Its Time to Start Preparing for Winter Swimming


written by Simon Griffiths, Founder and Publisher of Outdoor Swimmer magazine.  Article first appeared in Outdoor Swimmer magazine. 

The water in my stretch of the Thames has been above 20 degrees Centigrade for weeks on end. I follow several outdoor swimming venues on Twitter, and they’ve consistently reported similar high temperatures. This has brought new people to the water and encouraged others who habitually wear wetsuits to try swimming without.

It’s midsummer in the northern hemisphere now and we still (hopefully) have a good few weeks of warm water, but if you are thinking about swimming outdoors this winter, now is the time to start preparing, especially if you’re not going to wear a wetsuit.

cold water swimming

From now on, inland water temperatures are likely to start dropping. Sea temperatures are typically slightly warmer in September than August but will also start falling as the days shorten.

While it’s possible to start winter swimming during the coldest months, it’s more comfortable, and more fun, to acclimatise gradually as water temperatures drop. This also helps you learn how your body copes with water over a wide range of temperatures.

Here are our tips for preparing for a winter of non-wetsuit swimming.

  1. If you don’t already, start keeping a log of the water temperature, how long you stay in, and how you felt during and after the swim.
  2. Keep swimming regularly. The more frequently you swim, the easier it becomes, but you need to balance swimming with the rest of your life. If you can only manage once per week, then so be it, but try not to miss a week.
  3. As the water cools, you will need to shorten the time you spend in the water. Don’t take risks with hypothermia. You still get the health benefits from short dips.
  4. If you want to continue with longer training swims in autumn, then consider wearing a wetsuit for these, and perhaps taking it off at the end for a few minutes of acclimatisation.
  5. Feel free to experiment with neoprene accessories such as boots and gloves to protect your extremities but don’t use them to allow yourself to stay in the water longer.
  6. Wear a bobble hat and swim head-up breaststroke if you don’t want to put your face in the water.
  7. Small changes in water temperature can make a big difference to how quickly you cool down, so always take extra care and keep your swims short when you swim at a new personal low temperature.
  8. Cold water shock typically starts affecting people at about 15 degrees, and the impact increases at cooler temperatures. If you’ve acclimatised and got comfortable getting into water at, say, 12 degrees, the cold water response will still be triggered if you get into colder water. Therefore, always enter cold water carefully.
  9. Expect it to be uncomfortable – painful even – getting into cold water, especially below 10 degrees. It’s part of the challenge but you will adjust and feel better after a minute or two.

neoprene swim cap and bobble hat

Swimming outdoors in winter is very different to doing it in the summer. You will spend a lot more time preparing and re-warming than you will in the water. It’s hard to do enough swimming for fitness or training purposes. Instead, the benefits are social and for your wellbeing. Anecdotally, it boosts your mood and reduces stress, and it may help people with certain mental health conditions – and there are plausible scientific reasons why plunging into cold water delivers these benefits.

However, it comes with significant risks. Stay safe by staying well within your limits, swimming with other people and learning about cold water shock, swim failure, hypothermia and afterdrop.

For more cold water training tips, check out Outdoor Swimmer magazine's  cold water section on their website.

Simon Griffiths

Take a look at our Cold Water Swimming Essentials to help you continue swimming into the cooler months.

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