September weather forecastAachen, Germany
September
Weather in September
In Aachen, Germany, September signifies the onset of autumn, hinted at by the falling temperatures. With the highs dipping to 18.8°C (65.8°F) and the lows to a cooler 10.5°C (50.9°F), the change in seasons becomes evident. The shift to this transitional period brings a decrease in sunshine hours and rainfall, typical of the approaching fall. The transformation of green landscapes into a play of orange, brown, and gold foliage adds to the unique charm of Aachen in September. This month brings forth a seasonal appeal that is both visually pleasing and comfortably temperate.Temperature
The onset of September in Aachen entails a subtle temperature shift, as the average high-temperature eases from a pleasant 22.7°C (72.9°F) in August to an enjoyable 18.8°C (65.8°F). The mean low-temperature during September nights is a cool 10.5°C (50.9°F).Humidity
In Aachen, the average relative humidity in September is 79%.Rainfall
In Aachen, in September, it is raining for 13.4 days, with typically 32mm (1.26") of accumulated precipitation. In Aachen, during the entire year, the rain falls for 185.5 days and collects up to 509mm (20.04") of precipitation.Snowfall
April through October are months without snowfall in Aachen.Daylight
In Aachen, the average length of the day in September is 12h and 37min.On the first day of September in Aachen, sunrise is at 06:50 and sunset at 20:20. On the last day of the month, sunrise is at 07:35 and sunset at 19:15 CEST.
Sunshine
The average sunshine in September in Aachen, Germany, is 8.1h.UV index
In Aachen, Germany, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 3 in September translates into these instructions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Aachen, Germany
- Average high temperature in September: 18.8°C
The warmest month (with the highest average high temperature) is August (22.7°C).
The month with the lowest average high temperature is January (4.3°C).
- Average low temperature in September: 10.5°C
The month with the highest average low temperature is August (13.7°C).
The coldest month (with the lowest average low temperature) is January (0.3°C).
Average pressure in September
Aachen, Germany
- Average pressure in September: 1017.6mbar
The month with the highest atmospheric pressure is September (1017.6mbar).
The month with the lowest atmospheric pressure is November (1013.1mbar).
Average wind speed in September
Aachen, Germany
- Average wind speed in September: 11.2km/h
The windiest month (with the highest average wind speed) is December (17.3km/h).
The calmest month (with the lowest average wind speed) is August (11km/h).
Average humidity in September
Aachen, Germany
- Average humidity in September: 79%
The months with the highest relative humidity are January and December (87%).
The months with the lowest relative humidity are April and August (75%).
Average rainfall in September
Aachen, Germany
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is June (55mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Aachen, Germany
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (19.4 days).
The month with the least rainy days is February (12.1 days).
Average snowfall in September
Aachen, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is February (53mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Aachen, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Aachen, Germany
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in September: 8h and 6min
The month with the most sunshine is August (Average sunshine: 9h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
Aachen, Germany
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is October (14.5 days).
The month with the least sunshine days is June (9 days).
Average UV index in September
Aachen, Germany
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Aachen, Germany
- Average cloud cover in September: 40
The month with the most cloud cover is December (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in September
Aachen, Germany
- Average visibility in September: 9km
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January and December (8km).
