The yellow warning for the districts of Viseu, Porto, Vila Real, Viana do Castelo, Aveiro, Coimbra and Braga will be in effect between 9 am and 3 pm on 26 August, according to the Portuguese Institute of the Sea and the Atmosphere (IPMA).

The yellow level is the least severe on a scale of three and is issued whenever there is a risk situation for certain activities dependent on the weather situation.

IPMA forecasts for 25 August in mainland Portugal: light showers until the end of the afternoon, especially in the North and Central regions; light to moderate west/southwest wind; a slight rise in maximum temperature in the North and Centre; and a slight decrease in minimum temperature, a situation that will remain on Wednesday.

Minimum temperatures on 25 August will range between 13 degrees Celsius (Guarda) and 19 degrees Celsius (Aveiro), and maximum temperatures between 20 degrees Celsius (Guarda) and 28 degrees Celsius (Beja).