Brussels Capital (Brussels)
September
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 25.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.3 °C by the end of September.
Brussels Capital experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 79 mm.
Is September a good time to visit Brussels Capital? check out the best time to travel to Brussels Capital page.
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Temperatures
Rain 🌧️
More
7
Dry days
23
Rainy days
0
Snow days
21°/12°
Temperatures
18 km/h
Avg max wind
71 %
Avg humidity
Brussels Capital in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2 26° | 3  25° | 4 25° | 5 26° | 6 25° | 7 27° |
| 8 25° | 9 22° | 10  22° | 11 21° | 12 22° | 13 20° | 14  19° |
| 15 21° | 16  20° | 17 21° | 18 21° | 19 21° | 20  20° | 21 20° |
| 22 20° | 23 19° | 24 18° | 25  19° | 26 19° | 27 17° | 28 16° |
| 29 16° | 30 16° |
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Temperatures trend during September in Brussels Capital
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Sunny | 25° /14° | 10 mm | 7 | |
| 2 Sept. | Sunny | 26° /15° | 1.2 mm | 6 | |
| 3 Sept. | Patchy rain possible | 25° /14° | 0.3 mm | 6 | |
| 4 Sept. | Sunny | 25° /13° | 0.4 mm | 6 | |
| 5 Sept. | Sunny | 26° /14° | 5.1 mm | 6 | |
| 6 Sept. | Sunny | 25° /15° | 4.5 mm | 6 | |
| 7 Sept. | Sunny | 27° /14° | 1.1 mm | 7 | |
| 8 Sept. | Sunny | 25° /15° | 3.5 mm | 6 | |
| 9 Sept. | Patchy rain possible | 22° /15° | 2.6 mm | 5 | |
| 10 Sept. | Heavy rain at times | 22° /15° | 2.2 mm | 5 | |
| 11 Sept. | Patchy rain possible | 21° /13° | 2.5 mm | 5 | |
| 12 Sept. | Patchy rain possible | 22° /11° | 0.5 mm | 5 | |
| 13 Sept. | Sunny | 20° /11° | 5 mm | 5 | |
| 14 Sept. | Moderate or heavy rain shower | 19° /12° | 4.8 mm | 5 | |
| 15 Sept. | Heavy rain at times | 21° /11° | 0.8 mm | 5 | |
| 16 Sept. | Overcast | 20° /11° | 0.9 mm | 5 | |
| 17 Sept. | Patchy rain possible | 21° /12° | 1.7 mm | 5 | |
| 18 Sept. | Patchy rain possible | 21° /12° | 1.3 mm | 5 | |
| 19 Sept. | Patchy rain possible | 21° /11° | 0.1 mm | 5 | |
| 20 Sept. | Cloudy | 20° /11° | 0 mm | 5 | |
| 21 Sept. | Sunny | 20° /10° | 4.4 mm | 5 | |
| 22 Sept. | Sunny | 20° /10° | 0.8 mm | 5 | |
| 23 Sept. | Overcast | 19° /10° | 4.1 mm | 4 | |
| 24 Sept. | Patchy rain possible | 18° /11° | 2.6 mm | 5 | |
| 25 Sept. | Partly cloudy | 19° /11° | 5.4 mm | 5 | |
| 26 Sept. | Patchy rain possible | 19° /12° | 4.8 mm | 5 | |
| 27 Sept. | Moderate or heavy rain shower | 17° /10° | 3.9 mm | 4 | |
| 28 Sept. | Patchy rain possible | 16° /9° | 1.4 mm | 4 | |
| 29 Sept. | Moderate or heavy rain shower | 16° /7° | 1.7 mm | 4 | |
| 30 Sept. | Overcast | 16° /7° | 1.5 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 21° and cooler nights around 12°. 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 79 mm spread over approximately 23 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 18 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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