Following Sunday morning's sunny skies and scattered clouds, the cloud cover is expected to spread to all regions as the day progresses, according to the Royal Meteorological Institute.
However, the weather will remain generally dry, with maximum temperatures ranging from 19°C at sea and in Hautes Fagnes to 23°C in Belgian Lorraine.
The skies will clear up once again in the evening. Night-time lows will vary between 6°C in Hautes Fagnes, 11°C in the centre and 15°C at sea, while the wind will be light.
The skies will be sunny once again on Monday morning in most regions. The clouds will move in during the afternoon, but the weather will remain dry in many areas.
Highs will range from 19°C in the Upper Ardennes to 23°C in lower and central Belgium.
