The highest day temperature in September 2023 was 88°F. The lowest night temperature was 68°F. The average values for day and night temperatures during September were 81.7°F и 72.2°F respectivly.

The average sea surface temperature in September 2023 for Istanbul was 75.9°F. The maximum and minimum values were 73.0°F and 79.6°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Istanbul is 1.0 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 12.3 mph. It makes September one of the most windy months of the year for Istanbul.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Istanbul in September is 9.6 hours.