What is the weather like in Brussels vs Rotterdam in September?

In September, Brussels averages 21°C high / 12°C low with about 63 mm of rain; Rotterdam averages 21°C high / 11°C low with about 91 mm.

Brussels vs Rotterdam in September

Brussels is the better pick in September — 86 vs 82 on SeasonMap's comfort score. Brussels is nice, a little rain, clean air, while Rotterdam is nice, rainy, clean air.

Brussels vs Rotterdam — September climate, side by side

	🇧🇪 Brussels	🇳🇱 Rotterdam
Comfort score	86/100 (A)	82/100 (A)
Feels-like high	20°C	20°C
Avg high / low	21° / 12°	21° / 11°
Rainfall	63 mm	91 mm
Rainy days	11	10
Humidity	76%	78%
Air quality (AQI)	45	50

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Brussels vs Rotterdam in September — FAQ

Is September better in Brussels or Rotterdam?: Brussels is the better pick in September — 86 vs 82 on SeasonMap's comfort score. Brussels is nice, a little rain, clean air, while Rotterdam is nice, rainy, clean air.
What is the weather like in Brussels vs Rotterdam in September?: In September, Brussels averages 21°C high / 12°C low with about 63 mm of rain; Rotterdam averages 21°C high / 11°C low with about 91 mm.