The UV Index provides a daily forecast of the expected risk of overexposure to the sun. The Index predicts UV intensity levels on a scale of 0 to 10+, where 0 indicates a minimal risk of overexposure and 10+ means a very high risk. Forecasting the intensity of UV at ground level takes into account information on the time of day, date, latitude, amount of cloud, altitude, presence of haze and ozone concentrations.

The UV index values with the relevant exposure categories are:
3 - 4 - Low - Wearing a hat and a sunscreen with SPF 15 is recommended.
5 - 6 - Moderate - Wearing a hat, a sunscreen with SPF 15 and staying in the shade is advised.
7 - 9 - High - In addition to the precautions recommended above, it is advised to stay indoors between 10 a.m. and 4 p.m.
10+ - Very High - In addition to the precautions recommended above, it is advised to stay indoors between 07:00 and 17:00, if possible.