September Weather in Brussels, Canada

Last updated: June 18, 2025

In September, the average temperature in Brussels, Canada hovers around 16°C (61°F). Expect a wide range in temperatures, with a minimum of -1°C (30°F) and a maximum reaching up to 31°C (88°F). Be prepared for some rain, as the area receives an average precipitation of 98 mm (3.9 in) over 12 days. Additionally, the average humidity remains high at 81%, creating a typically moist atmosphere.

September Temperature in Brussels

In September, in Brussels, the average temperature is a pleasant 16°C (61°F), with maximums reaching up to 31°C (88°F) and minimums dipping as low as -1°C (30°F). This weather makes Brussels an ideal destination for those seeking a diverse climate experience during their travels.

September Weather in Brussels: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Brussels, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brussels, September typically has an average temperature of 16°C (61°F), with highs reaching up to 31°C (88°F) and lows dropping to around -1°C (30°F).

Data source: Temperature data for Brussels generated using information from the Copernicus Climate Change Service.

September Precipitation in Brussels

In Brussels in September, the precipitation amount is 98 mm (3.9 in) over the course of 12 days.

September Precipitation Trends in Brussels

The chart displays monthly precipitation patterns in Brussels, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Brussels, September typically receives around 98 mm (3.9 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Brussels

In Brussels in September, humidity is 81%. With an average temperature of 16°C (61°F), this humidity feels like a warm, heavy blanket wrapping around you as you explore the sights, making it essential to stay hydrated and take regular breaks in the shade.

September Average Humidity in Brussels

This chart illustrates the average monthly humidity levels in Brussels, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Brussels is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brussels

In Brussels in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Brussels.

Maximum UV Index Levels in Brussels for September

The chart shows the monthly maximum UV Index (UVI) for Brussels in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Brussels typically reaches 7, which falls under the high exposure category.

Data source: Brussels September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Brussels Compares to Other Months

Weather in Brussels varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brussels, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Brussels, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	77 mm (3.0 inches)	90%	low
February Weather	-5°C (24°F)	87 mm (3.4 inches)	90%	moderate
March Weather	0°C (32°F)	74 mm (2.9 inches)	87%	moderate
April Weather	5°C (42°F)	105 mm (4.1 inches)	87%	very high
May Weather	13°C (55°F)	102 mm (4.0 inches)	82%	very high
June Weather	18°C (65°F)	98 mm (3.9 inches)	81%	very high
July Weather	21°C (70°F)	86 mm (3.4 inches)	79%	very high
August Weather	20°C (68°F)	126 mm (4.9 inches)	80%	very high
September Weather	16°C (61°F)	98 mm (3.9 inches)	81%	high
October Weather	10°C (50°F)	123 mm (4.8 inches)	84%	moderate
November Weather	2°C (36°F)	103 mm (4.1 inches)	88%	moderate
December Weather	-2°C (30°F)	83 mm (3.3 inches)	87%	low