Brussels Weather in September

September weather

Brussels feels mild in September, with afternoons around 21°C and cooler evenings near 11°C. Rain falls on 12 days, so showers can interrupt a day out, but they rarely rule out sightseeing. The Grand-Place, the Magritte Museum and the covered Royal Saint-Hubert Galleries all work well between showers.

You'll still have enough daylight for a walk through Parc du Cinquantenaire or along the Canal. Skip a full day outdoors if steady rain is forecast; the cobbled streets around the old centre get slippery.

Events and crowds

September brings the Belgian Beer Weekend, usually held around the Grand-Place, and the Brussels Heritage Days. The latter open historic buildings that are normally closed to visitors, though dates and access vary by year.

The city is still popular, but the summer holiday rush has eased. You'll generally find fewer families than in August and a calmer feel than during the Christmas markets. Prices often fall from summer highs, though event weekends can be busier.

A useful local tip

For the Heritage Days, check which buildings are open before crossing town. Some sites are spread across Brussels, and the metro makes it easier to link areas than walking between them. At the Grand-Place beer event, try a Belgian beer style you haven't tasted before, and take your time: the square can feel crowded.

Couples who like city walks will find September comfortable, but should keep an indoor stop in mind for rainy spells. The Comic Strip Route, with murals across central Brussels, is an easy alternative when the weather clears.