Boat tours in the rain

Boats in Helsinki sail in the rain, and the loop boats have an indoor saloon, so the question is not whether you will be comfortable but whether you will see anything. Helsinki gets about 675 mm of rain a year, spread fairly evenly; March to May are the driest months at around 35 mm each and August is the wettest at around 80 mm. Finnish rain usually arrives and leaves rather than settling in. The real enemy of a sightseeing loop is not rain — it is low cloud.

Annual rainfallAbout 675 mm

Driest monthsMarch to May, about 35 mm each

Wettest monthAugust, about 80 mm

Summer sunshine7 to 9.5 hours a day

Winter sunshine1 to 2.5 hours a day

Annual sunshineAbout 1,780 hours

What actually gets cancelled

Very little, and not for rain. The Suomenlinna ferry is public transport and runs every day of the year, in rain, in snow and in the dark. The ships to Tallinn and Stockholm are large vessels on a schedule. The sightseeing loops normally sail in wet weather because a wet passenger is an inconvenience and a wet boat is just a boat.

What can change a day is wind rather than water from the sky. A hard wind out of the open water makes a sundeck unusable and can shorten or alter a route. Operators make that call on the morning, and there is nothing useful you can do about it except keep the day flexible. Whether the water itself gets rough is a separate question, answered on the rough sea page.

The difference between rain and cloud

This is the distinction worth carrying away. In rain, you sit in the saloon, you watch water running down a window, and when the shower passes you go out on deck and the light afterwards is often the best of the day. In low cloud, the islands are grey shapes and the fortress walls are a suggestion, and no amount of commentary rescues that. If the forecast says showers, go. If the forecast says the cloud is on the water all day, and your trip allows it, move the loop and take the ferry instead.

The ferry is the right answer in poor visibility because it is not selling you a view. It is taking you somewhere, and the somewhere — walls, tunnels, museums, the submarine Vesikko, cafes — works perfectly well in weather. The ferry page.

Month by month, honestly

March, April and May are the driest months of the Helsinki year, at around 35 mm each. The sightseeing fleet only appears at the end of that run, roughly from May, but if you are here in spring you are in the driest part of the calendar.

June and July bring seven to nine and a half hours of sunshine a day and the warmest weather — July averages about 18 °C with highs around 22 °C. Showers happen and pass.

August is the wettest month at about 80 mm, and also warm and fully in season. Book flexibly.

September is a shoulder month with a real chance of cold nights and rain, and the best light of the year on the channels between the showers.

October to April has no sightseeing fleet at all. January and February give one to two and a half hours of sunshine a day and February averages about four degrees below zero. The ferry still runs. The winter page.

What works

Loop boats have a heated indoor saloon, so rain is survivable
Showers pass quickly here and the light afterwards is often the best
The Suomenlinna ferry runs in any weather, every day of the year
March to May are genuinely dry months
The standard loop offers free cancellation up to a day before

Worth knowing

Low cloud removes the entire reason for a sightseeing loop
Wind, not rain, is what shortens a route or empties a sundeck
August is the wettest month and is also peak season
Umbrellas are useless on an open deck
A saloon window is not the same product as a sundeck

What to do about it practically

Book the flexible option. The standard archipelago loop offers free cancellation up to twenty-four hours before. That is the single most useful weather tool you have: book it for a day in the middle of your trip and move it if the sky is wrong. The loop page.

Keep the ferry in your back pocket. It runs every day, needs no booking, and takes a city ticket. A wet morning is a fortress morning.

Go out anyway if it is showers. A Finnish summer shower is twenty minutes. The channels after rain, with the light coming back, are the reason to be on the water at all.

Dress for it. A hooded windproof layer, not an umbrella. Full list on the clothing page and the packing page.

Local tip

Look at the cloud base rather than the rain symbol. If you can see the top of the cathedral and the far side of the South Harbour clearly, the loop will show you what it promises. If the Katajanokka cranes have gone soft at the edges, the islands will be grey shapes and I would take the ferry instead.

Wind, spray and the sundeck

Even on a bright day the sundeck empties the moment the boat leaves the shelter of the islands. That is not weather, that is physics, and it happens in June as readily as in September. The wind comes across the open water at Market Square before you have even boarded. Bring the layer.

On the RIB, weather is part of the product: it is a speed boat, goggles and life jackets are supplied, and you will get wet regardless of the forecast. Dress for that rather than for the day. The RIB page.

The most sheltered options

If the weather is genuinely poor and you still want water, the order is: the Tallinn ferry, which is a large ship with restaurants and shops and a crossing of about two hours; the private boat, which has a canopy and closed weather protection; the evening cruise, which has a covered saloon, a bar and toilets; and the Suomenlinna ferry, which has a heated cabin and is over in fifteen minutes.

Leaves from Market Square

Check dates & book

One reminder, because it is the mistake I watched most often from the kiosk: the widget above books a sightseeing boat, not the ferry to Suomenlinna. The ferry is run by HSL as part of the city’s public transport, you buy it the way you buy a tram ride, and nobody sells a separate ticket for it here. The ferry has its own page.

We are an independent guide, not a boat operator and not a ferry company. Booking links go to GetYourGuide and are affiliate links — if you book through them we may earn a small commission, at no extra cost to you. See our affiliate disclosure.

Frequently asked questions

Do Helsinki boat tours run in the rain?

Normally yes. The loop boats have an indoor saloon and the Suomenlinna ferry runs every day of the year. Wind is more likely than rain to change a route: the rough sea page.

Is a boat tour worth doing in bad weather?

In showers, yes, because they pass and the light afterwards is often the best of the day. In low cloud the islands are grey shapes and I would take the ferry to Suomenlinna instead.

Which month is the wettest in Helsinki?

August, at about 80 mm, and it is also peak season. March to May are the driest, at about 35 mm each. The year totals about 675 mm: the season page.

Can I cancel if the weather turns?

The standard archipelago loop offers free cancellation up to twenty-four hours before, which is the most useful weather tool you have: the loop page.

Should I bring an umbrella on the boat?

No. An umbrella on an open deck lasts about ninety seconds. Bring a hooded windproof jacket: what to wear.