September weather forecastAltrier, Luxembourg
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Altrier, Luxembourg, with an average temperature varying between 18.5°C (65.3°F) and 9°C (48.2°F).Temperature
September's onset introduces a mild reduction in the average high-temperature, from an agreeable 22.6°C (72.7°F) in August to an enjoyable 18.5°C (65.3°F). During September in Altrier, the average low-temperature is recorded at a chilly 9°C (48.2°F).Humidity
In Altrier, the average relative humidity in September is 80%.Rainfall
In Altrier, Luxembourg, in September, during 9.6 rainfall days, 26mm (1.02") of precipitation is typically accumulated. Throughout the year, there are 170 rainfall days, and 516mm (20.31") of precipitation is accumulated.Snowfall
In Altrier, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 37min.On the first day of September, sunrise is at 06:50 and sunset at 20:18. On the last day of the month, sunrise is at 07:33 and sunset at 19:15 CEST.
Sunshine
In September, the average sunshine is 8.2h.UV index
In September, the average daily maximum UV index in Altrier is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 3 during September leads to these advisories:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Altrier, Luxembourg
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is July (22.7°C).
The month with the lowest average high temperature is January (3.1°C).
- Average low temperature in September: 9°C
The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is January (-1.3°C).
Average pressure in September
Altrier, Luxembourg
- Average pressure in September: 1017.9mbar
The month with the highest atmospheric pressure is December (1018.3mbar).
The month with the lowest atmospheric pressure is November (1014.2mbar).
Average wind speed in September
Altrier, Luxembourg
- Average wind speed in September: 9.8km/h
The windiest month (with the highest average wind speed) is February (14.7km/h).
The calmest month (with the lowest average wind speed) is August (9.4km/h).
Average humidity in September
Altrier, Luxembourg
- Average humidity in September: 80%
The month with the highest relative humidity is December (91%).
The months with the lowest relative humidity are April and August (76%).
Average rainfall in September
Altrier, Luxembourg
- Average rainfall in September: 26mm
The wettest month (with the highest rainfall) is December (69mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in September
Altrier, Luxembourg
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is September (9.6 days).
Average snowfall in September
Altrier, Luxembourg
- Average snowfall in September: 0mm
The months with the highest snowfall are January and December (66mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Altrier, Luxembourg
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Altrier, 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: 8h and 12min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is December (Average sunshine: 3h and 6min).
Average sunshine days in September
Altrier, Luxembourg
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is August (17.6 days).
The month with the least sunshine days is December (7.6 days).
Average UV index in September
Altrier, 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, November and December (UV index 2).
Average cloud cover in September
Altrier, Luxembourg
- Average cloud cover in September: 40
The month with the most cloud cover is December (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in September
Altrier, Luxembourg
- Average visibility in September: 8km
The months with the highest visibility are March, April, July and August (9km).
The months with the lowest visibility are November and December (7km).
