Contents
Weather in September
Temperature
With the beginning of September, the average high-temperature in Brussels shows a small decrease, transitioning from an agreeable 22.6°C (72.7°F) in August to an enjoyable 19°C (66.2°F). Nighttime temperature in Brussels lowers to an average of 10.9°C (51.6°F) in September.Humidity
In Brussels, the average relative humidity in September is 80.9%.Rainfall
In September, the rain falls for 15.7 days. Throughout September, 69mm (2.72") of precipitation is accumulated. Throughout the year, in Brussels, Belgium, there are 199.6 rainfall days, and 853mm (33.58") of precipitation is accumulated.Snowfall
In Brussels, snow does not fall in May through October.Daylight
The average length of the day in September in Brussels, Belgium, is 12h and 38min.On the first day of the month, sunrise is at 06:57 and sunset at 20:27. On the last day of September, in Brussels, sunrise is at 07:42 and sunset at 19:22 CEST.
Sunshine
In Brussels, the average sunshine in September is 4.8h.UV index
In September, the average daily maximum UV index in Brussels is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Guard yourself - Avoiding sunburn is suggested. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Frequently asked questions
What is the usual temperature for Brussels in September?
What is the average humidity in September in Brussels?
How many days does it rain in September in Brussels?
When it does not snow in Brussels?
How many hours of daylight does Brussels have in September?
What time are sunrise and sunset in September in Brussels?
How many hours of sunshine does Brussels have in September?
How high is the UV index in September in Brussels?
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).
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 least 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 least 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).
The months with the least 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: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in September: 4h and 5min
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).
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).
Brussels, Belgium
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