Istanbul weather in September
Istanbul in September averages 21°C (70°F), 43 mm of rain and 7.5 hours of sun a day.
Of the twelve months in Istanbul, September is the fourth warmest, the fifth driest and the fifth sunniest.
- Average temp
- 21°C (70°F)
17–26°C · 62–78°F
- Rainfall
- 43 mm
Not much rain
- Sunshine
- 7.5 h
hours per day
What is Istanbul like in September?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Rain is usually light.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Istanbul in September?
A layer for the evening
Evenings cool off noticeably once the sun is down.
Comfortable walking shoes you can rinse
Dry warm weather is walking weather, and dust gets into everything.
September compared with August and October
September in Istanbul is 4.1°C cooler than August and 15 mm wetter than it, which averages 25°C (78°F).
September in Istanbul is 4.4°C warmer than October and 42 mm drier than it, which averages 17°C (62°F).
Daylight in Istanbul in September
On 15 September the sun is up for 12 hours 28 minutes in Istanbul, rising about 06:44 and setting about 19:12 local time.
September ends 1 hour 18 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 2 hours 39 minutes short of June, the longest-lit month here.
Where to stay in Istanbul
Dates are a starting point for September.
Travel guides for Istanbul
What to read before you book.
Istanbul weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 7°C / 44°F | 74 mm |
| February | 7°C / 44°F | 74 mm |
| March | 9°C / 47°F | 66 mm |
| April | 13°C / 55°F | 47 mm |
| May | 18°C / 64°F | 29 mm |
| June | 22°C / 72°F | 29 mm |
| July | 25°C / 77°F | 23 mm |
| August | 25°C / 78°F | 29 mm |
| September | 21°C / 70°F | 43 mm |
| October | 17°C / 62°F | 85 mm |
| November | 12°C / 54°F | 79 mm |
| December | 8°C / 47°F | 101 mm |
Check another month
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FAQs about Istanbul in September
September climate averages for Istanbul, 1991–2020.
Istanbul averages 21°C (70°F) in September, ranging from about 17°C (62°F) at night to 26°C (78°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Barely. September sees only about 43 mm, so rain is unlikely to affect your plans.
Yes. September averages 21°C (70°F) against 17°C (62°F) in October — 4.4°C warmer.
September is 4.1°C cooler than August, and 15 mm wetter.
Yes. September falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 7.5 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 28 minutes of daylight in mid-September, against 15 hours 7 minutes in June and 9 hours 15 minutes in December.
On 15 September, sunrise is about 06:44 and sunset about 19:12 local time. Both shift across the month — the month ends 1 hour 18 minutes shorter than it starts.
