Pack the waterproofs if Istanbul's on your itinerary this week. The city's disaster coordination centre, AKOM, has issued a warning for heavy rain and storms kicking in from Sunday evening, with unsettled conditions expected to drag on until Wednesday night.
The setup is a classic Marmara autumn: a cool, rainy front pushing in from the Balkans. Combine that with the poyraz — the strong northerly wind that funnels humid Black Sea air over the city — plus cold air aloft sitting on top of warmer air near the ground, and you get the recipe for thunderstorms and lightning.
Rain will fall on and off through the day but ramps up sharply from 7 p.m. Sunday. The European side, the Bosporus corridor, northern districts and the Asian side are all in line for the worst of the showers. Citywide totals of 30–60 mm are forecast through Wednesday, but northern districts — Çatalca, Arnavutköy, Eyüpsultan, Sarıyer, Beykoz, Çekmeköy and Şile — could see 60–100 mm, with some spots topping 100 mm. That's a serious amount of water in a few days.
Wind is the other headache. Northerly gusts will hit storm strength at times, blowing at 30–60 km/h on and off all week. Temperatures will slide too, dropping from around 20°C now to roughly 15°C by midweek — noticeably chillier than early-autumn visitors usually expect.
The city is getting ready. Istanbul's metropolitan municipality has cleared drainage grates, stormwater inlets and streams, put on-call crews on shift outside normal hours, and checked rainwater pumps at low-lying underpasses, coastal squares and other flood-prone spots. Residents are being told to stay alert for flooding and storm damage.
If you're travelling: keep an eye on ferry and Bosphorus services, which can be disrupted when the wind picks up. Expect slower traffic and possible localised street flooding, especially in lower-lying areas and underpasses. A folded rain jacket and decent shoes will earn their place in your bag, and it's worth swapping any rooftop or Bosphorus-side dinner plans for somewhere indoors on the wettest evenings. The upside? Stormy skies over the Golden Horn and the Hagia Sophia make for some dramatic photos — once you've dried off.
