Can I get a sunburn on a cloudy day? Yes, though the clouds block some light, more than 90% of the sun's UV rays pass through clouds and cause sunburns, Cancer Research UK said. How can I protect ...

Mid-day and early afternoon hours are when the sun is at its highest, therefore its most dangerous, and according to EPA, the sun’s rays are the strongest between 10 a.m. and 4 p.m.