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What Is the UV Index? Sun Safety Number Explained
In brief
The UV Index is a scale that estimates ultraviolet radiation strength at the surface. Meteorological services publish daily UV forecasts; higher values mean faster sunburn risk for unprotected skin.
The UV Index is a scale that estimates ultraviolet radiation strength at the surface. Meteorological services publish daily UV forecasts; higher values mean faster sunburn risk for unprotected skin.
What do the numbers mean?
Many scales run roughly 0–11+, with higher values needing more protection.
Does cloud remove UV?
Clouds can reduce but not eliminate UV.
Is this medical advice?
No — general sun-safety literacy.
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Last updated: 12 Oct 2026. Re-check linked official sources before citing figures.
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People also ask
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Kids tip?
Use shade, clothing and official sunscreen guidance.
Sources
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