Throughout the weekend, mainland Portugal and the Madeira archipelago are at very high risk of exposure to UV radiation.
In the Azores archipelago on Saturday, São Miguel will have high levels, Faial and Terceira will have high levels and Flores will have moderate levels.
On Sunday, the Azores archipelago is at very high risk, with the exception of Flores which is at high risk.
Temperatures are expected to rise for most of mainland Portugal today and over the next few days.
The ultraviolet radiation scale has five levels, from extreme to low risk.
For regions at extreme risk, IPMA recommends avoiding sun exposure as much as possible.
In regions with very high risk, the IPMA recommends the use of sunglasses with UV filters, a hat, a t-shirt, an umbrella, sunscreen and avoiding exposing children to the sun.
The IPMA recommends the use of sunglasses with UV filters, a hat, a t-shirt and sunscreen for high-risk regions.
The Institute predicts partly cloudy skies, light winds and a slight increase in maximum temperatures in the North and Central regions for today and the weekend on the continent.
Minimum temperatures will range between 09 degrees Celsius (in Bragança) and 16 (in Faro and Setúbal) and maximum temperatures between 22 (in Aveiro) and 31 (in Beja).
In the Madeira archipelago, the forecast points to periods of cloudy skies, light showers on the northern slope and in the highlands today and Saturday and light to moderate winds.
In Funchal, temperatures will vary between 19 and 25 and in Porto Santo between 18 and 23.
The IPMA forecasts for the Azores archipelago today and over the weekend generally cloudy skies, periods of light rain or drizzle and generally light winds.
In the Azores, temperatures will range between 16 and 25 degrees.