Warnings are accompanied by information on strong ultraviolet radiation when the ultraviolet index (UVI) is at least 6. This reading is reached in Southern and Central Finland a couple of times a summer, both before and after Midsummer.
Yellow colour used in UV advisory in warnings map.
UV index values vary in Finland over a wide range, depending on the season.
Besides information bulletins, the Finnish Meteorological Institute maintains a UVI service that gives advice on when and where people should protect themselves against the sun. UV index values vary in Finland over a wide range, depending on the season.
In addition, Finnish UVI observations are available from the Institute's measurement stations in Utö, Helsinki, Jokioinen, Jyväskylä, Sotkamo and Sodankylä.