UV index & sun exposure
The UV index is an internationally used scale, running from 0 upward, that tells you how strong the sun's UV rays are at a given place and time. The higher the number, the more protection your skin tends to need.
Why it matters
Checking the UV index takes seconds and gives you a quick read on how much care your skin needs that day, which helps you protect it without overthinking it.
The one thing
Glance at the UV index in your weather app before heading out, and step up your sun protection as the number climbs.
The UV index is a simple scale that tells you how intense the sun's ultraviolet rays are right now, wherever you are. It starts at 0 and climbs from there. The basic rule of thumb is easy: the higher the index, the less time you'll want to spend in direct sun, and the more protection your skin tends to need.
A few things push the number up or down through the day, including how high the sun is, the time of year, your altitude, and how close you are to the equator. Cloud cover can lower it, though clouds don't block UV completely, so a grey day isn't automatically a low-UV one.
Reading the scale
The index groups UV strength into broad bands, and each one comes with a general suggestion:
- 0 to 2 (low): Protection usually isn't essential for short spells outdoors.
- 3 to 5 (moderate): A good point to wear sunscreen, seek some shade midday, and reach for sunglasses or a hat.
- 6 to 7 (high): Same precautions, with sunscreen around SPF 30 a sensible call.
- 8 to 10 (very high): Higher protection helps here, roughly SPF 30 to 50, with reapplication through the day.
- 11 and above (extreme): Sun protection of SPF 50 or higher, plus shade and cover-up.
Treat these as a guide rather than strict rules. Your own skin, how long you're out, and what you're doing all factor in.
Where to find it
You don't need anything special. Most weather apps show the UV index, usually a swipe or scroll away on the daily forecast, so it's right there in your pocket whenever you want to check.
Going deeper
Related
SPF, short for Sun Protection Factor, is a number that tells you how much longer a sunscreen helps protect your skin from burning. Using it well comes down to picking a broad-spectrum formula, applying enough, and topping it up through the day.
UV filters are the active ingredients in sunscreen that protect your skin from UV light. They come in two broad families, mineral and chemical, which shield the skin in slightly different ways.
A skincare routine is the small set of steps you do regularly to clean, hydrate, and protect your skin. A solid beginner routine is short: cleanse, moisturise, and wear sunscreen.