Istanbul weather in September 2025

Expect 24°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Istanbul in September. Check more long-term weather averages for Istanbul in September before you book your next holiday to Turkey in 2025/2026.

  • 24°C maximum daytime temperature in September in Istanbul24
    24°C max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Istanbul7
    7 days with some rainfall
  • 16°C minimum night-time temperature in September in Istanbul16
    16°C min night temperature
  • 12 hours of daylight per day in September in Istanbul12
    12 hours of daylight per day
  • No heat & humidity in September in Istanbul0
    No heat & humidity
  • 43 mm monthly rainfall in September in Istanbul43
    43 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Istanbul6
    6 (High) UV index
  • 22°C sea temperature in September in Istanbul22
    22°C sea temperature

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The September weather guide for Turkey (Istanbul) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Turkey

How hot is it in Istanbul in September?

Daytime temperatures usually reach 24°C in Istanbul in September, falling to 16°C at night.

How sunny is it in Istanbul in September?

There are normally 9 hours of bright sunshine each day in Istanbul in September - that's 71% of daylight hours.

How warm is the sea around Istanbul in September?

The average sea temperature around Istanbul in September is 22°C.

Does it rain in Istanbul in September?

There are usually 7 days with some rain in Istanbul in September and the average monthly rainfall is 43mm.

Istanbul September sunrise & sunset times

Browse the sunrise and sunset times for Istanbul in September 2025. Select a month to view Istanbul sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:31 19:37
Monday, 15th September 2025 06:45 19:13
Tuesday, 30th September 2025 07:00 18:48

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