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September Weather in Hennef, Germany

Last updated: August 23, 2025

In Hennef, Germany, the average temperature in September hovers around 15°C (60°F). Expect a range of temperatures, with a minimum of 2°C (36°F) and a maximum soaring to 33°C (92°F). Precipitation can be expected, totaling 61 mm (2.4 in) over approximately 10 days. The average humidity stands at a notable 81%, adding a touch of warmth to the air.

September Temperature in Hennef

In September in Hennef, the average temperature is 15°C (60°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 2°C (36°F). Pack layers to enjoy both warm afternoons and cool evenings while exploring the area.

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

The chart illustrates September temperature patterns in Hennef, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hennef, September typically has an average temperature of 15°C (60°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec374044505766676760534440
Data source: Temperature data for Hennef 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 Hennef

In Hennef in September, the precipitation amount is 61 mm (2.4 in) over a span of 10 days.

September Precipitation Trends in Hennef

The chart displays monthly precipitation patterns in Hennef, 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 Hennef, September typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8379853973679182618059118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hennef

In Hennef in September, humidity is 81%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sluggish and draining, which can challenge even the best-prepared traveler.

September Average Humidity in Hennef

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

In Hennef 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 Hennef.

Maximum UV Index Levels in Hennef for September

The chart shows the monthly maximum UV Index (UVI) for Hennef 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 Hennef typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Hennef 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 Hennef Compares to Other Months

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

This table compares monthly weather conditions in Hennef, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)83 mm (3.3 inches)91%low
February Weather4°C (40°F)79 mm (3.1 inches)90%low
March Weather7°C (44°F)85 mm (3.3 inches)87%moderate
April Weather10°C (50°F)39 mm (1.5 inches)84%moderate
May Weather14°C (57°F)73 mm (2.9 inches)77%high
June Weather19°C (66°F)67 mm (2.6 inches)74%very high
July Weather19°C (67°F)91 mm (3.6 inches)72%very high
August Weather19°C (67°F)82 mm (3.2 inches)71%high
September Weather15°C (60°F)61 mm (2.4 inches)81%moderate
October Weather12°C (53°F)80 mm (3.2 inches)88%moderate
November Weather7°C (44°F)59 mm (2.3 inches)91%low
December Weather5°C (41°F)118 mm (4.7 inches)92%low

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