The districts of Portalegre, Castelo Branco, Beja, Santarém, Faro and Évora have been under yellow warning since 12:00 and until midnight due to rain.
These six districts are again under the same level between 3pm and midnight on Tuesday.
The IPMA also issued a yellow warning due to rain for the districts of Bragança, Viseu, Guarda, Vila Real Setúbal, Lisbon, Leiria, Aveiro and Coimbra from 3pm on Tuesday and until 3am on Wednesday.