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Watermael-Boitsfort Weather in September
Watermael-Boitsfort, Brussels, Belgium
About Watermael-Boitsfort in September
Watermael-Boitsfort borders the 4,400-hectare Sonian Forest, which profoundly shapes its microclimate — summer temperatures run 4–6°C below the city centre, and the forest generates cool katabatic air flows on calm evenings. The neighbourhood's garden-city layout with abundant mature trees amplifies this cooling effect, making it Brussels' coolest inhabited commune.
For detailed monthly temperature and rainfall data for Brussels in September, see the Brussels September weather guide.