Brussels weather in September 2025

Expect daytime maximum temperatures of 20°C in Brussels, Belgium in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 16 days with some rainfall and typically 60 mm of rainfall in the month.

  • 20°C maximum daytime temperature in September in Brussels20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in September in Brussels16
    16 days with some rainfall
  • 11°C minimum night-time temperature in September in Brussels11
    11°C min night temperature
  • 13 hours of daylight per day in September in Brussels13
    13 hours of daylight per day
  • No heat & humidity in September in Brussels0
    No heat & humidity
  • 60 mm monthly rainfall in September in Brussels60
    60 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Brussels4
    4 (Moderate) UV index

More about Brussels

Brussels by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Belgium

TUI: up to 8% off holidays booked online

  • Book online with TUI & save up to 8% on holidays
  • FREE child places available for select holidays
  • Pay £0 deposits with direct debit & spread the cost
Go to TUI deal >>

View all TUI offers

TUITUI deal finder

The September weather guide for Belgium (Brussels) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

Back to top

More about Belgium

How hot is it in Brussels in September?

Daytime temperatures usually reach 20°C in Brussels in September, falling to 11°C at night.

How sunny is it in Brussels in September?

There are normally 6 hours of bright sunshine each day in Brussels in September - that's 44% of daylight hours.

Does it rain in Brussels in September?

There are usually 16 days with some rain in Brussels in September and the average monthly rainfall is 60mm.

Brussels September sunrise & sunset times

Browse the sunrise and sunset times for Brussels in September 2025. Select a month to view Brussels sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:56 19:28
Monday, 15th September 2025 06:18 18:56
Tuesday, 30th September 2025 06:42 18:22

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^