Istanbul · AutumnMonth summary
Istanbul weather in September
✅ Good
🌡️ Temperature min / max
19°C – 26°C
🌧 Rainy days
23% of days
☀️ Sunshine
11.3h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
8.5/10
📅 📅 Best month
July (9.3/10)
Quick decision
Should you visit Istanbul in September?
✅ Good
✅ Yes if: you want good weather with lower prices than peak season.
❌ No if: you need guaranteed perfect weather — some mixed days are possible.
Our take: September is a good time to visit Istanbul. July remains slightly better (+0.8 pts).
By trip type
Istanbul in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ✅ Good
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Harvest season — fresh local produce at markets and restaurants Autumn in Istanbul is often underrated: 26°C, golden light and declining crowds. An interesting window. Rain risk remains low (23% of days), leaving good room for outdoor activities. A good balance between weather and crowds, even if July (9.3/10) remains theoretically better.
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All months for Istanbul
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 4°C | 10°C | 43% | 3.4 | 6.4h | 4.1/10 |
| 🌦️ February | 5°C | 10°C | 35% | 2.5 | 8.0h | 4.6/10 |
| ⛅ March | 6°C | 13°C | 35% | 2.3 | 9.4h | 5.8/10 |
| ⛅ April | 9°C | 17°C | 29% | 1.7 | 11.6h | 7.2/10 |
| 🌤️ May | 13°C | 21°C | 30% | 1.9 | 12.6h | 7.8/10 |
| ☀️ June | 19°C | 26°C | 21% | 1.3 | 13.9h | 9.0/10 |
| ☀️ July | 21°C | 29°C | 12% | 0.7 | 13.7h | 9.3/10 |
| ☀️ August | 22°C | 30°C | 8% | 0.5 | 12.3h | 8.9/10 |
| ☀️ September | 19°C | 26°C | 23% | 1.5 | 11.3h | 8.5/10 |
| 🌤️ October | 14°C | 20°C | 21% | 1.8 | 9.4h | 7.5/10 |
| ⛅ November | 11°C | 16°C | 31% | 2.9 | 7.8h | 7.0/10 |
| 🌦️ December | 7°C | 12°C | 42% | 3.1 | 6.8h | 4.4/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Istanbul averages 26°C, 23% rainy days and 11.3h of sunshine per day. Overall weather score: 8.5/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 9.3/10). Difference:
- 🌡️ Max temperature : +3°C
- 🌧 Rainy days : -11%
- ☀️ Sunshine : +2.4h/day
FAQ
FAQ — Istanbul in September
Is September a good time to visit Istanbul?
September is an excellent time to visit Istanbul (score 8.5/10). With 26°C, 11.3h of sunshine and 23% rain, conditions are very favourable.
What to do in Istanbul in September?
With 26°C and 11.3h of sunshine, all outdoor activities are possible: hiking, sightseeing and terraces.
Accommodation
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Activities & tours
Activities and tours in Istanbul
Guided tours, skip-the-line tickets and local experiences.
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