Does cloud cover block UV rays?
Quick Answer: Clouds do block some UV rays, but not all. Even on cloudy days, significant UV radiation reaches the ground, so protection is still needed.
Clouds can reduce UV radiation by scattering and absorbing some of the rays. However, thinner or broken clouds let through a surprising amount of UV light. This means you can still get sunburned under cloudy skies.
Also, certain types of UV rays, like UVA, penetrate clouds more easily than UVB. So, wearing sunscreen or protective clothing remains important regardless of cloud cover.