Istanbul Weather in September

Istanbul in September averages 25°C (77°F) during the day and 19°C (66°F) at night. Some rainfall is typical for this time of year.

Rainfall in Istanbul in September

The climate data from previous years indicates about 6 days of rain, averaging 51 mm (2 in) for the month. The rain this month typically falls in concentrated bursts rather than all-day showers. Expect a few heavier spells rather than constant grey skies.

Temperature in Istanbul in September

If you're visiting Istanbul in September, expect excellent temperatures with highs of 25°C (77°F) and overnight lows of 19°C (66°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 19°C (66°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Istanbul in September

The month enjoys around 235 hours of sunshine, creating mostly sunny days with good weather conditions.

Average water temperature in September

The water temperature is 23°C (73°F), which most people find very comfortable. A good month for swimming and water sports.

So this is a great month to visit if you prefer dry days with pleasant temperatures.