Belgium weather in September 2025

Expect 20°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Belgium in September. Check more long-term weather averages for Belgium in September before you book your next holiday to Belgium in 2025/2026.

  • 20°C maximum daytime temperature in September in Belgium (Brussels)20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in September in Belgium (Brussels)16
    16 days with some rainfall
  • 11°C minimum night-time temperature in September in Belgium (Brussels)11
    11°C min night temperature
  • 13 hours of daylight per day in September in Belgium (Brussels)13
    13 hours of daylight per day
  • No heat & humidity in September in Belgium (Brussels)0
    No heat & humidity
  • 60 mm monthly rainfall in September in Belgium (Brussels)60
    60 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Belgium (Brussels)4
    4 (Moderate) UV index

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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.

Top Belgium destinations

Below are average maximum temperatures at popular countries, regions and places in Belgium in September. Select a holiday destination to see more weather parameters.

All Belgium destinations

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

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More about Belgium

How hot is it in Belgium in September?

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

How sunny is it in Belgium in September?

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

Does it rain in Belgium in September?

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

Belgium September sunrise & sunset times

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

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

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