Istanbul weather warning: Heavy rainfall expected on October 27

Meteorological experts and the Istanbul Governor's Office have issued warnings regarding heavy rainfall and thunderstorms expected in Istanbul on Tuesday, October 27, 2026. Rainfall is projected to intensify starting in the morning, with amounts estimated between 21 to 50 kilograms per square meter across the city, and potentially reaching up to 75 kilograms in districts such as Arnavutköy, Sarıyer, Beykoz, Eyüpsultan, and Şile.

Meteorology expert Prof. Dr. Mikdat Kadıoğlu highlighted that the most intense precipitation is expected between 03:00 and 12:00, a period coinciding with morning commutes. He warned of potential risks including flash floods, traffic congestion, and disruptions to school services.

As of now, there has been no official decision to cancel schools or universities. The Istanbul Governor's Office has advised citizens to remain cautious of sudden flooding, strong winds reaching speeds of 40 to 60 kilometers per hour, and potential transportation disruptions.