Weather Report: Waals-Brabant, Belgium – September 2025
September 2025 brought notably cooler and significantly drier conditions to Waals-Brabant compared to historical averages. The month was characterized by a temperature deficit and substantially reduced rainfall, creating a notably dry period across the province.
Temperature Overview
The average temperature for September reached 15.3 degrees Celsius, falling 1.0 degree below the normal value of 16.3 degrees. This represents a modest cooling trend for the month. The warmest day occurred on September 7 in Braine-l'Alleud, where temperatures climbed to 30.3 degrees Celsius, providing a brief warm spell early in the month. In contrast, the coldest conditions were recorded on September 28 in Genappe, where temperatures dropped to just 5.6 degrees Celsius, marking a sharp decline as autumn progressed.
Precipitation Patterns
September proved exceptionally dry, with average total precipitation reaching only 28.3 millimeters—a striking 57 percent below the normal value of 65.4 millimeters. This substantial deficit indicates drought-like conditions throughout much of the month. The wettest day occurred on September 13 in Rebecq, which received 15.7 millimeters of rainfall. When considering total precipitation by location, Braine-l'Alleud recorded the highest accumulation with 41.0 millimeters for the entire month, though this remains well below seasonal norms.
Sunshine and Notable Conditions
Sunshine hours totaled 258.0 hours across the province, representing a minor 3 percent decrease from the normal 266.8 hours. Despite the dry conditions, cloud cover remained relatively limited. The month's weather pattern showed a transition from warmer early September conditions to progressively cooler temperatures by month's end, with the significant temperature range between the warmest and coldest days illustrating the seasonal shift into autumn.