Do we need sunscreen when it is cloudy? When it is sunny outside, we tend to be good at slathering on the sunscreen, but did you know that up to 40 percent of the sun’s ultraviolet radiation reaches the earth on a completely cloudy day? Using sunscreen everyday protects us from harmful radiation from the sun and reduces our risk for skin cancer, premature aging and sunburns. Today, there are many organic sunscreen options available. Your local health store can help you find one with organic ingredients, that is well-rated by the Environmental Working Group and that provides broad spectrum protection.