Last updated: August 22, 2025
In Grand-Halleux, Belgium, the average temperature in September hovers around 13°C (56°F). However, expect a range of conditions: temperatures can dip as low as 1°C (34°F) and soar up to 31°C (88°F). With 82 mm (3.2 in) of precipitation spread across 11 days, you'll want to be prepared for some rain. The average humidity sits at a notable 81%, creating a uniquely refreshing atmosphere. Enjoy your time in this vibrant locale!
In September in Grand-Halleux, the average temperature is 13°C (56°F). Maximums can reach 31°C (88°F) and minimums can be as low as 1°C (34°F). This makes it an ideal time for travelers to experience a range of weather conditions, so be sure to pack accordingly!
In Grand-Halleux in September, the precipitation amount is 82 mm (3.2 in) over the course of 11 days.
In Grand-Halleux in September, humidity is 81%. With an average temperature of 13°C (56°F), this humidity feels like a blanket of damp air that clings to your skin, making it essential to pack breathable clothing and stay hydrated while exploring.
In Grand-Halleux in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Grand-Halleux, you can refer to this Hourly UV Index in Grand-Halleux.
UV Risk Categories
Weather in Grand-Halleux varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grand-Halleux, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 97 mm (3.8 inches) | 91% | low |
| February Weather | 2°C (36°F) | 88 mm (3.5 inches) | 90% | moderate |
| March Weather | 5°C (41°F) | 107 mm (4.2 inches) | 87% | moderate |
| April Weather | 8°C (47°F) | 51 mm (2.0 inches) | 84% | moderate |
| May Weather | 11°C (53°F) | 96 mm (3.8 inches) | 77% | very high |
| June Weather | 16°C (61°F) | 105 mm (4.1 inches) | 74% | very high |
| July Weather | 17°C (62°F) | 93 mm (3.7 inches) | 72% | very high |
| August Weather | 17°C (63°F) | 95 mm (3.7 inches) | 71% | high |
| September Weather | 13°C (56°F) | 82 mm (3.2 inches) | 81% | high |
| October Weather | 10°C (49°F) | 93 mm (3.7 inches) | 88% | moderate |
| November Weather | 5°C (41°F) | 72 mm (2.8 inches) | 91% | low |
| December Weather | 3°C (37°F) | 137 mm (5.4 inches) | 92% | low |