nomadseason

September Weather in Altenau, Germany

Last updated: August 23, 2025

In September, the average temperature in Altenau, Germany hovers around 14°C (57°F). You might experience a chilly minimum of 0°C (33°F), but it could also reach a warm maximum of 30°C (86°F). Be prepared for approximately 60 mm (2.4 in) of precipitation over 11 days, accompanied by an average humidity of 83%.

September Temperature in Altenau

In September, in Altenau, the average temperature is 14°C (57°F). Maximums can reach 30°C (86°F), while minimums can drop as low as 0°C (33°F). Be prepared for a range of weather conditions, making it an ideal time for versatile outdoor activities.

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

The chart illustrates September temperature patterns in Altenau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altenau, September typically has an average temperature of 14°C (57°F), with highs reaching up to 30°C (86°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec333439465363636456504136
Data source: Temperature data for Altenau generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Altenau

In Altenau in September, the precipitation amount is 60 mm (2.4 in) over the course of 11 days.

September Precipitation Trends in Altenau

The chart displays monthly precipitation patterns in Altenau, 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 Altenau, September typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec737273457486877860774777
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Altenau

In Altenau in September, humidity is 83%. With an average temperature of 14°C (57°F), this humidity feels like you're stepping into a warm, damp embrace that can make outdoor activities quite uncomfortable, often leaving you sweaty and exhausted if you're not prepared with plenty of water and breathable clothing.

September Average Humidity in Altenau

This chart illustrates the average monthly humidity levels in Altenau, 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 Altenau is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%88%83%75%79%79%79%83%87%90%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Altenau

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

Maximum UV Index Levels in Altenau for September

The chart shows the monthly maximum UV Index (UVI) for Altenau 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 Altenau typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Altenau 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 Altenau Compares to Other Months

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

This table compares monthly weather conditions in Altenau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)73 mm (2.9 inches)91%low
February Weather1°C (34°F)72 mm (2.8 inches)90%low
March Weather4°C (39°F)73 mm (2.9 inches)88%moderate
April Weather8°C (46°F)45 mm (1.8 inches)83%moderate
May Weather12°C (54°F)74 mm (2.9 inches)75%high
June Weather17°C (63°F)86 mm (3.4 inches)79%very high
July Weather17°C (64°F)87 mm (3.4 inches)79%very high
August Weather18°C (64°F)78 mm (3.1 inches)79%high
September Weather14°C (57°F)60 mm (2.4 inches)83%high
October Weather10°C (50°F)77 mm (3.0 inches)87%moderate
November Weather5°C (41°F)47 mm (1.9 inches)90%low
December Weather2°C (36°F)77 mm (3.0 inches)92%low

Compare Altenau's Climate with Cities Worldwide