The UV Index

The UV Index is a scale ranging from 1 to 11+. It describes the level of solar UV radiation at the Earth's surface at any given time and is an indicator of the potential for associated health risks.

UV Index and Sun Protection

The UV Index levels, corresponding risk of harm, and advised protection are as follows;

-The advised protections given are for adults with pale to lightly tan skin. Children and particularly fair-skinned people or those who have sun sensitivity for medical reasons need to take extra precautions.

The level of Sun protection you need will depend on the UV Index level for the time of day and location you will be exposed to the Sun. As UV strength varies throughout the day, and from place to place, it is useful to use our UV index forecast to determine what type of Sun protection you will need, and when. For each hour of the day our forecasts tell you the UV Index level and what protection you need.

Origins of the UV Index

The UV Index, as used on, was developed by the World Health Organisation (WHO) in collaboration with the United Nations Environment Programme (UNEP), the World Meteorological Organisation (WMO), the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the German Federal Office for Radiation Protection (Bundesamt fur Strahlenschutz).