Last updated: August 22, 2025
In September, the average temperature in Sint-Niklaas, Belgium hovers around 16°C (60°F). Expect a pleasant range where minimums can dip to 4°C (40°F) and maximums might soar to 32°C (90°F). Be prepared for some wet days, as 56 mm (2.2 in) of precipitation typically falls over about 10 days. With an average humidity of 82%, it's a season where the air feels comfortably crisp yet slightly damp.
In September in Sint-Niklaas, the average temperature is 16°C (60°F), with maximums reaching 32°C (90°F) and minimums dropping as low as 4°C (40°F). This range makes it an ideal destination for travelers seeking moderate weather and a variety of outdoor activities.
In Sint-Niklaas in September, the precipitation amount is 56 mm (2.2 in) over the course of 10 days.
In Sint-Niklaas in September humidity is 82%. With an average temperature of 16°C (60°F), this humidity feels like walking through a warm, thick blanket that clings to your skin, making every step feel heavier and travel more exhausting.
In Sint-Niklaas 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 Sint-Niklaas.
UV Risk Categories
Weather in Sint-Niklaas varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sint-Niklaas, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (40°F) | 63 mm (2.5 inches) | 91% | low |
| February Weather | 6°C (42°F) | 66 mm (2.6 inches) | 89% | low |
| March Weather | 7°C (46°F) | 69 mm (2.7 inches) | 87% | moderate |
| April Weather | 10°C (51°F) | 39 mm (1.5 inches) | 85% | moderate |
| May Weather | 14°C (57°F) | 64 mm (2.5 inches) | 82% | high |
| June Weather | 18°C (65°F) | 70 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) | 75 mm (3.0 inches) | 76% | high |
| September Weather | 16°C (60°F) | 56 mm (2.2 inches) | 82% | moderate |
| October Weather | 13°C (55°F) | 83 mm (3.3 inches) | 89% | moderate |
| November Weather | 8°C (46°F) | 54 mm (2.1 inches) | 92% | low |
| December Weather | 6°C (43°F) | 91 mm (3.6 inches) | 92% | low |