The Great Misconception: Why We Skip Sunscreen
On an overcast or rainy day, you can't feel the sun's heat, which our brains often link with the danger of getting a sunburn. [3, 14] This sensory trick leads to a false sense of security. [21] Many people believe that the thick cloud cover acts as a natural
shield, blocking the sun’s harmful ultraviolet (UV) rays. [17] The cool, humid weather of the Indian monsoon can also make applying an extra layer of cream feel sticky and uncomfortable. It’s an understandable habit, but one based on a critical misunderstanding of how UV radiation works, a mistake that dermatologists warn can lead to significant skin damage over time. [17, 20]
The Invisible Threat: UVA vs. UVB Rays
The sun emits different types of ultraviolet radiation, primarily UVA and UVB, and they affect our skin differently. An easy way to remember them is that UVB rays lead to Burning, while UVA rays are responsible for Ageing. [4] UVB rays, which are a primary cause of sunburn, are partially blocked by clouds. [4] UVA rays, however, have a longer wavelength and can penetrate clouds, glass, and deeper into your skin layers with ease. [1, 4, 11] UVA rays are present all day, every day of the year, regardless of the weather. [8] They contribute to premature ageing, wrinkles, and the breakdown of collagen. [8, 17] Both UVA and UVB rays damage skin cell DNA and are linked to an increased risk of skin cancer. [11]
The Science of Cloud Cover
Contrary to popular belief, clouds are not an effective sun shield. Studies show that up to 80% of the sun's UV rays can pass through light cloud cover. [2, 17] In fact, under certain conditions, a phenomenon known as the “broken-cloud effect” can actually enhance UV radiation levels. [2] This happens when UV rays reflect off the sides of clouds, potentially increasing the intensity of radiation reaching the ground by up to 25% more than on a clear, sunny day. [3, 9] While very thick, heavy storm clouds do block more UV radiation, they never eliminate it entirely. [1] A significant portion of damaging UVA rays always gets through. [1]
A Guide for the Indian Monsoon
The humid, sticky weather of the monsoon season presents a unique challenge. Cream-based sunscreens can feel heavy and greasy. For those with oily or acne-prone skin, dermatologists recommend opting for a lightweight, gel-based, non-comedogenic sunscreen that won't clog pores. [10, 15] If you have normal or dry skin, a lightweight lotion can provide necessary hydration without feeling oily. [15] Most importantly, choose a water-resistant formula. Rain and sweat can wash off your protection, so a water-resistant sunscreen is crucial to ensure it remains effective. [5, 15] Reapplication is key—aim for every two to three hours, especially if you get caught in a downpour or are sweating. [16, 19]
Your Year-Round Sunscreen Strategy
Making sunscreen a non-negotiable part of your daily routine is the goal. For daily use in seasons like the monsoon, dermatologists advise using a broad-spectrum product with an SPF of at least 30, which blocks about 97% of UVB rays. [5, 19] If you plan on being outdoors for longer periods, an SPF 50 is recommended. [10, 20] Ensure the label says “broad-spectrum,” which confirms it protects against both UVA and UVB rays. [5, 17] Also look for a PA rating of +++ or higher, which specifically measures UVA protection. [16] Apply it generously about 15-20 minutes before you head out to allow it to absorb properly. [20] Don't forget often-missed spots like your ears, neck, and the tops of your feet. [15]
