years the warmest sea in Istanbul was noticed in August, July and September.
Monthly Sea Temperatures in Istanbul, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 73.9°F. The highest and lowest sea temperatures during the month were 76.3°F and 70.3°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 72.9°F. The highest and lowest sea temperatures during the month were 75.9°F and 69.3°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 73.7°F. The highest and lowest sea temperatures during the month were 76.3°F and 71.4°F.
current
weather
weather
| Istanbul |
weather in
January
January
| Istanbul |
Best time for vacation in Istanbul
Istanbul on a weather map
Places in Turkey:
Name
°F
24 Hours Forecast
Istanbul
Local time: 18:52
December 28, sunday
2100
41°F
SE
6 mph
6 mph
December 29, monday
0000
39°F
SE
11 mph
11 mph
0300
39°F
SE
13 mph
13 mph
0600
37°F
SE
8 mph
8 mph
0900
39°F
E
7 mph
7 mph
1200
43°F
SE
9 mph
9 mph
1500
45°F
E
10 mph
10 mph
1800
43°F
E
8 mph
8 mph
