September in Brussels typically marks a transition from summer to autumn. Expect average high temperatures around 18-20C (64-68F), gradually decreasing throughout the month. Average lows hover around 10-12C (50-54F). Rainfall is common, with an average of around 70mm spread across the month, so packing accordingly is advisable. Sunshine hours decrease to an average of around 5 hours per day.
Understanding the typical climatic conditions of Brussels during September is crucial for travelers planning a visit. Packing appropriate clothing, including layers for fluctuating temperatures and rain gear, is essential for comfort and enjoyment. The shift in weather also influences local events and activities, with outdoor events potentially impacted by rain. Awareness of the seasonal transition allows visitors to make informed decisions regarding their itinerary and chosen activities, maximizing their experience in the Belgian capital.