Can You Tan on a Cloudy Day? What UV Rays Really Do Behind the Clouds

You've probably heard someone say, "It's cloudy, I don't need sunscreen." It's one of the most common summer myths, and it leads to some of the most surprising sunburns. So can you actually tan on a cloudy day? The short answer is yes, and understanding why will change how you protect your skin.

Can you really tan when it's overcast?

You can. Tanning is caused by ultraviolet (UV) radiation, not by visible sunlight or heat. Clouds block a lot of the visible light that makes a day look bright, but they let a large share of UV rays pass straight through. On a lightly overcast day, up to 80% of the sun's UV rays can still reach your skin. That means your skin keeps producing melanin, the pigment behind a tan, even when the sky looks grey and the temperature feels mild.

Why cloudy days can actually be riskier

Here's the trap: because it doesn't feel hot and the light seems soft, people stay outside longer without reapplying protection, or skip it entirely. There's no bright glare to remind you to seek shade. The result is that many people get their worst sunburns on days that didn't feel sunny at all. Some cloud formations can even scatter and intensify UV in a phenomenon known as the "broken-cloud effect," pushing UV levels temporarily higher than they'd be under a clear sky.

What about UVA vs. UVB through clouds?

The sun delivers two types of UV that matter for skin. UVB is the main driver of sunburn and surface tanning, and it's partially filtered by heavy cloud cover. UVA, which penetrates deeper and is largely responsible for premature aging, wrinkles, and long-term damage, passes through clouds and even glass with very little resistance. So on an overcast day you might not burn as fast, but you're still soaking up the rays that quietly age your skin. That's why dermatologists recommend a broad-spectrum sunscreen that shields against both.

How to protect your skin on cloudy days

The rule is simple: if it's daytime, wear protection, regardless of what the sky is doing. A few practical habits go a long way:

• Check the UV index, not the cloud cover. Weather apps show a daily UV index. Anything 3 or higher warrants sun protection, cloudy or not.
• Wear broad-spectrum SPF every day. For your face, a daily shield like our SPF 50 Face guards the most delicate, aging-prone skin. For your body, our SPF 30 Body keeps you covered on long overcast days outdoors.
• Reapply every two hours. Clouds don't extend how long your sunscreen lasts. Reapplication still matters.

Can you still get a glow on a cloudy day?

You can, and you can do it thoughtfully. Because UV is gentler under heavy cloud, overcast days can be a lower-intensity way to build color gradually, as long as you don't overstay. If you're chasing a sun-kissed finish, our SPF 4 Tanning Oil conditions the skin and enhances a natural glow with a light layer of protection, ideal for a mellow, cloud-diffused afternoon. Want both protection and glow on hand? The Summer Duo pairs a body SPF with the tanning oil so you're ready for whatever the sky decides to do.

The bottom line

Clouds are not sunscreen. Up to 80% of UV rays get through, your skin keeps tanning, and the aging UVA rays barely notice the overcast at all. Treat every daylight hour as sun exposure, protect the skin that matters most, and you can enjoy a soft, even glow without paying for it later. A grey sky is never a reason to skip your SPF.