Brussels
Belgium
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
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
The first month of the autumn, September, is still a comfortable month in Brussels, Belgium, with temperature in the range of an average high of 19°C (66.2°F) and an average low of 10.9°C (51.6°F).

Temperature

In Brussels, Belgium, 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, in September, is 10.9°C (51.6°F).

Humidity

The average relative humidity in Brussels is 80.9%.

Rainfall

In Brussels, in September, it is raining for 15.7 days, with typically 68.9mm (2.7") of accumulated precipitation. Throughout the year, there are 199.6 rainfall days, and 852.8mm (33.6") of precipitation is accumulated.

Snowfall

Throughout the year, in Brussels, there are 23.7 snowfall days.

Daylight

In Brussels, the average length of the day is 12.6h.

Sunshine

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

UV index

The average daily maximum UV index in Brussels is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

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?

The average relative humidity in September is 80.9%.

How many days does it rain in September in Brussels?

In Brussels, during September, the rain falls for 15.7 days and regularly aggregates up to 68.9mm (2.7") of precipitation.

What is the average length of the day in September in Brussels?

In September, the average length of the day in Brussels is 12.6h.

How long on average sun shines in September in Brussels?

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

What is the UV index reading in September in Brussels?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.
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).
Coldest months (with the lowest average low temperature) are January and February (0.7°C).

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%).

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 lowest rainfall) is April (51.3mm).

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 lowest number of rainy days is July (14.3 days).

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).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Brussels, Belgium
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.4h).
The month with shortest days is December (Average daylight: 8h).

  • Average sunshine in September: 4.8h

The month with most sunshine is July (Average sunshine: 6.5h).
The month with least sunshine is December (Average sunshine: 1.5h).

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).
Months with the lowest UV index are January, February, November and December (UV index 1).