September weather forecastDellen, Luxembourg
September
Weather in September
September marks the beginning of the fall season in Dellen, Luxembourg, characterized by a mild decrease in temperature, shorter daylight hours, and a surge of autumnal hues. September proffers a slight decline in average highs, dropping to 17.5°C (63.5°F), whereas rainfall registers a reduction to 39mm (1.54"). The city starts to embrace a warm palette of colors, with trees shedding leaves in a fiery flurry of reds, oranges, and yellows. Nature walks become an appealing pastime, thanks to the comfortable temperatures and the spectacular colorful scenery. As balmy summer days fade, September brings in the sentimental tones of autumn.Temperature
September reveals a small adjustment in temperature, transitioning from an average high of a pleasant 21.7°C (71.1°F) in August to an enjoyable 17.5°C (63.5°F). The average low-temperature of 8.5°C (47.3°F) is witnessed in Dellen during September.Humidity
The average relative humidity in September is 82%.Rainfall
In Dellen, Luxembourg, in September, during 13.1 rainfall days, 39mm (1.54") of precipitation is typically accumulated. Throughout the year, there are 190.3 rainfall days, and 626mm (24.65") of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Dellen, the average length of the day in September is 12h and 37min.On the first day of the month, sunrise is at 06:52 and sunset at 20:19. On the last day of September, in Dellen, sunrise is at 07:35 and sunset at 19:16 CEST.
Sunshine
The average sunshine in September in Dellen, Luxembourg, is 7.9h.UV index
In Dellen, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 3 suggests these recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dellen, Luxembourg
- Average high temperature in September: 17.5°C
The warmest month (with the highest average high temperature) is August (21.7°C).
The month with the lowest average high temperature is January (2.7°C).
- Average low temperature in September: 8.5°C
The month with the highest average low temperature is August (11.8°C).
The coldest month (with the lowest average low temperature) is January (-1.3°C).
Average pressure in September
Dellen, Luxembourg
- Average pressure in September: 1017.9mbar
The month with the highest atmospheric pressure is December (1018mbar).
The month with the lowest atmospheric pressure is November (1013.9mbar).
Average wind speed in September
Dellen, Luxembourg
- Average wind speed in September: 10.3km/h
The windiest month (with the highest average wind speed) is February (15.9km/h).
The calmest month (with the lowest average wind speed) is August (9.8km/h).
Average humidity in September
Dellen, Luxembourg
- Average humidity in September: 82%
The month with the highest relative humidity is December (92%).
The months with the lowest relative humidity are April and August (79%).
Average rainfall in September
Dellen, Luxembourg
- Average rainfall in September: 39mm
The wettest month (with the highest rainfall) is December (70mm).
The driest month (with the least rainfall) is April (36mm).
Average rainfall days in September
Dellen, Luxembourg
- Average rainfall days in September: 13.1 days
The months with the highest number of rainy days are June and July (19.1 days).
The month with the least rainy days is February (12.7 days).
Average snowfall in September
Dellen, Luxembourg
- Average snowfall in September: 0mm
The month with the highest snowfall is January (78mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Dellen, Luxembourg
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dellen, Luxembourg
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 18min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 18min).
The month with the least sunshine is December (Average sunshine: 2h and 54min).
Average sunshine days in September
Dellen, Luxembourg
- Average sunshine days in September: 13.7 days
The month with the most sunshine days is March (14.3 days).
The month with the least sunshine days is June (8.1 days).
Average UV index in September
Dellen, Luxembourg
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Dellen, Luxembourg
- Average cloud cover in September: 43
The month with the most cloud cover is December (Cloud cover 72).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in September
Dellen, Luxembourg
- Average visibility in September: 8km
The months with the highest visibility are March, April and August (9km).
The months with the lowest visibility are November and December (7km).
