Istanbul Weather in September

September weather on the streets

September is a comfortable month for seeing Istanbul on foot: the average high is 26°C and the low is 19°C, with 7.4 hours of sunshine a day. Walk between Hagia Sophia, the Blue Mosque and the Basilica Cistern, or take a Bosphorus ferry without the stronger summer heat. Rain falls on 8 days, so showers can interrupt a day out; keep indoor stops such as the Istanbul Archaeological Museums in mind. The afternoon can still feel warm in the exposed courtyards around Sultanahmet, so save longer walks for later in the day.

Events, crowds and costs

September is the start of the school year in Turkey, though the exact opening date varies. That brings local families back into the city and can make traffic around Taksim and the Historic Peninsula busier. Tourist crowds generally ease after the summer peak, while the pleasant weather keeps September popular; accommodation can cost less than in August, but Istanbul is not yet in its quiet winter season. The Istanbul Biennial is held every other year, often across September and later autumn, so it may add exhibitions and visitors in edition years.

A useful local tip

For a calmer Bosphorus outing, take a Şehir Hatları ferry from Eminönü towards Üsküdar, then explore the waterfront on the Asian side. September's 12.3 hours of daylight leave time to enjoy the crossing and return before evening. If rain arrives, duck into the covered stalls of the Spice Bazaar near Eminönü for Turkish delight and a sheltered break.