Staying Cool on the Water

Need relief from the heat? Take a refreshing dive into our archives.

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As the first of what will likely be many heat-waves this summer is driving many people indoors, it is a good time to make sure that you are well-equipped to deal with the soaring summertime temperatures. Fortunately, summer temperatures are almost always cooler near the water. Which is good, since we doubt many our readers would skip sailing just because it’s hot out.

During our decade of cruising, my partner and I spent most of our days within 20 degrees of the equator. In many tropical ports the temperatures pushed to almost unbearable levels. I recall specifically the Solomon Islands, Guam, and Thailand, where the glue holding my shoes together literally melted. Over time, we adapted some effective strategies for staying cool. Scrolling through the archives, I was able to find several articles to help us all ease into the season of heat.

UV PROTECTION

First things first. Although I’m specifically addressing heat here, I can’t ignore the very real risks of UV rays, which are directly linked to skin cancer. I addressed UV protection in more detail in my link-laden Inside Practical Sailor blog post, “Sunscreen and Sun Protection for Sailors.”

Ensuring you are protected from UV is fairly straightforward thanks to standards widely popularized by the American Cancer Foundation and the Skin Cancer Foundation. UV protection is rated two ways. Sunscreens are rated by their sun protection factor (SPF). Fabrics are rated by the ultraviolet protection factor (UPF). The American Cancer Society and the Skin Cancer Foundation recommend sunscreens with SPF ratings of 30 and at least UPF 30 for protective clothing. 

We found that waterproof sunscreens that rely on physical blockers like zinc oxide or titanium dioxide to be the most effective in our sunscreen tests. Reapply frequently (every two hours). In our most recent testing, we found that most colored t-shirts–even those without an UPF rating–easily exceed the Skin Cancer Foundation’s recommended 30 UPF. This finding supports the conclusion of our previous report on UV-protective clothing: You don’t have to spend a fortune for a high-UPF shirt.

Be aware that popular awning products like Phifertex, advertised as being UV resistant and having a “shade factor” of 70 percent, aren’t very effective at blocking UV rays. The advantage of these flow-through fabrics is that they allow the breeze pass, making them popular for side awnings—just don’t count on them keeping you safe from UV. Even when you are in the “shade,” a shirt, hat, and sunscreen is recommended.

SIESTA

The Spanish have given tropical sailors from workaholic nations a wonderful gift—a guilt-free afternoon nap. Rise early and spend the hottest hours in the shade reading, napping, or stitching sails. To keep your bunk cushions smelling fresh in humid climates, see my Inside Practical Sailor blog post “Stop Boat Mattress Cushion Mildew.”

HYDRATE

Coconut water is a great source of electrolytes. Drinking nuts are bulky to store, but the popularity of packaged coconut water means it’s available almost anywhere. We tested a few of these drinks back in 2010 with a report on staying hydrated at sea (see PS June 2010 “What is the Best Way to Stay Hydrated at Sea?”).

SHADE

A good awning is essential for summer.  Sunbrella remains our favorite choice of material for the long haul, but some challengers like Stamoid and Weather Max have their converts (see PS December 2011, “Functional Fabrics”). Taylor Made, Crawford Marine and other companies offer domed designs that stow compactly (see PS October 2013, “A Reversible Awning”). Technical Editor Drew Frye’s dual-purpose awning is perfect for low-budget sailors (see PS June 2021 “Turn that Riding Sail into an Awning”). Sailrite (www. sailrite.com) also offers kits for the DIY stitcher, and our oldie-but-goodie from 1999 (search the PS website for “The Canvas Air Conditioner”) has step-bystep directions for making one. Most recently, John Stone, who has completely gutted and restored his Cape Dory 36, Far Reach, detailed his approach to canvas awnings for sailboats at sea and at anchor.

VENTILATE

Fans and a Windscoop hatch vent were lifesavers for us in the tropics. Frye recently explored the science of bringing air below (see PS September 2020, “Simple Tips to Improve Boat Ventilation”), and compared the effectiveness, of cowls, vents, and dorade boxes. We’ve also tested the ATN Dorcap, one of a few hatch vent designs that you can leave up in the rain (see PS May 2015, “Gear Fit for Summer Sailing”).

AIR CONDITIONING

Marina hoppers can take advantage of climate control aboard. We recently covered AC selection and installation (see PS June 2018, “Air Conditioning for Sailboats”). We’ve also researched the possibility of using compact units sparingly while at anchor with little, if any, reliance on a generator (see PS June 2019, “Air Conditioning at Anchor”).

MOVING

Of course, you could simply do what liveaboard sailors have been doing for generations. When the lower latitudes become too hot, make your way to cooler climates—maybe Seattle, or Portland, Oregon, or . . . Norway?

Where ever you go, don’t leave your shoes out on the dock, just in case.

If you have found another effective method or product that helps you to stay cool on your boat, feel free to share it in the comments below, or send me an email at [email protected].

Darrell Nicholson
Practical Sailor has been independently testing and reporting on sailboats and sailing gear for more than 50 years. Supported entirely by subscribers, Practical Sailor accepts no advertising. Its independent tests are carried out by experienced sailors and marine industry professionals dedicated to providing objective evaluation and reporting about boats, gear, and the skills required to cross oceans. Practical Sailor is edited by Darrell Nicholson, a long-time liveaboard sailor and trans-Pacific cruiser who has been director of Belvoir Media Group's marine division since 2005. He holds a U.S. Coast Guard 100-ton Master license, has logged tens of thousands of miles in three oceans, and has skippered everything from pilot boats to day charter cats. His weekly blog Inside Practical Sailor offers an inside look at current research and gear tests at Practical Sailor, while his award-winning column,"Rhumb Lines," tracks boating trends and reflects upon the sailing life. He sails a Sparkman & Stephens-designed Yankee 30 out of St. Petersburg, Florida. You can reach him at darrellnicholson.com.