Brussels Capital (Brussels)
September
Weather in Brussels Capital for September 2025
Your guide to Brussels Capital weather in September - trends and predictions
Until now, September 2025 in Brussels Capital is slightly cooler than the historical average by -1.4 °C.
Expect cooler weather in the next days in Brussels Capital with the forecast suggesting a temperature of 19.6 °C, lower than the historical average.
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 17.4 °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.
Temperatures
Rain 🌧️
7
Dry days
23
Rainy days
0
Snow days
21°/12°
Temperatures
18 km/h
Avg max wind
71 %
Avg humidity
Brussels Capital Weather September
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What’s the Weather Like in Brussels Capital This September?
Discover the average temperatures and weather trends across Brussels Capital’s cities this September.
Temperatures trend during September in Brussels Capital
See the weather trend as well as the moving average line
September weather in Brussels Capital day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 25° /14° | 8 mm | 6 | |
| 2 Sept. | Sunny | 25° /14° | 1.3 mm | 6 | |
| 3 Sept. |  Patchy rain possible | 25° /14° | 0.8 mm | 6 | |
| 4 Sept. | Sunny | 25° /13° | 0.6 mm | 6 | |
| 5 Sept. | Sunny | 25° /14° | 4.1 mm | 6 | |
| 6 Sept. | Sunny | 25° /14° | 3.6 mm | 6 | |
| 7 Sept. | Sunny | 28° /14° | 1 mm | 7 | |
| 8 Sept. | Sunny | 25° /15° | 3 mm | 6 | |
| 9 Sept. | Patchy rain possible | 21° /14° | 3.2 mm | 5 | |
| 10 Sept. |  Heavy rain at times | 22° /14° | 1.8 mm | 5 | |
| 11 Sept. | Patchy rain possible | 21° /13° | 2.5 mm | 5 | |
| 12 Sept. | Light rain shower | 21° /11° | 0.6 mm | 5 | |
| 13 Sept. | Sunny | 19° /11° | 5.2 mm | 5 | |
| 14 Sept. | Patchy rain possible | 20° /12° | 3.9 mm | 5 | |
| 15 Sept. | Patchy rain possible | 21° /12° | 1 mm | 5 | |
| 16 Sept. | Patchy rain possible | 19° /12° | 0.8 mm | 0.7 | |
| 17 Sept. |  Overcast | 22° /11° | 0.1 mm | 0.3 | |
| 18 Sept. | Sunny | 26° /13° | 0 mm | 1.1 | |
| 19 Sept. | Sunny | 31° /15° | 0 mm | 1 | |
| 20 Sept. |  Moderate rain | 21° /14° | 5.4 mm | 0.4 | |
| 21 Sept. | Patchy rain possible | 18° /10° | 0.2 mm | 3 | |
| 22 Sept. |  Partly cloudy | 16° /7° | 0 mm | 4 | |
| 23 Sept. | Partly cloudy | 16° /9° | 0 mm | 4 | |
| 24 Sept. | Patchy rain possible | 17° /10° | 0.3 mm | 3 | |
| 25 Sept. | Patchy rain possible | 13° /10° | 2.9 mm | 3 | |
| 26 Sept. | Patchy rain possible | 15° /11° | 0.4 mm | 3 | |
| 27 Sept. | Sunny | 19° /8° | 0.1 mm | 4 | |
| 28 Sept. | Sunny | 21° /11° | 0 mm | 5 | |
| 29 Sept. | Sunny | 21° /9° | 0 mm | 4 | |
| 30 Sept. | Overcast | 16° /7° | 1.5 mm | 4 | |
| Next | |||||
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.
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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.
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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