Rain does not cancel a Bosphorus cruise. The boats have enclosed lower decks with seating and windows, and sailings operate through it. What stops a cruise is wind, and specifically what the wind does to the current in the strait, which is a separate problem from rainfall.
Here is what to do about it.
- Do not cancel your booking because of the forecast. Rain is not a cancellation reason and you will lose the slot for nothing.
- Do check the wind, not the rain. A strong southwesterly is what disrupts boats here.
- Do bring a packable waterproof rather than an umbrella. Umbrellas are unusable in wind on a deck.
- Do wear closed shoes with grip. Wet decking is slick.
- Do go outside at the bridges anyway. Rain photographs better on the water than most people expect.
- Do not book a cruise for the hour before a flight. Weather delays and reschedules happen.
- Do check the operator’s cancellation window. Most run 24 hours, and a weather cancellation from their side is a full refund or a date change.
- Do not assume winter rain will pass. Istanbul winter rain is persistent drizzle rather than short bursts.
Do Bosphorus cruises run in the rain?
Yes. Every scheduled sailing on the strait uses a vessel with an enclosed lower deck, heated in winter and air conditioned in summer, with large windows and seating. On a dinner cruise, the tables, the kitchen and the stage are all inside. On a sightseeing sailing, the commentary and the seats are inside and the upper deck is the optional part.
The practical consequence is that rain changes where you sit, not whether you sail.
What you lose in rain is the open deck for the parts of the route where it matters most, the two bridge passes and the palace shoreline. What you keep is the entire route, the commentary, the food if you booked a dinner cruise, and the shoreline seen through glass.
What actually cancels a Bosphorus cruise
Three things, and rain is not among them.
Wind, particularly the lodos. The southwesterly that blows across Istanbul from October to April, peaking in December, is what disrupts shipping here. It arrives in clear weather without warning, is strongest in the afternoon, and can blow for days. Annual peak gusts typically reach 80 to 100 km/h and have historically reached 150.
Reversed current. This is the part most visitors have never heard of and it is the real mechanism. The Bosphorus normally runs a two layer flow, a southward surface current from the Black Sea over a northward deep current from the Marmara. A sustained southwesterly reverses the surface current, producing what Turkish mariners call orkoz. The Turkish straits traffic regulations name lodos driven orkoz explicitly as a trigger for suspending traffic, at the same tier as a current of six to seven knots. Above seven knots, transit stops in both directions.
Fog. Istanbul averages around sixty foggy and misty days a year. Under the straits regulations, visibility below one nautical mile reduces the strait to one direction, and below half a nautical mile transit closes entirely. Fog is the most common single cause of Bosphorus shipping closures.
Snow and heavy storms also stop sailings, usually via the wind rather than the precipitation itself. January and February are when this is most likely, and Istanbul ferry services across the city were suspended on several January days in recent years.
How you find out a sailing is cancelled
Private cruise operators contact you directly, by phone, message or email, using the details on the booking. Check the number you gave is one you can be reached on abroad.
For the scheduled public ferries, which some visitors use as a cheap alternative to a cruise, the city operator publishes cancellations on its own website and social channels, and the city’s disaster coordination centre and the governor’s office amplify storm warnings. Cancellations are decided route by route rather than city wide, and the most exposed routes go first. The Princes’ Islands lines and the open Marmara crossings are the first to stop. The sheltered Golden Horn and short Bosphorus crossings hold out longest.
There is no published wind speed at which the ferries stop. Decisions follow the meteorological service’s storm warnings, and anyone quoting a specific threshold is guessing.
What happens to your booking
| Situation | What typically happens |
|---|---|
| It rains | Sailing operates as normal, no refund and none needed |
| Operator cancels for weather | Full refund or a date change, at your choice |
| You cancel more than 24 hours ahead | Free cancellation on most bookings |
| You cancel inside 24 hours because of the forecast | Usually non refundable, since the sailing is still running |
| You do not turn up | Treated as a no show, no refund |
| Sailing is shortened or rerouted | Varies by operator, ask at the pier |
The distinction that matters is who cancelled. If the operator cancels, you are covered. If you cancel because you looked at a forecast, you are inside your own cancellation window and the normal rules apply.
Confirm the specific terms when you book, because they differ between operators and between group sailings and private charters. Charter terms are generally stricter, since the boat and crew are committed to your date.
When rain is most likely
| Month | Avg rainy days | Avg rainfall | Character |
|---|---|---|---|
| December | 15.5 | 99 mm | Wettest month, persistent drizzle, grey |
| January | 16.3 | 89 mm | Most rainy days, spread thin, snow possible |
| February | 13.9 | 71 mm | Snowiest month on the strait |
| March | 12.6 | 62 mm | Improving, still cold on the water |
| April | 10.1 | 48 mm | Showery, sea still cold |
| May | 7.5 | 33 mm | Drying out |
| June | 5.4 | 28 mm | Thunderstorm peak |
| July | 3.5 | 22 mm | Driest month |
| August | 3.6 | 24 mm | Dry, windiest by average wind speed |
| September | 5.5 | 40 mm | Second thunderstorm peak |
| October | 9.5 | 66 mm | Rain returns |
| November | 11.3 | 78 mm | Wet and dark, early sunsets |
Two patterns worth knowing. Istanbul has a thunderstorm double peak, June and September, with a lull through the driest part of high summer. And winter rain here is unusual for the region in being frequent and light rather than short and heavy, with January averaging more rainy days than December despite less total rainfall.
What to bring when the forecast is wet
A packable waterproof with a hood. The single most useful item. It works on the open deck in wind, where an umbrella does not.
Closed shoes with a rubber sole. Wet decking is slippery and the boat moves.
A dry bag or a plastic sleeve for your phone. Spray plus rain on an open deck is more water than a pocket handles.
A microfibre cloth. For the camera lens, which will fog and spot constantly.
One more layer than the forecast suggests. Rain plus wind over cold water is considerably colder than the same temperature on shore, because the strait channels air between two seas and the boat adds its own speed to it.
Leave the umbrella at the hotel. On a moving deck it is a liability rather than a help.
Is a Bosphorus cruise worth doing in the rain?
More often than people expect, and for reasons that are not obvious.
The boats are quieter. Rain thins the passenger numbers, which means the upper deck rail positions are free and the window tables on the enclosed deck are available.
The light is better for some subjects. Overcast light is even and does not blow out the pale stone of the palaces the way midday sun does. Wet stone is darker and more saturated.
The shoreline changes character. Low cloud over the hills at Kandilli and Bebek, mist on the water, the bridges disappearing into it. This is a different city from the summer postcard and it is worth seeing.
Winter sailings have the shortest booking lead times. Something you can decide on the day rather than a week ahead.
The honest counterweight. In heavy persistent rain you will spend most of the sailing behind glass, the windows fog, and if you booked specifically for the open deck and the sunset, you have not got what you came for. In that case moving the date, which most operators allow up to 24 hours ahead, is the better call than sitting inside for two hours.
How to decide the day before
Look at the wind speed, not the rain percentage. A 70 percent chance of rain with light wind is a sailing that runs and is pleasant enough. A dry forecast with a strong southwesterly is the one that gets cancelled.
Check whether a storm warning has been issued. The Turkish meteorological service issues these for the Marmara and they are the trigger operators act on.
If you are booking for a specific sunset, move it. Overcast means no golden hour, and a sunset cruise in flat grey light is a different product from the one advertised. Most operators allow a date change inside the same window as a cancellation.
If you are booking for the dinner and the show, keep it. All of that happens inside and rain makes no difference to any of it.
If you have one evening in Istanbul, keep it. A rainy cruise is better than no cruise, and the alternative is usually a restaurant.
What about private charters?
Private boats face the same weather but a different calculation, because the charter is booked for a specific date and the terms are stricter.
Small open yachts are the wrong choice for a winter booking, since there is limited enclosed space and a February northerly across open water is genuinely unpleasant. If you are chartering between November and March, book a covered boat. The fleet and what each vessel offers is on the yacht rental page.
Charters also have more flexibility once you are on board. A private captain can shorten the route, stay in the sheltered lower strait, or wait out a shower in a bay, none of which a scheduled boat can do.
Booking with weather in mind
Two practical rules for planning around this.
Do not put a cruise on your last evening. If it is rescheduled, you have nowhere to move it to. Put it on your second or third day so there is room to shift.
Do not connect a cruise to a flight the same evening. The Bosphorus is a working international waterway and the coast guard closes sections at short notice. Operators reschedule when that happens, and a tight connection turns an inconvenience into a missed flight.
Compare sailings and book here, with free cancellation up to 24 hours before departure on standard bookings.
Frequently asked questions
Do Bosphorus cruises get cancelled for rain?
No. The boats have enclosed lower decks and sailings run in rain year round. Cancellations come from strong wind, reversed currents in the strait and fog, not from rainfall.
What happens if my Bosphorus cruise is cancelled?
Operators offer a full refund or a date change when they cancel for weather. If you cancel yourself, the standard terms apply, which on most bookings means free cancellation up to 24 hours before departure and no refund after that.
Can you get a refund if it rains?
Not usually, because the sailing still operates. Rain is not a cancellation reason. If you want to move the date because of a forecast, do it more than 24 hours ahead, which is inside the free cancellation window on most bookings.
Is there indoor seating on a Bosphorus cruise?
Yes, on every scheduled sailing. The lower deck is enclosed with windows and seating, heated in winter and air conditioned in summer. On dinner cruises, the tables and the entertainment are all inside.
What is the rainiest month for a Bosphorus cruise?
December, averaging around 99 mm over fifteen or sixteen rainy days. January has more rainy days at sixteen but slightly less total rainfall, so the rain is spread thinner. July and August are the driest, with three or four rainy days each.
Should I book a cruise if the forecast is bad?
If the forecast is rain, yes. If the forecast is a strong southwesterly or a storm warning for the Marmara, move the date. Wind is what stops boats here, and it is a more useful thing to check than the rain percentage.
Is it worth going on a cruise in winter?
Yes, with the right expectations. The boats are quieter, booking is easier, the light suits the shoreline and the city looks different under cloud. Dress properly, because wind over cold water in December is a serious proposition on an open deck.
Do the public ferries stop in bad weather?
Sometimes, route by route. The exposed Princes’ Islands and Marmara crossings stop first, while the short Bosphorus crossings and the Golden Horn run longer. Cancellations follow meteorological storm warnings and are announced by the ferry operator on its own channels.
