Reality: According to the SCF, up to 80 percent of the sun's UV rays can pass through clouds. This is the reason people often end up with serious sunburns on overcast days if they've spent time outside with no sun protection.

Do you tan better with clouds?

It does not matter how cloudy, hazy, or even rainy the day is there is still a chance of getting a tan, and even worse, a burn. Thick grey or black clouds will absorb some of the rays and not allow as much UV light through, but some will still get through and into your skin.

Is the sun more powerful through clouds?

Many people have heard the claim that UV Rays are stronger on cloudy days, but often this thought is disregarded entirely as a myth. ... Clouds can block up to 70-90% of these UV-B rays during times of extreme overcast.