September weather forecast
Brussels, Belgium

A beautiful slope garden with several museums, in the city of Brussels, Belgium
A beautiful slope garden with several museums, in the city of Brussels, Belgium

Weather in September

September, the first month of the autumn in Brussels, is still a comfortable month, with an average temperature varying between 10.9°C (51.6°F) and 19°C (66.2°F).

Temperature

In September, the average high-temperature marginally drops from an agreeable 22.6°C (72.7°F) in August to a comfortable 19°C (66.2°F). The average low-temperature, is 10.9°C (51.6°F).

Humidity

In September, the average relative humidity in Brussels is 80.9%.

Rainfall

In Brussels, during 15.7 rainfall days, 69mm (2.72") of precipitation is typically accumulated. In Brussels, Belgium, during the entire year, the rain falls for 199.6 days and collects up to 853mm (33.58") of precipitation.

Snowfall

In Brussels, snow does not fall in May through October.

Daylight

In Brussels, the average length of the day in September is 12h and 38min.
On the first day of September, sunrise is at 06:56 and sunset at 20:28. On the last day of the month, sunrise is at 07:41 and sunset at 19:23 CEST.

Sunshine

In September, the average sunshine is 4.8h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Brussels?

In Brussels, Belgium, in September, the average high-temperature is 19°C (66.2°F), and the average low-temperature is 10.9°C (51.6°F).

What is the average humidity in September in Brussels?

In September, the average relative humidity is 80.9%.

How many days does it rain in September in Brussels?

In Brussels, in September, during 15.7 rainfall days, 69mm (2.72") of precipitation is typically accumulated.

When it does not snow in Brussels?

May through October are months without snowfall.

How many hours of daylight does Brussels have in September?

In September, the average day length in Brussels is 12h and 38min.

When is the sunrise / sunset in September in Brussels?

In September, on the first day of the month, sunrise is at 06:56 and sunset at 20:28. On the last day of the month, in Brussels, Belgium, sunrise is at 07:41 and sunset at 19:23 CEST.

How many hours of sunshine does Brussels have in September?

In Brussels, the average sunshine duration in September is 4.8h.

How high is the UV index in September in Brussels?

In September, the average daily maximum UV index in Brussels is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average UV index

Average temperature in September
Brussels, Belgium

Average temperature in September - Brussels, Belgium
  • Average high temperature in September: 19°C

The warmest month (with the highest average high temperature) is July (23°C).
The month with the lowest average high temperature is January (5.7°C).

  • Average low temperature in September: 10.9°C

The month with the highest average low temperature is July (14°C).
The coldest months (with the lowest average low temperature) are January and February (0.7°C).

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Average humidity in September
Brussels, Belgium

Average humidity in September - Brussels, Belgium
  • Average humidity in September: 80.9%

The month with the highest relative humidity is December (88.8%).
The month with the lowest relative humidity is April (72.5%).

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Average rainfall in September
Brussels, Belgium

Average rainfall in September - Brussels, Belgium
  • Average rainfall in September: 68.9mm

The wettest month (with the highest rainfall) is December (81mm).
The driest month (with the least rainfall) is April (51.3mm).

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Average rainfall days in September
Brussels, Belgium

Average rainfall days in September - Brussels, Belgium
  • Average rainfall days in September: 15.7 days

The month with the highest number of rainy days is December (19.3 days).
The month with the least rainy days is July (14.3 days).

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Average snowfall days in September
Brussels, Belgium

Average snowfall days in September - Brussels, Belgium
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Brussels, Belgium

Average daylight in September / Average sunshine in September - Brussels, Belgium
  • Average daylight in September: 12h and 38min

The month with the longest days is June (Average daylight: 16h and 26min).
The month with the shortest days is December (Average daylight: 8h and 2min).

  • Average sunshine in September: 4h and 48min

The month with the most sunshine is July (Average sunshine: 6h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 30min).

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Average UV index in September
Brussels, Belgium

Average UV index in September - Brussels, Belgium
  • Average UV index in September: 4

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 1).

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