Weather in Istanbul in September
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Istanbul.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youIn September, Istanbul sees average highs of 25.9°C (78.6°F) and lows of 18.7°C. Conditions are warm and moderately rainy (5 rainy days), with roughly 11.2 hours of sunshine a day. Weather-wise, this is one of the most reliable months to travel. For the complete picture, see the best time to visit Istanbul — every month compared. Once you know when to go, find your Istanbul packing list at 247PackingList.
Get ready for Istanbul in September
Search flights to Istanbul
Compare 100+ airlines for September — one search, best price.
Search Flights →Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →What to pack for Istanbul in September
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
Compare all months in Istanbul
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 10.0°C | 94.4mm | 10/10 |
| February | 10.2°C | 82.4mm | 10/10 |
| March | 11.0°C | 82.1mm | 10/10 |
| April | 15.5°C | 78.5mm | 10/10 |
| May | 21.0°C | 55.5mm | 10/10 |
| June | 25.1°C | 58.4mm | 10/10 |
| July | 29.4°C | 20.1mm | 10/10 |
| August | 30.0°C | 16.1mm | 10/10 |
| September | 25.9°C | 40.8mm | 10/10 |
| October | 20.9°C | 47.5mm | 10/10 |
| November | 16.6°C | 103.4mm | 9/10 |
| December | 12.9°C | 68.6mm | 10/10 |
Full month-by-month guide: best time to visit Istanbul →
For facts about Turkey — currency, language and dialling code — see our Turkey country guide at 247CountryInfo. Travellers also find it useful to keep a Istanbul travel guide to hand. Check clothing sizes in Turkey before you shop.
Frequently Asked Questions
Is September a good time to visit Istanbul?
September rates 10/10 for visiting Istanbul — excellent time to visit. Expect average highs of 25.9°C, 40.8mm of rain across the month and about 11.2 hours of daily sunshine.
What is the temperature in Istanbul in September?
In September, Istanbul has average highs of 25.9°C (78.6°F) and average lows of 18.7°C (65.7°F).
Does it rain in Istanbul in September?
Not much. September averages just 40.8mm of rain in Istanbul — the odd shower is possible but most days stay dry.
What should I wear in Istanbul in September?
For Istanbul in September (25.9°C highs / 18.7°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts.
More essentials for Istanbul in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.