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Weather Talk
Home›Weather Talk›Can You Get a Sunburn Under Water?

Can You Get a Sunburn Under Water?

By Andrea Aker
August 17, 2012
17403
4

Excerpt from Valley 101: A Slightly Skewed Guide to Living in Arizona, a collection of Clay Thompson’s columns for The Arizona Republic. (Originally published August 17, 2001.)

Q: We are recent transplants to Arizona from Washington, where it rains a lot, so we never had to worry about this before: Can you get sunburned under the water?

A: I will answer that in a moment, but first I need to remind you that as new Arizonans and pool owners, it is your duty to sit by the pool on Thanksgiving Day and call relatives in colder climates and say, “Hey, guess what we’re doing?”

Anyway, the answer is yes. Even if various parts of your body parts are submerged, they are still susceptible to sunburn.

As you no doubt know, it is the ultraviolet rays in sunshine that cause sunburn. Clouds or fog or water block out some of those rays, but still up to 70 or 80 percent beam through.

One source I found said ultraviolet rays can penetrate clear water to a depth of 25 centimeters, and of course 25 centimeters is the same as 9.85 miles.Wait, that can’t be right. Inches, it’s the same as 9.85 inches.

There is also the question of reflection. If you’re bobbing in the pool with sunscreen smeared all over your bald spot, you can still end up sunburned because some of the ultraviolet rays are bouncing off the water and smacking you in the face.

There are a number of precautions you might take. First, you could keep rotting vegetation in your pool to cloud the water. This would be yucky, but it would keep harmful rays from penetrating as deeply as they would in clear water.

Or you could swim fully clothed, including a hat and gloves. This might be better than the rotting vegetation idea.

Or, and this might be best, you could coat yourself with the best, water-resistant sunscreen you can find. Get one with an SPF of 15 or higher and make sure the label says it protects from both UVA and UVB, which are the two bands of ultraviolet light that burn us.

And don’t forget about that Thanksgiving thing. Mark it on your calendar now.

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4 comments

  1. SaraD 21 August, 2013 at 08:12 Reply

    We had neighbors who moved away and left their pool full of rotting vegetation. Now I know why.

  2. Dr.peterson 15 June, 2017 at 12:34 Reply

    It is absolutely impossible to get sunburnt and or tan underwater. Although UV-b rays penetrate through the water it can’t come in contact to your skin due to the chlorine/ outside motor effect. That states with all amounts of water pressure pushing through at nearly 8 tons per second the sun would be nowhere near able to tan or burn your skin the slightest. It would have to be 11 mm to give you a slightest burn. Now however you may say how is that possible when you get tan and have been in the water all day. That is simply because when your body is exposed the sun is attracted to skin another effect called Brewster effect. I am a doctor with my dr degree if u think this isn’t a reliable source go to your local pool or clinic.

  3. Robin 7 August, 2019 at 22:08 Reply

    Do fish get sunburnt?

    • Halfway 15 August, 2020 at 14:04 Reply

      No, unlike humans, they have reflective scales.

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