Last updated: August 22, 2025
In September, the average temperature in Lasne-Chapelle-Saint-Lambert, Belgium hovers around 15°C (60°F). Expect a range from a cool 4°C (39°F) to a warm 33°C (91°F). During this time, precipitation averages 58 mm (2.3 in) spread across 10 days, and you can anticipate a high humidity level of around 82%.
In September in Lasne-Chapelle-Saint-Lambert, the average temperature is 15°C (60°F). Maximums can reach 33°C (91°F) and minimums can be as low as 4°C (39°F). This makes Lasne-Chapelle-Saint-Lambert a great destination for travelers looking to enjoy mild weather and outdoor activities.
In Lasne-Chapelle-Saint-Lambert in September, the total precipitation amount is 58 mm (2.3 in), measured over a span of 10 days.
In Lasne-Chapelle-Saint-Lambert in September humidity is 82%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and draining, which can hinder your travel experience.
In Lasne-Chapelle-Saint-Lambert in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Lasne-Chapelle-Saint-Lambert.
UV Risk Categories
Weather in Lasne-Chapelle-Saint-Lambert varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Lasne-Chapelle-Saint-Lambert, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 65 mm (2.6 inches) | 91% | low |
| February Weather | 5°C (42°F) | 70 mm (2.7 inches) | 89% | low |
| March Weather | 7°C (45°F) | 71 mm (2.8 inches) | 87% | moderate |
| April Weather | 10°C (50°F) | 36 mm (1.4 inches) | 85% | moderate |
| May Weather | 13°C (57°F) | 60 mm (2.4 inches) | 82% | high |
| June Weather | 18°C (65°F) | 72 mm (2.8 inches) | 82% | very high |
| July Weather | 19°C (66°F) | 74 mm (2.9 inches) | 80% | very high |
| August Weather | 19°C (66°F) | 84 mm (3.3 inches) | 76% | high |
| September Weather | 15°C (60°F) | 58 mm (2.3 inches) | 82% | moderate |
| October Weather | 12°C (54°F) | 78 mm (3.1 inches) | 89% | moderate |
| November Weather | 7°C (45°F) | 57 mm (2.3 inches) | 92% | low |
| December Weather | 5°C (42°F) | 92 mm (3.6 inches) | 92% | low |