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September Weather in Mertloch, Germany

Last updated: August 23, 2025

In Mertloch, Germany, the average temperature in September hovers around 14°C (58°F). Expect it to range from a chilly 2°C (36°F) at its lowest to a warm 31°C (87°F) at peak. The month sees around 49 mm (1.9 in) of precipitation spread over 8 days, contributing to an average humidity of 81%.

September Temperature in Mertloch

In September in Mertloch, the average temperature is 14°C (58°F). Maximums can reach 31°C (87°F) and minimums can drop as low as 2°C (36°F). Travelers should pack for a range of weather conditions to fully enjoy their stay.

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

The chart illustrates September temperature patterns in Mertloch, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mertloch, September typically has an average temperature of 14°C (58°F), with highs reaching up to 31°C (87°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec353842485564656558514238
Data source: Temperature data for Mertloch 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 Mertloch

In Mertloch in September, the precipitation amount is 49 mm (1.9 in) spread over 8 days.

September Precipitation Trends in Mertloch

The chart displays monthly precipitation patterns in Mertloch, 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 Mertloch, September typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec605667387177716749564889
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mertloch

In Mertloch in September, humidity is 81%. With an average temperature of 14°C (58°F), this humidity feels like a warm blanket wrapping around you, making outdoor adventures sticky and challenging, while also providing a lush, vibrant atmosphere perfect for exploring.

September Average Humidity in Mertloch

This chart illustrates the average monthly humidity levels in Mertloch, 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 Mertloch is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%87%84%77%74%72%71%81%88%91%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mertloch

In Mertloch 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 Mertloch.

Maximum UV Index Levels in Mertloch for September

The chart shows the monthly maximum UV Index (UVI) for Mertloch 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 Mertloch typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234588875421
Data source: Mertloch 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 Mertloch Compares to Other Months

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

This table compares monthly weather conditions in Mertloch, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)60 mm (2.3 inches)91%low
February Weather3°C (38°F)56 mm (2.2 inches)90%moderate
March Weather6°C (42°F)67 mm (2.7 inches)87%moderate
April Weather9°C (48°F)38 mm (1.5 inches)84%moderate
May Weather13°C (55°F)71 mm (2.8 inches)77%very high
June Weather18°C (64°F)77 mm (3.0 inches)74%very high
July Weather18°C (65°F)71 mm (2.8 inches)72%very high
August Weather18°C (65°F)67 mm (2.6 inches)71%high
September Weather14°C (58°F)49 mm (1.9 inches)81%moderate
October Weather11°C (51°F)56 mm (2.2 inches)88%moderate
November Weather5°C (42°F)48 mm (1.9 inches)91%low
December Weather3°C (39°F)89 mm (3.5 inches)92%low

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