September weather forecastHennef, Germany
September
Weather in September
September, the first month of the autumn in Hennef, is still a comfortable month, with temperature in the range of an average low of 9.8°C (49.6°F) and an average high of 18.9°C (66°F).Temperature
Hennef experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a moderately hot 23.3°C (73.9°F) in August to a comfortable 18.9°C (66°F). Throughout September, Hennef witnesses a nighttime temperature average of 9.8°C (49.6°F).Humidity
In September, the average relative humidity is 78%.Rainfall
The months with the least rainfall are April and September Rain falls for 10.5 days and accumulates 17mm (0.67") of rain.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September in Hennef is 12h and 37min.On the first day of the month, sunrise is at 06:45 and sunset at 20:15. On the last day of September, in Hennef, sunrise is at 07:30 and sunset at 19:10 CEST.
Sunshine
In September, the average sunshine in Hennef is 8.4h.UV index
The average daily maximum UV index in September in Hennef is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hennef, Germany
- Average high temperature in September: 18.9°C
The warmest month (with the highest average high temperature) is July (23.5°C).
The month with the lowest average high temperature is January (4°C).
- Average low temperature in September: 9.8°C
The month with the highest average low temperature is August (13.3°C).
The coldest month (with the lowest average low temperature) is January (-0.3°C).
Average pressure in September
Hennef, Germany
- Average pressure in September: 1017.8mbar
The month with the highest atmospheric pressure is September (1017.8mbar).
The month with the lowest atmospheric pressure is November (1013.6mbar).
Average wind speed in September
Hennef, Germany
- Average wind speed in September: 9.1km/h
The windiest month (with the highest average wind speed) is February (12.8km/h).
The calmest month (with the lowest average wind speed) is August (8.9km/h).
Average humidity in September
Hennef, Germany
- Average humidity in September: 78%
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in September
Hennef, Germany
- Average rainfall in September: 17mm
The wettest month (with the highest rainfall) is August (33mm).
The driest months (with the least rainfall) are April and September (17mm).
Average rainfall days in September
Hennef, Germany
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is February (10.4 days).
Average snowfall in September
Hennef, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is February (35mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Hennef, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6 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
Hennef, 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 24min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days in September
Hennef, Germany
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is December (11.4 days).
Average UV index in September
Hennef, Germany
- Average UV index in September: 4
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
Hennef, 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 37).
Average visibility in September
Hennef, Germany
- Average visibility in September: 8km
The months with the highest visibility are March, April, May, June, July and August (9km).
The months with the lowest visibility are January, February, September, October, November and December (8km).
