Weather Report: Vlaams-Brabant, Belgium – September 2025
September 2025 brought notably cooler and drier conditions to Vlaams-Brabant compared to historical averages. The month presented a mixed weather pattern with early warmth giving way to increasingly cool conditions as autumn progressed, while precipitation remained significantly below normal levels throughout the period.
Temperature Overview
The average temperature for September in Vlaams-Brabant reached 15.7 degrees Celsius, falling 1.0 degree below the normal value of 16.7 degrees. This cooler-than-average month featured a notable temperature range. The warmest day occurred on September 7 in Ternat, where temperatures climbed to 30.4 degrees Celsius, providing a brief summer-like interlude early in the month. In stark contrast, the coldest conditions arrived late in the month, with Haacht recording a minimum of 5.8 degrees Celsius on September 28, marking the transition into autumn's chill.
Precipitation Patterns
Rainfall was substantially below normal, with the province receiving an average total of 35.1 millimeters compared to the normal 63.9 millimeters—representing a 45 percent deficit. The wettest day of the month occurred on September 9 in Geetbets, which recorded 23.0 millimeters of precipitation. However, the location receiving the most rainfall throughout the entire month was Herne, accumulating 51.4 millimeters. The dry conditions dominated most of the period, creating a notably drier-than-average September across the region.
Sunshine and Notable Observations
Sunshine hours totaled 258.9 hours, slightly below the normal 266.6 hours, representing a modest 3 percent deficit. This near-normal sunshine despite cooler temperatures suggests relatively clear skies during much of the month. The combination of below-average temperatures, significantly reduced precipitation, and near-normal sunshine hours created conditions characteristic of a dry autumn transition, with early September warmth giving way to increasingly cool and crisp conditions by month's end.