Istanbul Weather in September
In September, Istanbul averages a high of 27°C (80°F) and a low of 15°C (59°F), based on 52 years of historical weather data from ISTANBUL.
27°C
Average high
80°F
15°C
Average low
59°F
41°C
Record high
105°F · 2017
5°C
Record low
41°F · 1992
What to Expect in Istanbul in September
Typical September days in Istanbul reach 27°C (80°F) during the afternoon and cool to around 15°C (59°F) overnight. On average, measurable rain falls on about 23% of days this month. Over the past 52 years, September temperatures in Istanbul have ranged from a record high of 41°C (2017) down to a record low of 5°C (1992).
For a day-by-day look or other months, see the full Istanbul weather history.