September weather forecastBrussels, Belgium
September
Weather in September
September introduces the beautiful season of fall, with a distinguishable ease in the summer warmth, as days cool down to an average high of 19°C (66.2°F). The cityscape becomes a canvas painted in the hues of autumn, even as the rainfall frequency persists per the summertime. The days gradually grow shorter, with diminished daylight and sunshine hours. The cooling temperatures bring a change of attire, with light layers and jackets becoming necessary additions. It is also noticeable that the relative humidity begins to rise again.Temperature
With the onset of September, Brussels experiences a modest temperature adjustment, with the average high-temperature gently receding from an agreeable 22.6°C (72.7°F) in August to a refreshing 19°C (66.2°F). The average temperature during September nights dips to a cool 10.9°C (51.6°F).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, 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
In Brussels, the average length of the day in September 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, sunrise is at 07:42 and sunset at 19:22 CEST.
Sunshine
In Brussels, Belgium, the average sunshine in September is 4.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 4 suggests these recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 36min
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 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).
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).
