Engine off and into the water - still the best way to cool off at sea. A fender on a floating line is just as much a part of the bathing routine as unfolding the bathing ladder in good time. And don't forget to reapply sun cream after swimming!
According to the laws of physics, evaporation creates cold. This can be utilised in somewhat inelegant ways, for example by hanging damp cloths in hatches and companionways to protect yourself from the summer heat. The smart solution: wet your cap and T-shirt regularly - the effect is naturally greatest directly on the skin. Incidentally, bottles also cool down when a wet sock is put on them.
Fans are available for just under 10 euros, which are connected via USB plugs - ideally via a battery bank on board. If conditions permit, the deck fans can be turned into the wind with the opening for fresh air supply. And when at anchor, the use of a windscoop is recommended: The bag catches the breeze and directs it through the hatch into the interior of the boat.
In well-insulated containers, ice cubes for refreshing drinks can easily stay frosty for a day - even in the heat. However, ordinary insulated bottles are somewhat impractical due to their usually narrow necks. It is much easier with wide-necked insulated containers for food. Despite the now very effective insulation, make sure that the container is not exposed to direct sunlight.
The company Evapolar offers a mini "air conditioner" in cube form with a USB connection for around 240 euros. It works on the principle of evaporative cooling. A cartridge is continuously moistened with fresh water, which evaporates. The power consumption is said to be just 10 watts; connected to a battery bank, no fixed installation is required. Cooling is said to be sufficient for around three square metres. A replica is now also available for a tenth of the price.
In the northern climes, permanently installed biminis are not common. But when the sun is sizzling mercilessly, shade still needs to be provided. So a temporary solution is needed.
Travelling during the hottest part of the day can be a pain, especially on downwind courses. This can be countered with an adapted itinerary. If the sailing schedule allows, an early departure may make it possible to be in cool rooms or on the beach during the critical phase. The same applies to a late departure in the evening. You can also generally avoid the worst of the heat. A Mediterranean cruise in midsummer, for example, can be a real heat ordeal. Perhaps the trip can be moved to the early or late season? Or to an area with a more pleasant climate?
This measure is common practice in motorhomes: windows and hatches are covered with reflective film. It doesn't look pretty, but it works. And if such cloths are tailored to the skylights, the appearance does not suffer too much. If needed spontaneously, it is advisable to use a rescue blanket, which has also proved its worth with motorhome travellers. Reflective inserts are also available for use from the inside, but heat can build up between the window and the film.