The meteorologist David Denehauw reports on Twitter that the Belgium has set a new record of temperature during the heat wave this early in the month of August. Between 6 and 12 August, the average temperature was 33.5 degrees, is within your station of Uccle.

The record prior to date of 1976, for almost the same period : between 30 July and 6 August, the average synoptic was 33.4 degrees.