No month is medically wrong, but the thirty days afterwards differ a lot. August in Istanbul means an indoor recovery; October means eighty percent by June.
The operating room is climate controlled and healing biology does not keep a calendar. Nobody should postpone treatment for a season, and a clinic offering a seasonal discount is managing its own booking curve rather than your outcome. What genuinely changes with the season is the thirty days after surgery: how much you sweat, how much sun the scalp takes, and how comfortably you can cover it in public.
Istanbul runs 32 to 35 degrees through July and August. You cannot swim for four weeks, direct sun stays off limits for around three months, sweat irritates the healing area, and a hat is least comfortable exactly when you most need one. It is entirely doable and thousands of patients do it, but it means planning an indoor recovery rather than the holiday you had in mind.
October to November and March to April sit around 15 to 20 degrees in Istanbul. A hat is ordinary clothing rather than a burden, the sun is weak, flights and hotels cost less, and sweating is not a daily management problem. Autumn also has pleasant arithmetic behind it: operate in October and by month eight, the following June, roughly eighty percent of the result is already visible.
The question that matters more than season is what sits in your calendar. Crusts are visible for ten to fourteen days, redness lasts two to four weeks, and months three to six are the awkward phase when new shafts push through thin and uneven. If you have a wedding in five months we will tell you plainly that you will be in that phase, and suggest a date that puts it behind you.
No. Cold does not harm grafts and a loose hat is easier to wear in winter anyway. The only rule is not to pull tight woollen beanies on before week four.
Ask what changes clinically. If the answer is nothing, the discount is a booking tool. Choose the date that fits your recovery and your calendar instead.