Where to Go When the Netherlands Is Melting: A Practical Guide to Beating the Heat

The Netherlands is currently in the grip of a heat event that is, in the Dutch meteorological sense, genuinely unusual. To qualify as an official national heatwave, temperatures must exceed 25°C for five consecutive days at the KNMI station in De Bilt — with at least three of those days hitting 30°C or above. Regional heatwaves, declared locally when those conditions are met at any one of dozens of provincial KNMI stations, have been popping off across the south all week. The south crossed the threshold days ago. De Bilt is close.

This matters practically because the Netherlands now has more days with temperatures of at least 25°C, and summers have more tropical nights, with a minimum temperature of 20°C or higher. The country’s average annual temperature has risen by more than 2.5°C since 1901. The 2019 record high of 40.7°C no longer feels like a freak event. It feels like a preview.

And the infrastructure hasn’t caught up. Only about 4% of Dutch households have air conditioning. This is partly cultural — there’s a long-standing Dutch skepticism toward personal AC as excess, or at least as something that happens elsewhere — and partly practical, because until recently it wasn’t considered necessary often enough to justify the cost. Both of those calculations are changing fast. During the 2019 heatwave, over 100,000 people searched Marktplaats for mobile cooling units within a few days.

So where do you go? What can you do legally in and around the water? And what are the rules about using more of it at home? This guide covers all of it.

The Rules on Swimming in Canals — and Why They Exist

Let’s get this out of the way first, because it’s the thing most people want to know and the thing most people get wrong.

Swimming in Amsterdam’s canals is not allowed. The police confirmed this directly in an August 2024 Instagram post, warning people caught in the water face a €160 fine. The canals are crowded with boats, which increases the risk of accidents, and the water quality poses health risks.

Fines cited in different sources range between €140 and €170 — the inconsistency is real, not a typo, and reflects different enforcement periods and local ordinances. The number you’ll encounter depends on where and when you’re caught. Assume it’s expensive enough to matter.

The quality issue is the more important concern, and it’s not as straightforward as “the canals are dirty.” The water is now the cleanest it has ever been, but that doesn’t mean it’s safe. After heavy rainfall, the combined sewer system can overflow into the canal network, pushing in E. coli and norovirus-type bacteria. On dry days in a normal summer, the water can be relatively fine. On the day after a storm, it genuinely isn’t. You can’t tell by looking at it.

There’s also the practical hazard that when Amsterdam’s canals are “cleaned” — a process involving a crane extracting old bicycles, shopping trolleys, sharp metal scraps, and decades of submerged debris — the sheer volume of material recovered makes clear how much is still down there at any given point. Getting a foot or leg caught on something submerged is a real risk, not a theoretical one.

Each of the twelve provinces publishes an annual list of officially approved swimming spots. Between 1 May and 1 October, water quality at these locations is checked weekly by local water boards and by Rijkswaterstaat, the Ministry of Infrastructure and the Environment. Outside this system, you’re on your own.

The one exception added in 2025: the Marineterrein Binnenhaven in central Amsterdam became the first official swim location within the canal ring in spring 2025. Year-round access in theory, but no lifeguards. Swimming is at your own risk, and water quality and temperature are posted live on the Marineterrein website and on screens at the site.

The national resource for finding legal swimming spots is zwemwater.nl and the Zwemwater app, which lists around 800 designated swimming spots throughout the Netherlands, with directions, parking information, and nearby food and drink options. The app and website are in Dutch only.

The Rules on Boating in Canals

Boating is legal, actively encouraged, and governed by a fairly coherent set of rules that most rental operators will walk you through before you leave the dock.

The maximum speed limit on Amsterdam’s canals is 6 km/h — quicker than walking, slower than cycling. Exceeding it triggers fines starting at €95. Playing music on your boat is forbidden; enforcers can confiscate the equipment and issue a fine. Confetti, fireworks, and similar items are not allowed on board. Waste cannot be thrown overboard, with a cleaning fee of at least €50 charged if the boat is returned dirty.

Commercial traffic and tour boats always have the right of way. Keep to the right. Approach bridges slowly and visibly. Boats longer than 10 metres may not be moored in the canals without an exemption. Never moor to trees, bridge railings, lampposts, or bicycle racks, and do not moor near stairs or ropes designated for swimmers.

The “12+ rule,” implemented in May 2019, limits passenger numbers on pleasure craft to 12 people plus a skipper. Groups larger than that must book a licensed passenger vessel with a professional skipper. This was introduced to address the overcrowded and noisy boat problem that had been building for years.

Two-stroke outboard motors older than 2007 are not permitted within Amsterdam’s canals, except on the main city waterways like the Amstel or Kostverloren routes.

If you’re arriving with your own boat and want to moor in the city, you’ll need a vignette. A transit vignette (doorvaartvignet) costs €40 and is valid for three years. You do not need a vignette to access the IJ, the Noordzeekanaal, the Amsterdam-Rhine Canal, or most major commercial waterways. The Waternet app (available for iOS and Android) has a boating map, bridge opening times, and lock information.

For boat rental: you do not need a boating license for small self-drive boats in Amsterdam, though you must be at least 18 to operate one. Most rental operations rent electric boats by the hour or half-day; expect €15 to €25 per hour depending on the size of the boat and the company.

Water Usage: What’s Restricted and Why

The Netherlands is facing a water pressure problem that doesn’t get as much attention as the heat itself. After an extremely dry spring in 2025, groundwater levels dropped significantly below normal levels across much of the country, particularly in the east and south. The Rhine discharge in early April 2025 fell to 1,150 cubic metres per second — less than half of typical levels and the lowest recorded in fifty years for that period. In North Brabant, several water boards imposed extraction bans for groundwater irrigation starting from April 2025.

Whether those specific restrictions have continued or eased since depends on local conditions, and the decision rests with individual water boards (waterschappen), not the national government. There is no single national ban on garden watering or sprinkler use. But the structure exists to impose one, and in drought years, boards have used it.

In practice, what this means for residents during a heatwave:

Check your local water board. The Netherlands has 21 water boards, each with its own jurisdiction and authority to issue extraction restrictions. Rijkswaterstaat’s water management portal and individual water board websites are the authoritative sources. Amstel, Gooi en Vecht covers Amsterdam; Hollands Noorderkwartier covers North Holland; Rijnland covers the Hague-Leiden corridor; each province has its own.

Hosepipes and sprinklers. No national rule prohibits using a garden hose during a heatwave. But in declared drought conditions, your water board can restrict extraction from ditches, streams, and groundwater for garden use. Tap water is not covered by these restrictions — it comes from treated drinking water infrastructure — but voluntary reduction is consistently requested during hot dry spells.

Blue-green algae. During hot weather, safety warnings have been issued for swimming locations across the Netherlands due to algal blooms that thrive in warm stagnant water. Check zwemwater.nl before going in anywhere. Blue-green algae (cyanobacteria) cause skin irritation, gastrointestinal problems, and in significant exposure, worse. The Zwemwater app flags specific closures in real time.

Where to Actually Go When It’s This Hot

The North Sea Coast

The cheapest and most effective solution in the Netherlands is also the most obvious: the coast. Entry to all public Dutch beaches is free. All you pay for is getting there, parking if you drive, and whatever you eat and drink.

Zandvoort, in North Holland, has one of the longest beaches in the country — over 9 kilometres — and is less than 30 minutes from Amsterdam by direct train from Centraal. In 2025, the beach received its 15th Blue Flag certification for water quality and facilities. It has a nude beach section at the south end, a sports section at the north, and a long stretch of beach clubs in the middle where a sun lounger and umbrella rental runs €10–€20 per day depending on the pavilion.

Scheveningen, immediately adjacent to The Hague, is 4.5 kilometres of beach and received its 15th Blue Flag in 2025. It’s the busiest beach in the country by visitor numbers. The boulevard is fully developed — restaurants, terraces, the old pier — and the beach itself is well maintained with lifeguards during the summer season. From The Hague Centraal, tram 11 gets you there in 20 minutes.

Noordwijk offers over 12 kilometres of beach on the South Holland coast — in 2025 it received its 39th Blue Flag, which gives you some sense of how long the beach has been taken seriously as a swimming destination. Quieter than Scheveningen, less urban than Zandvoort. Train to Leiden, then bus 31.

For the best water and the most space, Zeeland is the answer. The Veerse Meer and the Grevelingenmeer are among the best swimming lakes in Zeeland. The water in the Grevelingenmeer is a former sea arm, now a saltwater lake closed off from the North Sea, which means it warms up faster than the open coast and has lower wave action. Popular with windsurfers, kiteboarders, and families. Renesse, on Schouwen-Duiveland, has long been the youth-destination beach of the Netherlands — busier and more festive than anything further north.

The coast warms to roughly 17°C to 20°C in summer. Cold by Mediterranean standards. Refreshing when you’re sweating at 35°C.

Lakes and Inland Spots: Nationwide

Admission to beaches and most designated swim spots in the Netherlands is free. You pay for parking (typically €2–€4/hour on the coast, often free inland), for food and drink, and for equipment hire where relevant.

Staying Cool in the City Without Going Anywhere

If you’re not up for traveling, there are options.

Museums with air conditioning. Museum buildings in the Netherlands are generally air-conditioned — sometimes the most efficiently cooled spaces in any given city. The Rijksmuseum, Stedelijk, and Van Gogh in Amsterdam all run AC. Tickets are €20–€25 typically, with discounts for under-18s, museum card holders, and city card users. This is not a free option, but it is a comfortable one.

Public libraries. Most central public libraries in Dutch cities are large, climate-controlled, and free to enter. The OBA (Openbare Bibliotheek Amsterdam) on Oosterdokskade is one of the biggest library buildings in the country and fully air-conditioned. No library card required to sit and read.

Cooling centers. During active heatwave plan periods, municipalities and GGDs (municipal health services) open cool spaces specifically for vulnerable people — the elderly, people living alone, people without adequate housing. Check your local municipality or GGD website. Amsterdam, Rotterdam, Utrecht, and The Hague all have heatwave protocols that include public cooling facilities when temperatures hit sustained highs.

At home. The classic Dutch method: close your shutters and curtains on the sunny side of the house before 10am, keep them closed until after sunset, then open everything to cross-ventilate at night. Dutch houses with south-facing windows and no external shutters are genuinely hard to cool this way, but it’s the baseline. A bowl of cold water with a fan blowing across it helps more than you’d think. A cooling towel or wet sheet works. A cold shower every few hours.

What doesn’t help much: keeping windows open during the day when outside air is hotter than inside air. The Dutch instinct to open everything to the sun is counterproductive when it’s 35°C. Close the house in the morning and open it at night.

The KNMI Heatwave System and What the Codes Mean

The Dutch weather agency KNMI issues weather warnings in three levels relevant to heat: code yellow (warm, pay attention), code orange (hot, take action), and code red (extreme, serious risk). The National Heatwave Plan, managed by RIVM, is triggered when KNMI forecasts roughly four consecutive days at 27°C or above. When activated, it cascades alerts to care providers, municipalities, and health organisations to increase welfare checks on elderly and vulnerable people.

By June 2026, the heatwave plan had been activated 20 times in total since its 2010 launch. Each activation marks a period where the health system explicitly shifts into heat-response mode. The plan has been credited with substantial reductions in heat-related mortality since 2010, particularly among the most vulnerable groups — though the causal chain is hard to isolate.

If you’re in the Netherlands with elderly relatives, housemates who live alone, or neighbors who aren’t mobile: check on them. The RIVM’s core message during these alerts, since 2024, has been “look after each other” rather than just “protect yourself.” It’s the more accurate framing.

Current KNMI forecasts and heatwave status are at knmi.nl. The RIVM heatwave plan details and public health advice are at rivm.nl/en/heat.

A Note on the Longer Picture

The heat isn’t an anomaly anymore. In the Netherlands, the rate of warming since 1991 — roughly 0.4°C per decade — is twice the global average, and under KNMI’s high-emissions scenarios, the number of tropical nights (minimum temperature above 20°C) per summer is projected to rise from the current 0.3 nights to 3 or more by 2050.

The 2025 drought, while not as severe as 2018 in its starting conditions, saw Rhine discharge fall to levels not seen in fifty years for the period. Water boards started imposing extraction bans earlier than in 2018. Groundwater levels in the sandy soils of the east and south were already at levels typical of May or June by early April. The aquifers take weeks of sustained rain to recover, not a single storm.

This is not alarmism. It’s hydrology. The Netherlands has world-class water management infrastructure, and the country is adapting — faster than most. But the infrastructure was designed for a different climate, and it’s being updated on the fly. The beaches are still there. The lakes are still swimmable. The canals are cleaner than they’ve been in a century. It’s still a remarkably good country to be in when summer comes.

Basically, don’t jump in the canal. The fine is real, the bacteria are real, and there’s a perfectly good lake about twenty minutes away by bike.