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Climate · Istanbul

Istanbul in September

Warm and mostly dry, as the days shorten.

Typical weather, averaged over 30 years

September in Istanbul is warm: highs near 79°F, lows near 65°F. Rain falls on about two days a week, more often as the month goes on, and the days shorten by 59 minutes from the first week to the last.September in Istanbul is warm: highs near 26°C, lows near 18°C. Rain falls on about two days a week, more often as the month goes on, and the days shorten by 59 minutes from the first week to the last.

High
79°F26°Caverage
Low
65°F18°Caverage
Wet days
2a week · 23% of days
Daylight
12h 23mon average

Is September a good time to visit Istanbul?

Yes. September is one of Istanbul's best months (May to June, or September to October).

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 79°F in September, against 51°F to 86°F through the year.Highs near 26°C in September, against 11°C to 30°C through the year.

Chance of a wet day

23% of days in September, against 14% to 46% through the year.

Cloud cover

28% cover in September, against 10% to 62% through the year.

Daylight

12h 23m in September, against 9h 16m to 15h 04m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August86°30°low 71°low 22°1 wet day a weekRain on about one day a week.
  2. September79°26°low 65°low 18°2 wet days a weekRain on about two days a week.
  3. October71°22°low 59°low 15°2 wet days a weekRain on about two days a week.

Where Istanbul sits, in September

Europe/Istanbul
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
6:43 AMsets 7:16 PM
Above the sea
40 mlow-lying
Latitude
41.0°Nnorthern hemisphere
Nearest of ours
Ankara350 km east

The land around Istanbul, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Turkey in September

high · low · wet days
See September on the planning mapThe whole year in Istanbul

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Istanbul. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.