The Istanbul Governor's Office has warned residents of heavy showers and thunderstorms expected to hit the city from tonight, intensifying from tomorrow morning onwards.
According to assessments by Turkey's General Directorate of Meteorology, the showers and thunderstorms beginning overnight are set to strengthen as the morning progresses.
Northerly winds are forecast to blow strongly at 40 to 60 km/h, at times reaching short-lived gale force of around 70 km/h.
Temperatures are also expected to fall noticeably with the rain tomorrow, dropping 3 to 5 degrees Celsius below seasonal norms.
Authorities urged Istanbul residents to take precautions against the adverse weather conditions.