UVA and UVB rays hit their peak between 10 am and 4 pm. UVA rays are present whenever it’s light outside, even in the morning or late afternoon, during the winter or on cloudy days. So a sunscreen is always required.
Protection offered by higher SPFs is minimal – – SPF 15 screens 93% of the sun’s UVB rays, SPF 30 protects 97% and SPF 50 protects against 98%. Seeing a broad spectrum on the bottle of a sunscreen is more important as it provides protection against both UVA and UVB rays.