cloudydays

Sunscreen On Cloudy Days

DO I NEED TO WEAR SUNSCREEN ON A CLOUDY DAY?


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  • - SARAH ZHOU
  • - M.D.C.M CANDIDATE
  • - MCGILL UNIVERSITY

THE SHORT ANSWER IS YES,

The sun shines brightly every day, and despite cloud cover, UV radiation still penetrates to the earth. The Skin Cancer Foundation reports that on average, cloud cover only blocks 20% of the sun’s rays. In particular, UVA rays have a longer wavelength than UVB rays, allowing them to more easily pass through clouds. UVA rays might not give you a sunburn, but they are the rays that penetrate deeply in the skin to cause aging and skin cancer.While it might feel cooler on a cloudy day, it is still important to maintain your usual protective behaviours with a high SPF sunscreen or sun protective clothing! Finally, weather can change on a dime and once the clouds clear you may find yourself in intense sunlight with no or minimal sun protection.

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  1. Julian, A. (May 2020). UVA on a cloudy day. Retrieved June 2020, from View Source
  2. Richard, E. (June 2019). All About Sunscreen. Retrieved June 2020, from View Source