How to deal with summer heat in Istanbul: best times to sightsee and what to wear?

If the late-July heat in Istanbul gets overwhelming, a short escape to the Princes' Islands or the Black Sea coast for a couple of days is a good option — a nice alternative to beach resorts.

Late September in Istanbul feels like summer — warm and pleasant. A jacket is overkill; at most bring a light cardigan for evenings.

September in Istanbul offers mild, warm weather without oppressive heat. Regular autumn visitors say a jacket is unnecessary — it's genuinely summer-like.

Mid-July in Istanbul is genuinely hot. The strategy: go out early morning before 10am or after 6pm when it cools down. Spend midday in air-conditioned museums or cafes.

Nobody wears a windbreaker in Istanbul in August — it's a summer city. Light natural-fabric clothing, sunscreen, and a water bottle are all you need.