September weather forecastMertert, Luxembourg
September weather forecast for Mertert, Luxembourg: In September, on the first day of the month, sunrise is at 06:50 and sunset at 20:17. In Mertert, in September, it is raining for 9.6 days, with typically 26mm (1.02") of accumulated precipitation.
September
Weather in September
September brings the first hints of fall to Mertert. The days grow shorter, and there is a visible drop in temperature. However, with an average high of 18.5°C (65.3°F), this month still offers pleasant weather. A decrease in rainfall makes this a relatively dry month, adding to the charm of early autumn. Additionally, a drop in humidity levels and slightly increased wind speed contribute to creating a comfortable atmosphere.Temperature
September marks a gentle change in average high-temperature, declining from August's pleasant 22.6°C (72.7°F) to an enjoyable 18.5°C (65.3°F). The average temperature drops to a chilly 9°C (48.2°F) during the night in the month of September.Humidity
In September, the average relative humidity is 80%.Rainfall
In September, the rain falls for 9.6 days. Throughout September, 26mm (1.02") of precipitation is accumulated. Throughout the year, there are 170 rainfall days, and 516mm (20.31") of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Mertert, the average length of the day in September is 12h and 36min.On the first day of the month, sunrise is at 06:50 and sunset at 20:17. On the last day of September, sunrise is at 07:33 and sunset at 19:14 CEST.
Sunshine
In September, the average sunshine is 8.2h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mertert, 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
Mertert, 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
Mertert, 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
Mertert, 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
Mertert, 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
Mertert, 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
Mertert, 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
Mertert, 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
Mertert, Luxembourg
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 12min).
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
Mertert, 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
Mertert, 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
Mertert, 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
Mertert, 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).
