Yellow heat warning still in force on Friday across the country.
It will be largely dry across Belgium, and temperatures will be reaching 21°C to 29°C.
The Royal Meteorological Institute (RMI) said there is still a chance of a few showers, mainly in the west and over higher ground.
The day will begin with patches of low cloud or fog in some areas before giving way to a mix of sunny spells and cloud.
A few localised showers may develop later, particularly north of the Sambre-Meuse valley.
Winds will initially be light and variable, or from the south-west, before turning light to moderate from the west or north-west during the day.
Along the coast, moderate northerly winds are expected.
Highs will range from 21°C or 22°C on the coast to 29°C in the Campine and Belgian Lorraine.
Yellow heat warning in force until the night of 4 to 5 August.
From Sunday, temperatures are expected to rise again, bringing another spell of hotter weather.
