What Does a UV Index of 8 Mean?
A UV index of 8 is very high. Plan extra protection and reduce time in direct sun around the midday peak. The reading tells you the sun is strong, even if the air feels cool.
Where 8 sits on the scale
The standard bands run from low at 0 to 2 through moderate, high, very high and extreme. Eight begins the very high band, which continues through 10. The next band starts at 11 and has no upper limit.
You do not need to wait for an extreme label to change your plans. At 8, use the forecast to find a less exposed time for a walk, game or beach visit. Keep a shaded or indoor option for the strongest part of the day.
What to do when the forecast reaches 8
- Move exposed activities. Compare the morning and later afternoon curve before choosing a start time.
- Cover up. Pack a shirt that covers your shoulders, a broad-brimmed hat and UV-blocking sunglasses.
- Use sunscreen on uncovered skin. Choose broad-spectrum SPF 30+ and follow its application and reapplication instructions.
- Plan shade breaks. Choose shelter before you need it, especially on open beaches, paths and sports grounds.
Sunscreen works alongside the other measures. It is easy to miss ears, the back of the neck or the tops of feet, so clothing can make your plan simpler. See what to wear for sun protection.
How quickly can you burn at UV 8?
Unprotected skin can be damaged quickly at very high UV, but there is no dependable burn time for every person. A minute estimate would need to know your sensitivity and the exposure reaching your skin. It could also encourage you to stay out until the timer ends.
Use the category as a prompt to protect yourself at the start. Do not use an absence of redness as evidence that you have more time.
The daily peak is not the whole day
If today's maximum is 8, the morning and evening may be much lower. On UV by Hour, the main curve and hour-by-hour table show when those changes happen. All times are local to the selected place.
Compare the forecast for Phoenix with Sydney if you are travelling. The protection meaning of 8 stays the same; the season and hours around the peak do not.
Common questions
Is UV 8 the same as hot weather?
No. UV and air temperature measure different things. A breeze can make an exposed afternoon comfortable without removing the need for protection.
Can UV reach 8 through clouds?
Yes. Do not dismiss a very high forecast because the sky looks grey. See how clouds affect UV.
When is it lower?
Check the descending side of today's curve. There is no single afternoon hour that works everywhere. Our guide to the drop below 3 explains what to look for.
Sources and further reading
Check today’s UV for your place
This guide is general information about sun safety and isn’t medical advice. Talk to a doctor or dermatologist about your own skin.