The districts of Faro and Beja will be under a yellow warning until 3pm today and again on Friday between 3am and 9pm.
The yellow rain warning for the districts of Lisbon and Setúbal will be in effect between 12pm and 6pm today and in Santarém from 3pm to 9pm today.
The yellow warning, the least serious on a scale of three, is issued whenever there is a risk situation for certain activities depending on the meteorological situation.
In a statement, the Institute says that from today until the end of Sunday morning, showers are expected, sometimes heavy and accompanied by thunderstorms, with occasional hail, particularly in the central and southern regions, predicting a more significant impact in Baixo Alentejo, Algarve, Setúbal, Lisbon and Santarém, where extreme wind phenomena may occur.
The forecast indicates precipitation values of around 10 and 20 millimeters in one hour in the central and southern regions, with precipitation persisting.
The minimum temperatures today on the continent will vary between 01 degrees (in Guarda) and 11 (in Aveiro and Faro) and the maximum between 07 degrees (in Guarda) and 18 (in Aveiro and Faro).