Istanbul weather in September
September in Istanbul: warm, dry — one of the best months to visit.
#2 of 12 months in Istanbul · #116 of 604 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Istanbul climate normals — September
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 67°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 26 mm / 1 in | ☀️ dry |
| Rainy days | 5 days | |
| Humidity | 68% | 💧 humid |
| Dew point | 16°C / 60°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 12.5 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 52 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Istanbul in September — FAQ
- Is September a good time to visit Istanbul?
- September in Istanbul: warm, dry — one of the best months to visit. It ranks #2 of 12 months for Istanbul on SeasonMap's comfort score (88/100).
- What is the weather like in Istanbul in September?
- In September, Istanbul averages a daily high of 25°C and a low of 19.2°C, with about 26.1 mm of rain over roughly 5 rainy days.
- What is the air quality in Istanbul in September?
- Istanbul has a mean US Air Quality Index of about 52 in September.