Current sea water temperature:
+56.8°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 14 | 56.8°F | December 9 | 59.2°F |
| December 13 | 57.2°F | December 8 | 58.6°F |
| December 12 | 58.1°F | December 7 | 59.2°F |
| December 11 | 58.1°F | December 6 | 59.5°F |
| December 10 | 58.8°F | December 5 | 59.9°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
December
December
| Istanbul |
Best time for vacation in Istanbul
Istanbul on a weather map
Places in Turkey:
Name
°F
24 Hours Forecast
Istanbul
Local time: 05:28
December 15, monday
0600
48°F
S
4 mph
4 mph
0900
50°F
SW
5 mph
5 mph
1200
54°F
SW
9 mph
9 mph
1500
54°F
SW
10 mph
10 mph
1800
50°F
SW
6 mph
6 mph
2100
48°F
SW
5 mph
5 mph
December 16, tuesday
0000
48°F
SW
4 mph
4 mph
0300
46°F
SW
3 mph
3 mph
