The yellow warning for these four districts will be in force between 09:00 and 15:00 today.
The IPMA has also placed the districts of Porto, Viana do Castelo, Leiria, Aveiro, Coimbra and Braga under a yellow warning due to sea unrest, with northwesterly waves measuring four to 4.5 meters expected.
These six districts will be under yellow warning between 12:00 and 24:00 today.