The IPMA had previously placed the districts of Guarda and Viseu under a yellow warning, between 12pm and 6pm today.
In a new statement, IPMA has also placed the districts of Bragança, Porto, Vila Real, Viana do Castelo and Braga under yellow warning until 6pm today.
Minimum temperatures will range between 6 degrees Celsius (in Bragança) and 14 (in Aveiro) and maximum temperatures between 14 (in Guarda) and 21 (in Braga and Santarém).