With the summer solstice approaching, ultraviolet radiation is peaking in southern parts of the country.
The sun’s rays are currently particularly strong, causing the FMI to issue a UV index warning of six - which is considered "high" - on Friday. On a clear summer day in Finland, the UV index generally ranges between five and six.
Yle' meteorologist, Joonas Koskela, said sunscreen should always be applied when the UV index is above three, particularly between 10am and 5pm.
The FMI’s warning covers southern Finland as well as the Åland Islands between 11.39am and 2.39pm on Friday. The weather office also said it expects to issue UV warnings for parts of Finland on Saturday.
"While dense clouds can block UV radiation, thin and wispy ones don’t stop ultraviolet rays from reaching the earth’s surface," Koskela explained.
Dermatologists have recommended residents shield themselves with clothes and sunblock with a minimum sun protection factor of 50 during peak sunlight hours.
