Early autumn · Weather & things to do
Istanbul in September
Istanbul cools off: highs slip to 77°F (25°C), from 84°F in August, with lows of 66°F (19°C) and about 2.1 in (54 mm) of rain.
At 93/100 for comfort (2nd of 12), it's one of the best months to visit.
- Avg high
- 77°F (25°C)
- Avg low
- 66°F (19°C)
- Rain
- 2.1 in (54 mm)
- Humidity
- 68%
- Cloud cover
- 46%
- Daylight
- ~12 h 15 min
- Comfort score
- 93/100 · Great
What September feels like
Warm afternoons near 77°F (25°C) make long days outdoors easy.
Nights cool to an average low of 66°F (19°C).
Rain is moderate at about 2.1 in (54 mm) for the month.
Plan around September
September is one of Istanbul's best months on the climate data.
- Last warm month for a while: October highs fall to 68°F.
- Comfort holds steady from August (92 → 93/100).
- September sits inside the Apr – Jun, Sep – Oct window our Istanbul, Cappadocia & Ephesus route recommends.
What to pack for September
- Light, breathable clothes77°F afternoons
- Comfortable walking shoesmost picks involve some walking
What to do in Istanbul in September
With conditions on your side, the picks below favor time outside.
Topkapı Palace
Ottoman sultans' palace with courtyards, treasury and the Harem.
Mandabatmaz
Tiny Beyoğlu coffee spot famous for thick, foamy Turkish coffee.
Hagia Sophia
Sixth-century domed church, later mosque, with Byzantine mosaics.
Çiya Sofrası
Kadıköy restaurant reviving regional Anatolian dishes rarely found elsewhere.
Bosphorus Ferry
Public ferry cruise up the strait past palaces and wooden mansions.
Why now September scores 93/100 for comfort, good conditions for being outside.
Nearby in September
- Selçuk in September~228 mi · highs 92°F, 0.7 in rain · 8°C (14°F) warmer by day, drier
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Istanbul in September: quick answers
Is September a good time to visit Istanbul?
Yes. On the climate data it's one of the best months, scoring 93/100. Expect highs of 77°F (25°C) and 2.1 in (54 mm) of rain. September is inside the Apr – Jun, Sep – Oct window our Istanbul, Cappadocia & Ephesus route recommends.
How hot is Istanbul in September?
Average highs are 77°F (25°C) and average lows 66°F (19°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Istanbul in September?
Not much: about 2.1 in (54 mm) of rain falls across September on average, the 6th-wettest month of the year. The annual total is about 24.6 in (624 mm).
What should I pack for Istanbul in September?
Bring light, breathable clothes (77°F afternoons) and comfortable walking shoes (most picks involve some walking).
More on Istanbul
Routes in season in September
- Istanbul, Cappadocia & Ephesus Apr – Jun, Sep – Oct
Planning Istanbul in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.