September Weather in Treignes, Belgium

Last updated: August 22, 2025

In September, the average temperature in Treignes, Belgium hovers around 15°C (59°F). Expect a minimum of 2°C (37°F) on cooler days, while temperatures can soar to a maximum of 33°C (92°F). With 69 mm (2.7 in) of precipitation over 10 days, it's wise to keep an umbrella handy. Additionally, the air is notably humid with an average humidity of 81%, contributing to the unique climate of the region.

September Temperature in Treignes

In September in Treignes, the average temperature is 15°C (59°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 2°C (37°F). This unpredictable weather makes it essential to pack layers when traveling to Treignes during this month.

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

The chart illustrates September temperature patterns in Treignes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Treignes, September typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (37°F).

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

September Precipitation in Treignes

In Treignes in September, the precipitation amount is 69 mm (2.7 in) spread over a period of 10 days.

September Precipitation Trends in Treignes

The chart displays monthly precipitation patterns in Treignes, 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 Treignes, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 10 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 Treignes

In Treignes in September humidity is 81%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket draped over you, making traveling quite uncomfortable as you constantly wipe away beads of sweat and feel the stickiness clinging to your clothes.

September Average Humidity in Treignes

This chart illustrates the average monthly humidity levels in Treignes, 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 Treignes 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 Treignes

In Treignes 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 Treignes.

Maximum UV Index Levels in Treignes for September

The chart shows the monthly maximum UV Index (UVI) for Treignes 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 Treignes typically reaches 5, which falls under the moderate exposure category.

Data source: Treignes 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 Treignes Compares to Other Months

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

This table compares monthly weather conditions in Treignes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	83 mm (3.3 inches)	91%	low
February Weather	4°C (40°F)	83 mm (3.3 inches)	89%	moderate
March Weather	6°C (44°F)	93 mm (3.7 inches)	86%	moderate
April Weather	9°C (49°F)	48 mm (1.9 inches)	84%	high
May Weather	13°C (55°F)	77 mm (3.0 inches)	82%	very high
June Weather	17°C (63°F)	81 mm (3.2 inches)	82%	very high
July Weather	18°C (65°F)	78 mm (3.1 inches)	80%	very high
August Weather	18°C (65°F)	84 mm (3.3 inches)	76%	high
September Weather	15°C (59°F)	69 mm (2.7 inches)	81%	moderate
October Weather	11°C (52°F)	100 mm (3.9 inches)	88%	moderate
November Weather	6°C (43°F)	71 mm (2.8 inches)	92%	low
December Weather	4°C (40°F)	130 mm (5.1 inches)	93%	low