What is the weather like in Istanbul in October and November?
From messages by 3 participants in 2 sources · Last activity: 16 days ago
Trip report for mid-October 2025: daytime average +20°C, cool evenings — a windbreaker or light synthetic jacket was enough. Rain occurred only once, and not for the whole day.
Mid-October: +20°C daytime
Different experience starting October 14 (last year): evenings required jackets and pants, and it rained frequently — contrasting with drier, warmer reports for the same period.
From Oct 14: frequent rain
In October 2025 it was cool overall — warm during the day but requiring a sweatshirt in the evenings. In contrast, October 2024 had excellent weather throughout the month.
October: warm days, cool evenings
Weather varies greatly year to year: October 2024 saw temperatures up to +28°C with swimming in the sea, while October 2025 was noticeably cooler. November 2025 turned out warmer than expected.
+28°C in October 2024, swimming possible
Istanbul's weather is notoriously unpredictable in autumn. October, November, and even December can feel similar temperature-wise. December evenings on the Bosphorus ferry can be very cold, while October mornings may bring heavy rain. The best strategy is to pack multiple layers, from light to warm.
Tip: pack multiple clothing layers