Wallonia
September
Weather in Wallonia for September 2025
Your guide to Wallonia weather in September - trends and predictions
In general, the average temperature in Wallonia at the beginning of September is 25.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.9 °C by the end of September.
The climate of Wallonia in September is notably wet, with an average of 11 rainy days.
Is September a good time to visit Wallonia? check out the best time to travel to Wallonia page.
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19
Dry days
11
Rainy days
0
Snow days
23°/13°
Temperatures
15 km/h
Avg max wind
71 %
Avg humidity
Wallonia in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2 26° | 3  25° | 4 22° | 5  27° | 6 24° | 7 29° |
| 8 26° | 9  23° | 10 24° | 11 22° | 12  19° | 13  17° | 14 19° |
| 15 21° | 16 21° | 17 23° | 18 23° | 19 22° | 20 23° | 21 22° |
| 22  20° | 23 18° | 24 18° | 25 18° | 26 19° | 27 19° | 28 17° |
| 29 18° | 30 16° |
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Temperatures trend during September in Wallonia
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. | Light rain shower | 25° /14° | 19.1 mm | 6 | |
| 2 Sept. | Patchy rain possible | 26° /15° | 6.5 mm | 6 | |
| 3 Sept. | Partly cloudy | 25° /15° | 0.6 mm | 6 | |
| 4 Sept. | Partly cloudy | 22° /12° | 3.3 mm | 6 | |
| 5 Sept. | Sunny | 27° /14° | 5.3 mm | 7 | |
| 6 Sept. | Sunny | 24° /13° | 0.7 mm | 6 | |
| 7 Sept. | Sunny | 29° /13° | 0.5 mm | 7 | |
| 8 Sept. | Sunny | 26° /14° | 0.3 mm | 6 | |
| 9 Sept. | Overcast | 23° /14° | 6 mm | 5 | |
| 10 Sept. | Sunny | 24° /13° | 1.2 mm | 6 | |
| 11 Sept. | Sunny | 22° /12° | 9.2 mm | 5 | |
| 12 Sept. | Cloudy | 19° /10° | 3.5 mm | 5 | |
| 13 Sept. | Fog | 17° /7° | 1.1 mm | 4 | |
| 14 Sept. | Cloudy | 19° /8° | 0 mm | 5 | |
| 15 Sept. | Sunny | 21° /7° | 0 mm | 6 | |
| 16 Sept. | Patchy rain possible | 21° /11° | 1.6 mm | 5 | |
| 17 Sept. | Light rain shower | 23° /13° | 6.9 mm | 6 | |
| 18 Sept. | Overcast | 23° /13° | 1.3 mm | 6 | |
| 19 Sept. | Cloudy | 22° /11° | 0.6 mm | 6 | |
| 20 Sept. | Cloudy | 23° /12° | 0 mm | 6 | |
| 21 Sept. | Light rain shower | 22° /11° | 2.9 mm | 6 | |
| 22 Sept. | Moderate or heavy rain with thunder | 20° /11° | 1.6 mm | 5 | |
| 23 Sept. | Light rain shower | 18° /10° | 2.3 mm | 4 | |
| 24 Sept. | Cloudy | 18° /9° | 1.8 mm | 5 | |
| 25 Sept. | Sunny | 18° /11° | 7.8 mm | 5 | |
| 26 Sept. | Sunny | 19° /12° | 3.5 mm | 5 | |
| 27 Sept. | Overcast | 19° /10° | 3.2 mm | 4 | |
| 28 Sept. | Cloudy | 17° /8° | 2.9 mm | 4 | |
| 29 Sept. | Light rain shower | 18° /8° | 1 mm | 4 | |
| 30 Sept. | Partly cloudy | 16° /7° | 1.3 mm | 4 | |
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Important Notice
Our weather forecast for Wallonia 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 Wallonia forecast closer to your planned date for the most up-to-date weather information.
Wallonia in September - FAQ
What are the expected maximum and minimum temperatures in Wallonia during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Wallonia during September?
Moderate rainfall is anticipated in Wallonia during September, with a total of 84.2 mm spread over approximately 11 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Wallonia during September?
The average wind speed in Wallonia during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Wallonia in September?
As you prepare for your trip to Wallonia 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 Wallonia, 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 Wallonia
Explore the daily rainfall trends and prepare for Wallonias September weather 💧
UV exposure in Wallonia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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