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Weather in Brussels Capital for September 2025

Your guide to Brussels Capital weather in September - trends and predictions
  • In general, the average temperature in Brussels Capital at the beginning of September is 25.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.1 °C by the end of September.

  • Brussels Capital sees moderate rainfall in September, averaging 8 rainy days.

  • Is September a good time to visit Brussels Capital? check out the best time to travel to Brussels Capital page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/14°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
68 %
Avg humidity

Brussels Capital in September average weather

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Temperatures trend during September in Brussels Capital

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
26° /15° 20 mm 7
2 Sept. Patchy rain possible
Patchy rain possible
26° /16° 2.4 mm 6
3 Sept. Mist
Mist
24° /16° 0.1 mm 5
4 Sept. Sunny
Sunny
24° /14° 0.8 mm 6
5 Sept. Sunny
Sunny
25° /15° 6.1 mm 6
6 Sept. Sunny
Sunny
24° /15° 2.3 mm 6
7 Sept. Sunny
Sunny
29° /14° 0.3 mm 8
8 Sept. Sunny
Sunny
26° /16° 1.9 mm 7
9 Sept. Sunny
Sunny
24° /15° 3.8 mm 6
10 Sept. Sunny
Sunny
24° /15° 1.3 mm 6
11 Sept. Moderate rain at times
Moderate rain at times
21° /14° 4.6 mm 5
12 Sept. Overcast
Overcast
19° /11° 0.9 mm 4
13 Sept. Mist
Mist
18° /10° 1.1 mm 5
14 Sept. Cloudy
Cloudy
20° /12° 0.1 mm 5
15 Sept. Partly cloudy
Partly cloudy
22° /10° 0 mm 5
16 Sept. Sunny
Sunny
22° /12° 0.4 mm 6
17 Sept. Patchy rain possible
Patchy rain possible
23° /14° 0.9 mm 5
18 Sept. Patchy rain possible
Patchy rain possible
24° /14° 0.5 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
22° /13° 0 mm 6
20 Sept. Cloudy
Cloudy
22° /13° 0 mm 6
21 Sept. Moderate rain
Moderate rain
22° /12° 8.7 mm 5
22 Sept. Light rain shower
Light rain shower
20° /12° 1.5 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
18° /11° 7 mm 4
24 Sept. Partly cloudy
Partly cloudy
18° /10° 1.2 mm 5
25 Sept. Overcast
Overcast
18° /11° 9.9 mm 4
26 Sept. Partly cloudy
Partly cloudy
20° /13° 3.4 mm 5
27 Sept. Partly cloudy
Partly cloudy
19° /11° 3 mm 5
28 Sept. Partly cloudy
Partly cloudy
17° /10° 2.3 mm 5
29 Sept. Light rain shower
Light rain shower
18° /8° 0.7 mm 4
30 Sept. Partly cloudy
Partly cloudy
17° /9° 2.4 mm 4
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Important Notice
Our weather forecast for Brussels Capital in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Brussels Capital forecast closer to your planned date for the most up-to-date weather information.

Brussels Capital in September - FAQ

What are the expected maximum and minimum temperatures in Brussels Capital during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Brussels Capital during September?
Moderate rainfall is anticipated in Brussels Capital during September, with a total of 70 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Brussels Capital during September?
The average wind speed in Brussels Capital during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Brussels Capital in September?

As you prepare for your trip to Brussels Capital in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Brussels Capital, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

September rainfall patterns in Brussels Capital

Explore the daily rainfall trends and prepare for Brussels Capitals September weather 💧

UV exposure in Brussels Capital during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Brussels Capital?

Get accurate weather forecasts for Brussels Capital, located at latitude 50.85 and longitude 4.349. Stay updated with localized weather information tailored for Brussels Capital.

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