September weather forecastMettmann, Germany
September
Weather in September
September, the first month of the autumn in Mettmann, is still a comfortable month, with temperature in the range of an average high of 19.2°C (66.6°F) and an average low of 11°C (51.8°F).Temperature
In Mettmann, entering September brings a subtle temperature decrement, reducing from August's warm 23.5°C (74.3°F) to a comfortable 19.2°C (66.6°F). Throughout the month of September, Mettmann observes an average nighttime temperature of 11°C (51.8°F).Humidity
In Mettmann, the average relative humidity in September is 77%.Rainfall
In September, the rain falls for 13 days. Throughout September, 29mm (1.14") of precipitation is accumulated. Throughout the year, there are 177.1 rainfall days, and 547mm (21.54") of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 06:46 and sunset at 20:17. On the last day of September, sunrise is at 07:31 and sunset at 19:11 CEST.
Sunshine
In Mettmann, the average sunshine in September is 8.3h.UV index
In Mettmann, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: A daily high UV index of 4 in September leads to these guidelines:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mettmann, Germany
- Average high temperature in September: 19.2°C
The warmest month (with the highest average high temperature) is July (23.6°C).
The month with the lowest average high temperature is January (4.2°C).
- Average low temperature in September: 11°C
The month with the highest average low temperature is August (14.5°C).
The coldest month (with the lowest average low temperature) is January (0.3°C).
Average pressure in September
Mettmann, Germany
- Average pressure in September: 1017.6mbar
The month with the highest atmospheric pressure is September (1017.6mbar).
The month with the lowest atmospheric pressure is November (1013.2mbar).
Average wind speed in September
Mettmann, Germany
- Average wind speed in September: 10km/h
The windiest month (with the highest average wind speed) is February (14.4km/h).
The calmest month (with the lowest average wind speed) is August (9.8km/h).
Average humidity in September
Mettmann, Germany
- Average humidity in September: 77%
The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (71%).
Average rainfall in September
Mettmann, Germany
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is December (67mm).
The driest month (with the least rainfall) is April (27mm).
Average rainfall days in September
Mettmann, Germany
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is February (12.1 days).
Average snowfall in September
Mettmann, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is January (76mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Mettmann, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.3 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
Mettmann, Germany
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 30min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days in September
Mettmann, Germany
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is April (15.2 days).
The month with the least sunshine days is December (9.8 days).
Average UV index in September
Mettmann, Germany
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Mettmann, Germany
- Average cloud cover in September: 40
The month with the most cloud cover is December (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in September
Mettmann, Germany
- Average visibility in September: 9km
The months with the highest visibility are March, April, May, June, July, August, September and October (9km).
The months with the lowest visibility are January, February, November and December (8km).
