UV Index

Environment Canada’s UV Index is a measure of the intensity of the sun’s burning UV rays. The higher the number, the stronger the sun’s rays. The scale runs from 1-11 in Canada but may reach 14 or higher in the southern United States and the tropics.

The daily UV Index forecast is a prediction of the maximum UV strength for the day. This peak is usually reached in the early afternoon. UV Index forecasts are widely available between April and September. Your sources include local TV and radio stations and the Environment Canada web site.