Weather in Istanbul in September
September in Istanbul is mild with average temperatures around 22.2°C (72.0°F). Moderate rainfall of 54mm spread over 7 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
25.4°C
77.7°F
Low
19.0°C
66.2°F
Precipitation
54 mm
2.1 inches
~7 rainy days
Conditions
Humidity
68%
Comparison to Adjacent Months
September is 3.5°C cooler than August, 32mm wetter than August.
September is 4.9°C warmer than October.