The five districts of the continent will be under a yellow warning due to the persistence of minimum temperatures until 11:00 am today.
The IPMA forecasts that today will have mainly clear skies with some cloud mainly in the Baixo Alentejo and the Algarve where there will be a chance of rain this afternoon.
A small drop in the minimum temperature is also expected on the North and Central coasts.
The minimum temperatures will fluctuate between -2 degrees Celsius in Guarda and 11 in Faro and the maximum between 7 in Guarda and 16 in Faro, Beja, Setúbal, Santarém and Leiria.