Brussels weather

Our guide to the weather in Brussels during September

20

Average high

4

UV Index

58mm

Monthly rainfall

77%

Humidity

Brussels is a vibrant city full of culture and history; September is a great time to visit as the weather is usually mild. We've looked at the most up-to-date weather data for Brussels, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Brussels weather in September.

What's the temperature like in Brussels during September?

The temperature reaches around 20℃ during the daytime in September, falling away to 12℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it rain in Brussels during September?

On average, there will be 4 rainy days during the month, amounting to 58.0mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Brussels during September?

You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate air temperatures, any breeze will feel cool.

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Weather in Brussels

Our month-by-month guide to the weather and climate in Brussels

5.2

Brussels weather in

January
6.7

Brussels weather in

February
10.7

Brussels weather in

March
14.8

Brussels weather in

April
17.5

Brussels weather in

May
21.2

Brussels weather in

June
23.2

Brussels weather in

July
23.4

Brussels weather in

August
20.0

Brussels weather in

September
15.2

Brussels weather in

October
10.1

Brussels weather in

November
6.4

Brussels weather in

December