UV Index Guide
Enter today's UV index to get its risk level plus an estimate of how long until your skin type burns
Understand the five WHO risk categories of the UV Index (0 to 11+) and estimate how long you can stay in the sun before burning, based on your skin type and the SPF of the sunscreen you're wearing.
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How to use
- Enter your local UV Index (0 to 11+) or set it with the slider.
- Pick your skin type (fair, medium, dark, and so on) and the SPF rating of the sunscreen you have on.
- Read the risk level for that UV exposure along with the estimated safe time in direct sun before skin damage starts.
FAQ
- What does the SPF number on sunscreen actually mean?
- SPF (Sun Protection Factor) mainly measures protection against UVB rays. SPF 30, for example, cuts the UVB reaching your skin to about 1/30 of what it would be with no sunscreen — which in theory means it takes 30 times longer for your skin to start burning.
- Is the UV index higher at higher altitudes?
- Yes — with less atmosphere to scatter and absorb sunlight, UV intensity tends to rise about 10-12% for every 1,000m of elevation gain. Reflective surfaces like snow, sand, or water also bounce extra UV back at you, so your actual exposure can be higher than the raw index suggests even at the same reading.
- Is the UV index higher at higher altitudes?
- Yes — with less atmosphere to scatter and absorb sunlight, UV intensity tends to rise about 10-12% for every 1,000m of elevation gain. Reflective surfaces like snow, sand, or water also bounce extra UV back at you, so your actual exposure can be higher than the raw index suggests even at the same reading.