Should you wear sunscreen even when it’s cloudy or drizzly in Singapore?

“While it may seem like the sun’s rays are blocked when the sky is overcast, both UVA and UVB rays can still penetrate through the cloud cover – sometimes up to 80% of them. The level of protection clouds offer depends on their type, density, and volume, but they generally filter only visible light, which is why the day appears dimmer. 

Ultraviolet rays, particularly UVA, have longer wavelengths and are more capable of passing through clouds. In some cases, clouds can even refract or scatter UV rays, potentially increasing your exposure in unpredictable ways.

UVA and UVB rays both cause damage to the skin, albeit in different ways. UVA rays penetrate deeper into the dermal layers, where they break down collagen and elastin. Over time, this contributes to premature ageing, fine lines, wrinkles, and an increased risk of skin cancer. UVB rays, while more superficial in their reach, are the main cause of sunburn and also play a role in ageing and cancer formation. Even when the sun isn’t visible, UVB rays can still reach your skin and cause sunburn, especially during prolonged exposure outdoors.

This is why sunscreen remains a non-negotiable part of your skincare routine, no matter the weather. On humid or rainy days, a lightweight, water-resistant sunscreen is ideal. It won’t feel heavy on the skin, and it will stay effective even with moisture in the air. You should apply it just as you would on a sunny day and remember to reapply every couple of hours, particularly if you’re outside or exposed to water or sweat. The bottom line: consistent use of sunscreen is one of the simplest yet most effective ways to safeguard your skin every day.”

Shinji Yamasaki is the CEO and Co-Founder of RE:ERTH