Your holiday weather, at a glance

Belgium in September: where is it warmest?

In September, Ypres is the warmest place with 20 °C by day, Bastogne the coolest with 17 °C. 19 of 22 destinations have good holiday weather.

All destinations in September, warmest first

Long-term averages for the month: daytime high, sea, sunshine and rainy days.

Place	Score	Air	Sea	Sun	Rain days
Ypres	76	20°	–	5 h	9
Tournai	75	20°	–	5 h	10
Ghent	74	20°	–	5 h	10
Brussels	74	20°	–	5 h	10
Leuven	74	20°	–	5 h	10
Mons	74	20°	–	5 h	10
Mechelen	74	20°	–	5 h	10
Hasselt	74	20°	–	5 h	10
Antwerp	72	20°	–	5 h	11
Bruges	76	19°	–	6 h	10
Liège	73	19°	–	5 h	11
Namur	73	19°	–	5 h	11
De Haan	73	19°	–	6 h	11
Waterloo	73	19°	–	5 h	11
Dinant	72	19°	–	5 h	11
Zeebrugge	23	19°	18°	6 h	10
Knokke-Heist	23	19°	18°	6 h	10
Ostend	21	19°	18°	6 h	11
Spa	69	18°	–	5 h	12
Eupen	69	18°	–	5 h	12
Malmedy	69	18°	–	5 h	12
Bastogne	72	17°	–	5 h	11

Belgium in September: where is it warmest?

The warmest places in September are Ypres (20 °C), Tournai (20 °C) and Ghent (20 °C).

Belgium in September: where is the sea warmest?

The sea is warmest at Zeebrugge (18 °C), Knokke-Heist (18 °C) and Ostend (18 °C).

Belgium in September: where is the weather best?

The best holiday weather in September – warm, sunny and dry – is in Ypres, Bruges and Tournai.

Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences