You should always wear sunscreen, even on cloudy days. If you assume it's OK to forgo protection on an overcast day, think again. Sunscreen is an important preventive health care habit that should be maintained all year. The reason why is that sunscreen protects your skin from UV Rays, as a result it lowers your skin cancer risk, prevents premature aging of the skin and helps maintain an even skin tone. Therefore, please remember to wear sunscreen on cloudy days.