Belgium in September offers a transitional period between summer and autumn. Typically, days are mild with average temperatures ranging from 13C to 19C (55F to 66F). While sunshine is still prevalent, periods of rain become more frequent and evenings noticeably cooler. This shift brings a change in foliage, with early hints of autumn colors starting to appear in certain regions, particularly the Ardennes.
This time of year presents an ideal opportunity for visitors seeking a less crowded experience. The pleasant weather allows for comfortable exploration of cities like Brussels, Bruges, and Ghent, without the peak summer heat. Outdoor activities such as hiking and cycling remain enjoyable, and the harvest season brings local markets brimming with fresh produce. Historically, September has marked the beginning of the academic year and the return to a more regular rhythm of life after the summer holidays, influencing cultural events and activities across the country.