Ingredient science · 5 min read
Do You Need Sunscreen in Winter? What Changes in India
UVB drops in winter, but UVA barely does. When you can relax about sunscreen in India, when you can't, and what to switch to as the weather turns dry.
Short answer: yes for most people, most days. The longer answer is more useful, because there are a few days when you honestly can relax.
Two kinds of UV, two different winters
UVB is the type that burns. It depends heavily on the angle of the sun, so it drops in winter, especially in north India. UVA is the type linked to ageing and pigmentation, and it changes much less through the year. It also passes through clouds and through window glass. So the reason you don't feel burnt in December doesn't mean your skin isn't taking UV.
Use the UV index, not the temperature
Cold doesn't mean low UV. The World Health Organization advises sun protection when the UV index is 3 or above. Your phone's weather app shows it. In much of India the midday index is still at or above 3 on clear winter days, and it's higher the further south you go, or at altitude. On thick fog days in the north, when you're out for only a few minutes, you can be more relaxed. On a clear winter afternoon in Jaipur or Hyderabad, you can't.
Who should be most consistent
- Anyone with pigmentation: melasma, dark marks after acne, or tan that won't fade. Sun exposure, including UVA, keeps those going, and no brightening serum works if you skip sunscreen.
- Anyone using retinoids or exfoliating acids, because these make skin more sun-sensitive.
- Anyone outdoors at midday: school runs, commutes by bike, lunch outside, winter weddings, cricket, terrace time.
- Anyone heading to the hills. UV rises with altitude, and fresh snow reflects up to about 80% of it, per WHO.
Indoors
If you sit next to a window most of the day, UVA still reaches you. A normal morning application is enough; you don't need to reapply every two hours for a desk day.
Changing the formula for dry weather
A matte gel that suits July can feel drying in December. Move to a cream or lotion sunscreen, or a tinted one if you like it. Check the label for SPF 30 or higher and PA+++ or higher. Use about two finger-lengths for face and neck. The cold doesn't change how much you need.
Skip the idea that makeup with SPF is enough: nobody applies foundation thickly enough to get the labelled protection. And if you've heard about India's new sunscreen testing standard, we explain what it means for the SPF number on your pack.
Quick answers
Is sunscreen needed on a foggy or cloudy day?
UVA passes through cloud. Fog cuts UV more than thin cloud does, but if you'll be outside for hours, put it on.
Can I skip sunscreen if I'm at home all day?
Mostly yes, unless you sit by a bright window for long periods or have pigmentation you're trying to treat.
Does SPF 50 give twice the protection of SPF 25?
No. SPF 30 blocks about 97% of UVB and SPF 50 about 98%. Daily, generous application matters more than the number.