September weather forecastBöllen, Germany
September
Weather in September
September, the first month of the autumn in Böllen, is still a comfortable month, with an average temperature fluctuating between 8.2°C (46.8°F) and 18.4°C (65.1°F).Temperature
Böllen's weather subtly changes with the onset of September, barely falling from an agreeable 22.8°C (73°F) in August to an enjoyable 18.4°C (65.1°F). Böllen, during the nights of September, experiences an average temperature drop to a frosty 8.2°C (46.8°F).Humidity
In September, the average relative humidity in Böllen is 82%.Rainfall
The month with the least rainfall in Böllen, Germany, is September, when the rain falls for 15.2 days and typically collects 49mm (1.93") of precipitation.Snowfall
January through May, September through December are months with snowfall in Böllen. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, there are 85.8 snowfall days, and 1921mm (75.63") of snow is accumulated.Daylight
In September, the average length of the day is 12h and 34min.On the first day of September, sunrise is at 06:47 and sunset at 20:09. On the last day of the month, sunrise is at 07:27 and sunset at 19:09 CEST.
Sunshine
In September, the average sunshine is 8.2h.UV index
In Böllen, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: An average UV index of 3 in September transforms into this advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Böllen, Germany
- Average high temperature in September: 18.4°C
The warmest months (with the highest average high temperature) are July and August (22.8°C).
The month with the lowest average high temperature is January (2.5°C).
- Average low temperature in September: 8.2°C
The months with the highest average low temperature are July and August (11.4°C).
The coldest month (with the lowest average low temperature) is February (-3.1°C).
Average pressure in September
Böllen, Germany
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.5mbar).
The month with the lowest atmospheric pressure is November (1015.6mbar).
Average wind speed in September
Böllen, Germany
- Average wind speed in September: 7.2km/h
The windiest months (with the highest average wind speed) are March and December (9.7km/h).
The calmest month (with the lowest average wind speed) is August (6.8km/h).
Average humidity in September
Böllen, Germany
- Average humidity in September: 82%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are April and July (79%).
Average rainfall in September
Böllen, Germany
- Average rainfall in September: 49mm
The wettest month (with the highest rainfall) is June (130mm).
The driest month (with the least rainfall) is September (49mm).
Average rainfall days in September
Böllen, Germany
- Average rainfall days in September: 15.2 days
The month with the highest number of rainy days is May (22.8 days).
The month with the least rainy days is February (5.6 days).
Average snowfall in September
Böllen, Germany
- Average snowfall in September: 1mm
The month with the highest snowfall is December (454mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Böllen, Germany
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is January (17.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Böllen, Germany
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The months with the least sunshine are January and December (Average sunshine: 3h and 48min).
Average sunshine days in September
Böllen, Germany
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is October (15.2 days).
The month with the least sunshine days is June (5.7 days).
Average UV index in September
Böllen, Germany
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in September
Böllen, Germany
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in September
Böllen, Germany
- Average visibility in September: 8km
The month with the highest visibility is July (9km).
The month with the lowest visibility is January (6km).
