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September Weather in Aach, Germany

Last updated: August 23, 2025

In September, the average temperature in Aach, Germany is a pleasant 15°C (59°F). Expect temperatures to range from a chilly 1°C (35°F) to a warm 30°C (85°F). With an average humidity of 83%, you may notice a bit of stickiness in the air. Be prepared for some rain, as 66 mm (2.6 in) of precipitation is expected over 11 days.

September Temperature in Aach

In September in Aach, the average temperature is 15°C (59°F). Maximum temperatures can reach 30°C (85°F), while the minimum can drop to as low as 1°C (35°F). This diverse temperature range makes it essential for travelers to pack both warm and cool clothing options.

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

The chart illustrates September temperature patterns in Aach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Aach, September typically has an average temperature of 15°C (59°F), with highs reaching up to 30°C (85°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec333842505665676759504036
Data source: Temperature data for Aach 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 Aach

In Aach in September, the precipitation amount is 66 mm (2.6 in) spread over 11 days.

September Precipitation Trends in Aach

The chart displays monthly precipitation patterns in Aach, 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 Aach, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec8163735310911376102667854103
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Aach

In Aach in September humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.

September Average Humidity in Aach

This chart illustrates the average monthly humidity levels in Aach, 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 Aach is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%89%87%84%80%82%83%80%83%90%89%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Aach

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

Maximum UV Index Levels in Aach for September

The chart shows the monthly maximum UV Index (UVI) for Aach 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 Aach typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Aach 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 Aach Compares to Other Months

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

This table compares monthly weather conditions in Aach, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)81 mm (3.2 inches)92%low
February Weather3°C (38°F)63 mm (2.5 inches)89%moderate
March Weather6°C (42°F)73 mm (2.9 inches)87%moderate
April Weather10°C (50°F)53 mm (2.1 inches)84%high
May Weather13°C (56°F)109 mm (4.3 inches)80%very high
June Weather18°C (65°F)113 mm (4.5 inches)82%very high
July Weather20°C (68°F)76 mm (3.0 inches)83%very high
August Weather19°C (67°F)102 mm (4.0 inches)80%very high
September Weather15°C (59°F)66 mm (2.6 inches)83%high
October Weather10°C (50°F)78 mm (3.1 inches)90%moderate
November Weather4°C (40°F)54 mm (2.1 inches)88%low
December Weather2°C (36°F)103 mm (4.1 inches)90%low

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