The best time to visit Istanbul is during spring (April to May) and autumn (September to October). During these months, the weather in Istanbul is mild, sunny, and comfortable for walking around the city. Daytime temperatures usually range between 15–25°C, which is ideal for exploring historical areas like Sultanahmet, Galata, and the Bosphorus coastline.
Spring is especially beautiful in Istanbul because of the Tulip Festival, when parks such as Emirgan Grove and Gülhane Park are filled with colorful flowers. Autumn, on the other hand, offers a calmer atmosphere with fewer tourists compared to summer, making it easier to enjoy popular attractions like Hagia Sophia, the Blue Mosque, and Topkapi Palace without long lines.
Summer (June to August) can be very crowded and hot, especially in tourist-heavy areas, while winter (December to February) is colder and rainy, although it can be a good option for budget travelers. For most visitors, spring and autumn provide the perfect balance of pleasant weather, manageable crowds, and a more local Istanbul experience.