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September Weather in Mersch, Luxembourg

Last updated: August 23, 2025

In Mersch, Luxembourg, the average temperature in September hovers around 14°C (58°F). However, be prepared for a range, as temperatures can dip to 3°C (38°F) and soar up to 32°C (90°F). This month also sees an average precipitation of 64 mm (2.5 in) spread over 10 days, contributing to an average humidity level of 83%. Embrace the varied climate while planning your adventures!

September Temperature in Mersch

In September in Mersch, the average temperature is 14°C (58°F). Maximums can reach 32°C (90°F), and minimums can be as low as 3°C (38°F). Travelers should pack for a range of temperatures to ensure comfort during their stay.

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

The chart illustrates September temperature patterns in Mersch, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mersch, September typically has an average temperature of 14°C (58°F), with highs reaching up to 32°C (90°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec353842485563656558514238
Data source: Temperature data for Mersch generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Mersch

In Mersch in September, the precipitation amount is 64 mm (2.5 in) over a span of 10 days.

September Precipitation Trends in Mersch

The chart displays monthly precipitation patterns in Mersch, 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 Mersch, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7276834174777366648069122
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mersch

In Mersch in September, humidity is 83%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket enveloping you, making exploration feel heavier and sweatier, so be prepared for a slower pace while traveling.

September Average Humidity in Mersch

This chart illustrates the average monthly humidity levels in Mersch, 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 Mersch is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%88%84%81%82%82%80%83%89%91%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mersch

In Mersch 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 Mersch, you can refer to this Hourly UV Index in Mersch.

Maximum UV Index Levels in Mersch for September

The chart shows the monthly maximum UV Index (UVI) for Mersch 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 Mersch typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234689886421
Data source: Mersch 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 Mersch Compares to Other Months

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

This table compares monthly weather conditions in Mersch, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)72 mm (2.8 inches)91%low
February Weather3°C (38°F)75 mm (3.0 inches)90%moderate
March Weather6°C (43°F)83 mm (3.2 inches)88%moderate
April Weather9°C (49°F)41 mm (1.6 inches)84%high
May Weather13°C (55°F)74 mm (2.9 inches)81%very high
June Weather17°C (64°F)77 mm (3.0 inches)82%very high
July Weather18°C (65°F)73 mm (2.9 inches)82%very high
August Weather18°C (65°F)66 mm (2.6 inches)80%very high
September Weather14°C (58°F)64 mm (2.5 inches)83%high
October Weather10°C (51°F)80 mm (3.2 inches)89%moderate
November Weather5°C (42°F)69 mm (2.7 inches)91%low
December Weather4°C (39°F)122 mm (4.8 inches)93%low

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