“You do not need sunscreen when it is cloudy.”
Clouds do not block all ultraviolet rays. UVA rays in particular pass through a large part of the cloud cover and through many types of glass.
Author: Uzm. Dr. Oya Oylum Argun
WRONG
Clouds do not block all ultraviolet rays. UVA rays in particular pass through a large part of the cloud cover and through many types of glass.
The two types of ray act differently: UVB is mostly responsible for sunburn, while UVA is responsible for photoageing and spots. The strength of UVA does not change as sharply as UVB across the seasons and the hours of the day.
So sunscreen is not a habit just for sunny days or summer months. It is protection that lasts all year.
This article is for general information and does not replace individual medical advice. The right approach for you is decided at the consultation.
Last updated: 4 September 2026
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