If you plan to visit Brussels in September, the weather is typically alright, with an average high temperature of +68°F during the day and approximately 5 sunny days. Expect some rainy, though, as there are typically 15 rainy days in the month and around 65 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+68°F
Avg. max. temperature
+37°F
Min.
+95°F
Max.
65 mm
Total precipitation
78%
Avg. humidity
3 m/s
Avg. wind
5 ☀️
Sunny Days
8 ⛅️
Cloudy
15 🌦
Rainy
Our opinion: Brussels has OK weather in September.
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Average temperature in Brussels in September
Here are the expected maximum, average and minimum temperatures in Brussels for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +90°F during the day to a minimum of +45°F during the night, the temperature in September averages around +75°F.
The average maximum temperature goes down 12% by the end of the month, compared with the beginning of the month, from +72°F to +66°F.
Is Brussels warm or cold in September?
Brussels is typically mild in September.
Maximum temperatures go down compared to the previous month from +73°F to +68°F. The minimum temperature also goes down from +57°F to +52°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Brussels:
Travel to Brussels
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✈️
51
Flights per week
$758
Min. Price
$758
Max. Price
Airlines with direct connections:
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Air France
Lufthansa
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Climate in Brussels in September
Brussels weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+73°F
+68°F
+59°F
Min. temperature
+43°F
+37°F
+25°F
Max. temperature
+97°F
+95°F
+79°F
Rainfall
67 mm
65 mm
65 mm
Wind
2 m/s
3 m/s
3 m/s
Humidity
73%
78%
82%
Air pressure
1015 HPa
1016 HPa
1014 HPa
Sunny days
5
5
4
Cloudy days
7
8
10
Rainy days
16
15
16
Snowy days
0
0
0
September typically has worse weather conditions compared to August.It’s getting colder in September. From +73°F in the day, the average maximum temperature lowers to +68°F.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 67 mm to 65 mm.Humidity rises from 73% to 78%.Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average.The amount of sunny days stay about the same, averaging 5 sunny days during the month.
October brings much the same weather, it remains ok.
Wind speed in Brussels in September based on historical data.
Last Year
Historical Data
The average wind speed is 2 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Brussels is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Brussels based on historical data.
Last Year
Historical Data
Typically, there is a 33% chance of rain on an average day in September, with total rainfall of approximately 89 mm. The maximum amount of rainfall per day is around 36 mm, which is moderate rain.September is a pretty wet month with over 10 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Brussels wettest month is June, where a typical day has a 50% chance of precipitation and 71 mm of rainfall per day. February, on the other hand, is the driest month with a mere 38% chance of precipitation and 49 mm of rainfall per day.
How was the weather last September in Brussels?
This is the weather in Brussels in September 2023:
1 September
🌧️
+72°F
2 September
☀️
+76°F
3 September
☀️
+76°F
4 September
☀️
+79°F
5 September
☀️
+86°F
6 September
☀️
+86°F
7 September
☀️
+85°F
8 September
☀️
+87°F
9 September
☀️
+87°F
10 September
☀️
+90°F
11 September
☀️
+81°F
12 September
☀️
+76°F
13 September
☀️
+70°F
14 September
☀️
+74°F
15 September
☀️
+76°F
16 September
☀️
+78°F
17 September
☀️
+74°F
18 September
☀️
+75°F
19 September
☀️
+68°F
20 September
☀️
+70°F
21 September
🌧️
+68°F
22 September
☀️
+63°F
23 September
☀️
+64°F
24 September
☀️
+69°F
25 September
☀️
+72°F
26 September
☀️
+72°F
27 September
☀️
+74°F
28 September
☀️
+69°F
29 September
☀️
+68°F
30 September
☀️
+67°F
In September 2023 Brussels had 28 sunny days, 0 cloudy days, and 2 rainy days. The average maximum temperature was +75°F, with an absolute maximum of +90°F and a minimum of +63°F. The average humidity was 81%, with a maximum of 100% and a minimum of 49%. The average wind speed was 2 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Brussels climate has changed over the last 43 years.
The climate in Brussels in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1985 (+55°F) and the highest in 2022 (+62°F). The driest year was 1996 with only 558 mm of rainfall, and the wettest year was 2022 with 1284 mm.
FAQ
Frequently asked questions about the weather in Brussels in September:
Is September a good time to visit Brussels?
It’s always a good time to visit Brussels, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Brussels in September?
September has mild temperatures in Brussels. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is Brussels rainy in September?
Brussels is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Brussels in September?
Usually, it’s not very sunny in Brussels in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
How much does it cost to fly to Brussels in September?
The normal prices to fly to Brussels is $758 - $758. It means that the majority of our users have picked flights in this range. To find the best price we recommend you search early, using our flexible dates feature.
Other cities in Belgium
Check out the weather for other cities in Belgium.
For this page, we’ve looked at the typical weather in Brussels, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
