When to go · Istanbul

Istanbul in September

Great month. Warm; best light.

Key facts

Verdict: Great
Temperature: 25°C (77°F)77°F (25°C) / 18°C (64°F)64°F (18°C); average high / low
Rain days: 5
Crowds: Medium; Türkiye (Turkey) overall
Prices: Medium; Türkiye (Turkey) overall

Plan around it

Verdict

GreatVoykit month rating for Istanbul

Warm; best light.

All twelve months in one grid — weather, crowds and prices, with gaps left as unknown.

No other month rates higher than September for Istanbul in this guide.

Long-term averages

IstanbulHighs around 25 °C (77 °F), lows around 18 °C (64 °F), rain on about 5 daysHighs around 77 °F (25 °C), lows around 64 °F (18 °C), rain on about 5 days
Istanbul and Marmara, Türkiye (Turkey) · Istanbul, Bursa, Edirnebest weather
Wet, windy winters with occasional snow; humid 30 °C (86 °F) summers; May and September–October are the easy windows.Wet, windy winters with occasional snow; humid 86 °F (30 °C) summers; May and September–October are the easy windows.

Autumn season

The best walking weather and clearer light.

Watch: Rain returns in November; 29 October holiday.

Türkiye (Turkey) overall: The best month for most trips: warm sea, cooling ruins, lower prices after mid-month.

Weather, crowds and prices for any two months in Istanbul, side by side.

First month

Second month

September: Warm; best light.

May: Warm; long days; crowds building.

Istanbul: figures are long-term averages from this guide, not a forecast.

Nothing unusual for the weather this month.