According to the Portuguese Institute of the Sea and Atmosphere (IPMA), Santarém and Beja will be the regions where this "return" of summer temperatures will be felt most on Tuesday, with temperatures reaching 31°C.

There will also be highs of 29 and 30 degrees in Lisbon, Setúbal and Évora tomorrow.

While the sky will be clear or partly cloudy in these regions, the Algarve will have clear skies across the region with highs of 26 degrees in Sagres and 27 degrees in Faro.