September Weather in As, Belgium

Last updated: August 22, 2025

In As, Belgium, the average temperature in September hovers around 15°C (60°F). Expect a minimum of 3°C (37°F) and a maximum soaring up to 34°C (94°F). During this time, precipitation measures approximately 61 mm (2.4 in) over about 10 days, contributing to an average humidity level of 81%. Whether you prefer the cozy chill or the warmth of the sun, September in As offers a wonderfully diverse climate!

September Temperature in As

In September in As, the average temperature is 15°C (60°F). The maximum can reach 34°C (94°F), and the minimum can be as low as 3°C (37°F). Be prepared for a range of temperatures, making it a good idea to pack layers for your travels.

September Weather in As: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in As, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In As, September typically has an average temperature of 15°C (60°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (37°F).

Data source: Temperature data for As generated using information from the Copernicus Climate Change Service.

September Precipitation in As

In As in September, the precipitation amount is 61 mm (2.4 in) over a span of 10 days.

September Precipitation Trends in As

The chart displays monthly precipitation patterns in As, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In As, September typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in As

In As in September, humidity is 81%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sluggish and draining, which can challenge even the best-prepared traveler.

September Average Humidity in As

This chart illustrates the average monthly humidity levels in As, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in As is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in As

In As 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 As.

Maximum UV Index Levels in As for September

The chart shows the monthly maximum UV Index (UVI) for As in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in As typically reaches 5, which falls under the moderate exposure category.

Data source: As September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in As Compares to Other Months

Weather in As varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in As, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in As, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	65 mm (2.6 inches)	91%	low
February Weather	5°C (42°F)	72 mm (2.8 inches)	90%	low
March Weather	7°C (45°F)	76 mm (3.0 inches)	87%	moderate
April Weather	10°C (51°F)	35 mm (1.4 inches)	84%	moderate
May Weather	14°C (58°F)	60 mm (2.4 inches)	77%	high
June Weather	19°C (66°F)	78 mm (3.1 inches)	74%	very high
July Weather	19°C (67°F)	76 mm (3.0 inches)	72%	very high
August Weather	19°C (67°F)	78 mm (3.1 inches)	71%	high
September Weather	15°C (60°F)	61 mm (2.4 inches)	81%	moderate
October Weather	12°C (54°F)	84 mm (3.3 inches)	88%	moderate
November Weather	7°C (45°F)	55 mm (2.2 inches)	91%	low
December Weather	5°C (42°F)	96 mm (3.8 inches)	92%	low