Skip to content
Voykit

When to go · Brussels

Brussels in September

Good month. Mild; good walking.

Key facts

Verdict
Good
Temperature
19°C (66°F) / 11°C (52°F)
average high / low
Rain days
13
Crowds
Medium
Belgium overall
Prices
Medium
Belgium overall

Verdict

GoodVoykit month rating for Brussels

Mild; good walking.

All twelve months in one grid — weather, crowds and prices, with gaps left as unknown.

Is another month better than September?

September is rated good. These months rate higher:

Weather in September

Long-term averages
  • BrusselsHighs around 19 °C (66 °F), lows around 11 °C (52 °F), rain on about 13 days
  • Flanders, Brussels and the coast, Belgium · Bruges, Ghent, Antwerp, Brussels, Ostendfine

    Mild, cloudy and damp; summers around 22–25 °C (72–77 °F) with occasional heatwaves. December Christmas markets offset dark afternoons.

Autumn season

The Comic Strip Festival and crisp walking weather before the grey sets in.

Watch: Rain days climb back up through November.

Festivals and holidays

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

  • Brussels Comic Strip Festival check

    Weekend in September · Centre, near the Comic Strip Center

    Comic-themed events, giant inflatable characters and stalls around the centre.

Crowds and prices

Crowds · Belgium overall
Medium
Prices · Belgium overall
Medium

Belgium overall: Mild, calmer; Heritage Days open private buildings in Brussels and Flanders.

Compare two months

Weather, crowds and prices for any two months in Brussels, side by side.

  • Verdict

    Sep: Good

    May: Great (better)

  • Daytime high

    Sep: 19 °C (66 °F)

    May: 18 °C (64 °F)

  • Night low

    Sep: 11 °C (52 °F)

    May: 9 °C (48 °F)

  • Rain days

    Sep: 13

    May: 13

  • Crowds

    Sep: Medium

    May: Medium

  • Prices

    Sep: Medium

    May: Medium

  • Festivals listed

    Sep: 1

    May: 2

September: Mild; good walking.

May: Mild and green; good month.

Brussels: figures are long-term averages from this guide, not a forecast.

What to pack

  • A warm layer for the evenings
  • A rain jacket or umbrella and shoes that dry fast

Build the full packing list for your trip →

Across Belgium in September →