London vs Brussels

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, London edges ahead as the better destination in September. London offers 8 hours of daily sunshine with only 9 rain days, while Brussels sees 8 sunshine hours and 11 rain days.

London sits in the comfortable travel range at 19°C. Brussels is also comfortable at 19°C.

For travelers who prioritize dry weather, London is the stronger choice in September.

London reaches an average high of 19°C (66°F) and drops to 11°C (52°F) at night during September. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Brussels averages 19°C (66°F) for the high and 12°C (54°F) for the low, with a daily range of 7°C. The two cities feel quite similar in terms of temperature.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in September.

London receives approximately 48 mm of rainfall across 9 rain days during September. You can expect rain roughly every other day.

Brussels sees 55 mm over 11 rain days. That makes London the drier option by 2 rain days and 7 mm of total precipitation.

Both cities share similar humidity levels at 65%.