As temperatures rise across Dorset, it’s natural to head to the coast, rivers, and lakes to cool off. But even in hot weather, open water can be dangerous. Understanding the risks and taking simple precautions can save lives.

Cold water can still be deadly

It may feel warm outside, but UK waters remain cold—even in summer. Water below 15°C can trigger cold water shock, a sudden reaction that affects breathing and movement. [rnli.org]

When you enter cold water unexpectedly, your body can gasp involuntarily, your breathing becomes rapid and uncontrolled, and your heart rate increases. These reactions can overwhelm even strong swimmers and significantly increase the risk of drowning. [nfcc.org.uk]

What to do if you fall in:

  • Don’t panic – the initial shock passes in about a minute
  • Float on your back to regain control (“Float to Live”)
  • Call for help or swim to safety if you can [rnli.org]

Many people don’t plan to enter the water

More than half of accidental drownings involve people who never intended to go in. Slips, trips, and falls near water—especially on cliffs, harbours, and riverbanks—are common causes. [nfcc.org.uk]

Take care when walking near the water’s edge, avoid distractions, and keep a safe distance, particularly in unfamiliar areas.

If you see someone in trouble, remember:
Phone, Float, Throw – call emergency services, throw something that floats, and don’t enter the water yourself. [nfcc.org.uk]

Open water carries health risks too

Swimming in natural water like the sea, rivers, or lakes can expose you to bacteria and pollution not found in swimming pools. This can lead to illnesses such as stomach bugs, skin infections, or more serious conditions in rare cases. [gov.uk]

You can reduce your risk by:

  • Checking local water quality and pollution forecasts
  • Avoiding swimming after heavy rainfall
  • Not swallowing water
  • Washing hands after swimming and covering any cuts [gov.uk]

Simple steps for safer swimming

  • Choose lifeguarded beaches where possible
  • Check tides, weather, and local advice before entering the water
  • Avoid alcohol near water—it increases risk and impairs judgement [nfcc.org.uk]
  • Consider wearing a wetsuit or buoyancy aid for added protection [rnli.org]

Enjoy Dorset’s coast safely

Dorset’s coastline and waterways are a huge part of what makes the area special—but they demand respect. Even during a heatwave, the risks remain real.

By understanding cold water shock, staying alert around water, and following safety advice, you can enjoy the sunshine while keeping yourself and others safe.