Monthly climate guide
Liège weather in September
September in Liège is typically mild, with average daytime highs around 20°C (68°F) and night-time lows near 10°C (49°F). The month usually brings about 57 mm of rain (some rain) and is often cloudy. Daytime highs are 3°C cooler than August and 5°C warmer than October.
What stands out in September
- Temperatures are falling — expect highs around 5°C lower by October.
- Liège is usually about 2°C warmer than Knokke-Heist, 180 km away, in September.
- Seasonally, September counts as early autumn in Liège.
- It's one of the sunniest months here, with cloud cover around 61%.
Avg high
20°C
68°F
Avg low
10°C
49°F
Rainfall
57 mm
some rain
Humidity
76%
relative
Sky
61%
cloud · often cloudy
Liège weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 4°C / 39°F | -1°C / 31°F | 81 mm | 94% | 80% |
| February | 5°C / 41°F | -1°C / 30°F | 59 mm | 91% | 71% |
| March | 9°C / 49°F | 1°C / 34°F | 51 mm | 86% | 66% |
| April | 14°C / 57°F | 4°C / 39°F | 39 mm | 80% | 63% |
| May | 17°C / 63°F | 7°C / 45°F | 64 mm | 78% | 67% |
| June | 21°C / 70°F | 11°C / 52°F | 79 mm | 76% | 70% |
| July | 23°C / 74°F | 13°C / 55°F | 67 mm | 71% | 67% |
| August | 23°C / 74°F | 13°C / 55°F | 72 mm | 72% | 65% |
| September | 20°C / 68°F | 10°C / 49°F | 57 mm | 76% | 61% |
| October | 15°C / 58°F | 7°C / 44°F | 66 mm | 86% | 71% |
| November | 9°C / 48°F | 3°C / 37°F | 60 mm | 92% | 74% |
| December | 6°C / 42°F | 1°C / 34°F | 90 mm | 94% | 79% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
Is September a good time to visit Liège?
Compare the months in the chart above to find your ideal window.
Best time to visit Liège →Other Belgium cities in September
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Liège weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/belgium/liege/september
<a href="https://weathercompare.eu/weather/belgium/liege/september">Liège weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/belgium/liege" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Liège weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/belgium/liege/september">Liège weather in September</a> – WeatherCompare</p>
Liège in September: quick answers
Is September a good time to visit Liège?
Yes. September is one of the best months for Liège, with highs around 20°C and about 57 mm of rain.
How warm is Liège in September?
Average highs are about 20°C (68°F) and average lows about 10°C (49°F), based on 10 years of daily data.
Does it rain a lot in Liège in September?
Liège typically gets around 57 mm of rain in September — some rain.
Figures are long-term averages for the area around Liège (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.