September Weather in Belgium, United States

Last updated: June 24, 2025

In September, the average temperature in Belgium, United States hovers around 18°C (65°F), with a comfortable range between a minimum of 9°C (48°F) and a maximum of 25°C (77°F). Expect 93 mm (3.7 in) of precipitation spread over 9 days, and prepare for a fairly humid atmosphere, with average humidity levels reaching 79%. Enjoy the blend of mild temperatures and lush greenery!

September Temperature in Belgium

In September in Belgium, the average temperature is 18°C (65°F). Maximums can reach up to 25°C (77°F), while minimums can dip as low as 9°C (48°F). This generally mild weather makes it a great time for outdoor activities and exploring the local attractions.

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

The chart illustrates September temperature patterns in Belgium, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belgium, September typically has an average temperature of 18°C (65°F), with highs reaching up to 25°C (77°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Belgium

In Belgium in September, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.

September Precipitation Trends in Belgium

The chart displays monthly precipitation patterns in Belgium, 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 Belgium, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Belgium

In Belgium in September, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

September Average Humidity in Belgium

This chart illustrates the average monthly humidity levels in Belgium, 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 Belgium is approximately 79%, 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 Belgium

In Belgium in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Belgium.

Maximum UV Index Levels in Belgium for September

The chart shows the monthly maximum UV Index (UVI) for Belgium 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 Belgium typically reaches 7, which falls under the high exposure category.

Data source: Belgium 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 Belgium Compares to Other Months

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

This table compares monthly weather conditions in Belgium, 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 (26°F)	61 mm (2.4 inches)	85%	low
February Weather	-4°C (26°F)	60 mm (2.4 inches)	85%	moderate
March Weather	1°C (33°F)	69 mm (2.7 inches)	85%	moderate
April Weather	4°C (39°F)	107 mm (4.2 inches)	85%	very high
May Weather	8°C (47°F)	126 mm (5.0 inches)	78%	very high
June Weather	14°C (58°F)	96 mm (3.8 inches)	80%	very high
July Weather	20°C (68°F)	80 mm (3.1 inches)	78%	very high
August Weather	21°C (70°F)	69 mm (2.7 inches)	76%	very high
September Weather	18°C (65°F)	93 mm (3.7 inches)	79%	high
October Weather	12°C (53°F)	126 mm (5.0 inches)	83%	moderate
November Weather	4°C (39°F)	58 mm (2.3 inches)	88%	moderate
December Weather	0°C (33°F)	59 mm (2.3 inches)	81%	low