Not every stretch of open water is crystal clear. Murky lakes, choppy sea after wind, or brown, peaty water are all part of open-water swimming, especially away from postcard bays. Swimming in poor visibility means taking a different approach than in clear water. Here are the key points so you stay safe and confident even when you can't see much.
Why poor visibility is more than an optical problem
In murky water, one of your most important orientation aids disappears: the view ahead and downward. You see neither the bottom nor other swimmers in time, which triggers an unconscious sense of unease in many people. That feeling often leads to shallower breathing, more tension, and a more restless stroke, all factors that tire you out faster. The first step is therefore mental: accept that you'll see less, and rely more on your other senses and on your technique.
Sighting becomes even more important
In poor visibility, you can't orient yourself using the bottom or underwater markers. That makes sighting above the water surface all the more important. Before you start, pick fixed, tall reference points on land, a tree, a building, a mast, that stay visible even when buoys are hard to make out in murky water. Sight a little more often than usual, but keep it short and efficient so you don't drift off course.
The right goggles make the difference
In murky water and changing light, the tint of your goggles is crucial. Clear or lightly tinted lenses provide more contrast under cloudy skies and dark water than heavily mirrored lenses, which are designed more for bright sunshine. Also look for a wide field of view, so you take in more of your surroundings when sighting without having to lift your head fully. Anyone who regularly swims in varying conditions is often best served by two lens options, one for bright and one for dark days.
Visibility for others: not just a concern for you
If you can't see well yourself, boats, SUPs, and other swimmers see you less well too. That's exactly why a highly visible safety buoy in poor visibility isn't an optional extra, but a central safety factor. It makes you visible to other water users from a distance and doubles as buoyancy support if you need a break to reorient. Especially in murky water or hazy light, that's a noticeable safety gain.
Stay calm and trust your rhythm
When visibility is poor, your best anchor is your own rhythm. Count your strokes, focus on an even arm pull and calm breathing, instead of constantly peering ahead with tension. A reliable, well-practiced movement pattern gives you confidence, even when your surroundings offer few reference points. Anyone who has deliberately practiced this in training stays composed in a race, even in poor visibility.
Never alone in poor conditions
In genuinely poor visibility, the basic rule of open-water swimming applies even more: don't swim alone. A training partner or a group significantly increases safety, because if something goes wrong, someone is there to react. Stick to familiar, manageable routes too, rather than exploring new waters when visibility is poor.
Frequently asked questions about swimming in poor visibility
Which lens tint is best in murky water?
Clear or lightly tinted lenses usually provide more contrast under cloudy skies and dark water than heavily mirrored models.
How do I orient myself when I can't see the bottom?
Using fixed, tall reference points on land and more frequent, short sighting above the surface rather than orienting underwater.
Is a safety buoy more important in poor visibility?
Yes, because you're harder for other water users to see. A highly visible buoy increases your visibility and serves as buoyancy support.
Can I swim alone in poor visibility?
Better not. A partner or a group significantly increases safety, especially when conditions are hard to read.
Enjoy your swim.
