The notice will be in effect between 12:00 and 18:00 today and between 00:00 and 15:00 on Wednesday.
The IPMA also issued a yellow warning for the districts of Guarda and Castelo Branco due to snowfall above 700/800 meters between 00:00 and 09:00 on Wednesday.
The IPMA predicts for today on the continent periods of very cloudy skies, showers in the southern region, and the possibility of snowfall in the far north.
The forecast also points to the formation of frost, especially in the interior regions, and a small decrease in the maximum temperature.
The minimum temperatures will fluctuate between -3 degrees (in Guarda) and 7 (in Faro and Aveiro) and the maximum between 8 (in Guarda) and 17 (in Braga and Setúbal).