The UV Index explained
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Educational information only. Not medical advice and no dosing information. Melanotan I and II sold online are not FDA-approved. Talk to a licensed doctor.
Weather apps show a daily UV Index. It's a quick way to know how strong the sun's UV rays will be and how much protection you need.
What the numbers mean
The EPA: UV Index scale groups the index into five levels:
| UV Index | Level | What to do |
|---|---|---|
| 0-2 | Low | Minimal protection needed for most people; wear sunglasses on bright days, and use sunscreen if you burn easily. |
| 3-5 | Moderate | Seek shade near midday, cover up, use sunscreen. |
| 6-7 | High | Protection needed; reduce time in the sun between late morning and mid-afternoon. |
| 8-10 | Very high | Extra precautions; skin can burn quickly. |
| 11+ | Extreme | Take all precautions; avoid midday sun if you can. |
See the EPA page for the official guidance at each level.
Things that raise UV exposure
- Time of day: UV is strongest around midday.
- Season and latitude: higher in summer and closer to the equator.
- Altitude: UV increases as you go higher.
- Reflection from water, sand and snow.
- Clouds don't block all UV; you can burn on cloudy days.
The National Weather Service: UV safety page has more tips and links to UV forecasts.
How to use it
- Check the UV Index in the morning with the weather.
- Plan outdoor activities for earlier or later in the day when it's high.
- Use broad-spectrum sunscreen, clothing and shade.
Related: does a base tan protect you? ยท ABCDE mole check.
Published October 25, 2026. Sources are linked in the text. See our Medical Disclaimer.