Weather in Istanbul in September
September in Istanbul is warm outdoor weather. Days are long enough to be useful. Shade starts to matter at midday.
In Turkey, this is how Istanbul actually wears September, not how a country centroid would. Compared with August and January, September sits in the middle of Istanbul's year.
Pack for Istanbul in September, not for a brochure that was photographed in another season.
- Average temp
- 21°C
17–26°C
- Rainfall
- 43 mm
Not much rain
- Sunshine
- 7.5 h
hours per day
What to expect
Daytime
Warm days in Istanbul in September. A hat starts to earn its keep at midday. Evenings are the comfortable part of the clock.
You can walk at more hours than in the fierce months. Still build in a pause when the sun is high. Nights are easy.
Rain
Mixed skies in Istanbul in September. Dry days and wet days share the month. Outdoor plans need a backup, not a cancellation policy.
Pack a shell you will actually carry. The monthly table is the place for totals. This is the feel: usable, interrupted.
Evening
Evenings are cooler. A layer helps after sunset.
What to pack
Sun protection
A layer for cooler evenings
Where to stay in Istanbul
Dates are a starting point for September.
Travel guides for Istanbul
What to read before you book.
Average weather in Istanbul
TemperatureRainfall
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FAQs about Istanbul
Climate averages for Istanbul, 1991–2020.
The best time to visit Istanbul is between May and October, the most comfortable stretch of the year on these averages.
August is the hottest month, with an average around 25°C.
December is the wettest month, with about 101 mm of rain.
No. These are 1991–2020 climate normals from Meteostat, not a live forecast. Actual weather in any given week can differ.
