UV index 9: how long until skin burns?
UV index 9 falls in WHO's Very high category. Without protection, very fair skin (type I) can start to redden in about 10 minutes, and olive skin (type IV) in about 35 minutes. These are rough estimates, not safe times.
Very high · 8–10 Extra protection: avoid midday sun; shade, shirt, hat, sunscreen are essential.
A warning, not a safe time. Redness shows up hours later.
Minutes to first redness by skin type
| Type IAlways burns, never tans; very pale skin, often freckles or red hair | about 10 minutes |
|---|---|
| Type IIUsually burns, tans with difficulty; fair skin, often light eyes | about 15 minutes |
| Type IIISometimes burns, tans gradually; light to light olive skin | about 20 minutes |
| Type IVRarely burns, tans easily; olive or light brown skin | about 35 minutes |
| Type VVery rarely burns, tans darkly; naturally brown skin | about 45 minutes |
| Type VIAlmost never burns; naturally dark brown to black skin | about 75 minutes |
What WHO advises at this level
WHO calls for extra protection. Avoid being outside during the midday hours where you can, and make sure you have shade when you are. A shirt, a broad-brimmed hat and sunscreen are a must, together with sunglasses. Unprotected fair skin can start to redden in about 10 to 15 minutes, and reflected UV can harm your eyes.
When and where you see this level
UV 9 is a typical clear-sky peak in June and July along the southern Mediterranean, for example in southern Spain, southern Greece, Cyprus and Turkey's south coast. Mountain areas reach it in summer, even in central Europe.
What this means if you want a tan
UV 9 can redden unprotected fair skin in about 10 minutes and olive skin in about half an hour. There is no sensible way to tan at this level. If you are outside, use shade, clothing, a hat, sunglasses and sunscreen together.
Frequently asked questions
How long does it take to burn at UV 9?
Rough estimates for unprotected skin at UV 9: type I: about 10 minutes; type II: about 15 minutes; type III: about 20 minutes; type IV: about 35 minutes. Redness usually appears hours later, and some people burn sooner. These are not safe times.
Is UV 9 high?
Very high (8–10). WHO calls for extra protection. Avoid being outside during the midday hours where you can, and make sure you have shade when you are. A shirt, a broad-brimmed hat and sunscreen are a must, together with sunglasses. Unprotected fair skin can start to redden in about 10 to 15 minutes, and reflected UV can harm your eyes.
Can you tan at UV 9?
UV 9 can redden unprotected fair skin in about 10 minutes and olive skin in about half an hour. There is no sensible way to tan at this level. If you are outside, use shade, clothing, a hat, sunglasses and sunscreen together.
Sources
- WHO, WMO, UNEP, ICNIRP (2002): Global Solar UV Index – A Practical Guide
- WHO (2022): Radiation – The ultraviolet (UV) index, questions and answers
- ICNIRP with ILO and WHO (2007): Protecting Workers from Ultraviolet Radiation (skin types and SED, Table 1)
- Journal of Cosmetic Dermatology: Fitzpatrick skin phototypes with typical minimal erythema dose (Table 1, after Fitzpatrick 1988 and Pathak 1987)
- CIE: Standard Erythema Dose, a Review (1 SED = 100 J/m²)