Measurements:
°C
°F
CURRENT WEATHER
02:44
Istanbul
70°F
SW 11 mph
Feels like: 70°F
Precip: 5%
World Resorts Turkey Istanbul Weather

7 Day Weather Forecast

09.09
wed
DAY
80°F
SW 14 mph
precip
2%
NIGHT
74°F
SW 11 mph
precip
5%
09.10
thu
DAY
82°F
SW 11 mph
precip
2%
NIGHT
74°F
SW 9 mph
precip
5%
09.11
fri
DAY
82°F
SW 9 mph
precip
1%
NIGHT
74°F
SW 10 mph
precip
6%
09.12
sat
DAY
84°F
SW 12 mph
precip
2%
NIGHT
74°F
SW 9 mph
precip
8%
09.13
sun
DAY
80°F
S 4 mph
precip
2%
NIGHT
74°F
SW 11 mph
precip
7%
09.14
mon
DAY
78°F
S 14 mph
precip
23%
NIGHT
72°F
S 8 mph
precip
17%
09.15
tue
DAY
78°F
S 10 mph
precip
15%
NIGHT
72°F
SW 10 mph
precip
26%

Istanbul Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Istanbul was 23.1°F. The maximum and minimum values were 21.9°F and 24.6°F respectively.

Istanbul on the Weather Map

Best Time to Visit Istanbul
The most sunny months:
July 28 days
August 28 days
June 23 days
The most warm months:
July 88.7 °F
August 88.4 °F
June 83.1 °F
Warmest sea temperature:
August 78.6 °F
July 77.1 °F
September 76.0 °F
The most cold months:
January 48.5 °F
February 49.8 °F
December 53.2 °F
The most rainy months:
January 5 days
December 4 days
February 3 days
The most windy months:
August 13 mph
September 12 mph
July 12 mph
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