September 2025 brought cooler and drier conditions to Belgium compared to historical averages. The month presented a mixed weather pattern with notable temperature swings and below-normal precipitation levels across the country.
Temperature Overview
The average temperature for September 2025 reached 15.2 degrees Celsius, falling 1.1 degrees below the normal value of 16.3 degrees. This cooler-than-average month featured significant temperature extremes. The warmest reading was recorded in Evergem on September 7th, reaching 31.2 degrees Celsius, demonstrating that early September still delivered summer-like warmth in certain locations. In stark contrast, the coldest temperature of the month occurred in Doische on September 28th, dropping to just 4.0 degrees Celsius, marking a dramatic shift toward autumn conditions as the month progressed.
Precipitation Patterns
Rainfall during September was notably below normal, with an average total of 57.6 millimeters compared to the climatological normal of 77.3 millimeters. This represents a 25 percent deficit in precipitation. The wettest single day occurred in Maaseik on September 9th, when 47.7 millimeters fell, accounting for a substantial portion of the month's total rainfall. The Attert region emerged as the wettest location overall, accumulating 201.5 millimeters throughout the month, indicating that precipitation was unevenly distributed across Belgium.
Sunshine Duration
Sunshine hours totaled 261.3 hours for the month, slightly below the normal value of 268.8 hours, representing a three percent deficit. This modest reduction in sunshine was consistent with the overall cooler and somewhat cloudier conditions experienced during September.
Overall, September 2025 was characterized by below-average temperatures and reduced rainfall, creating conditions typical of a transitional autumn month with considerable day-to-day variability.