September weather forecastHerlev, Denmark
September
Weather in September
September in Herlev witnesses a slow and steady switch from summer warmth towards the cooler autumn season. The temperatures start to drop, and the city finds itself enveloped in a more soothing ambience. The drop in temperatures is paired with an increased rainfall of 29mm (1.14") spread over about fifteen days. Slightly greater cloud cover darkens the sky, signaling a fading summer. The average high temperature lowers to 16.5°C (61.7°F), signifying a departure from the warmth of August.Temperature
As August makes way for September, Herlev's average high-temperature eases from a pleasant 20.3°C (68.5°F) to a refreshing 16.5°C (61.7°F). During September, the nighttime temperatures in Herlev align closely with the daytime averages, measuring 13.2°C (55.8°F).Humidity
In Herlev, the average relative humidity in September is 78%.Rainfall
In September, in Herlev, the rain falls for 14.9 days. Throughout September, 29mm (1.14") of precipitation is accumulated. In Herlev, Denmark, during the entire year, the rain falls for 163.1 days and collects up to 345mm (13.58") of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September in Herlev, Denmark, is 12h and 44min.On the first day of the month, sunrise is at 06:16 and sunset at 20:04. On the last day of September, in Herlev, Denmark, sunrise is at 07:12 and sunset at 18:48 CEST.
Sunshine
In Herlev, the average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 4 in September leads to these guidelines:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Herlev, Denmark
- Average high temperature in September: 16.5°C
The warmest month (with the highest average high temperature) is August (20.3°C).
The month with the lowest average high temperature is February (2.7°C).
- Average low temperature in September: 13.2°C
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (0.1°C).
Average pressure in September
Herlev, Denmark
- Average pressure in September: 1015.2mbar
The month with the highest atmospheric pressure is April (1015.6mbar).
The month with the lowest atmospheric pressure is December (1011.1mbar).
Average wind speed in September
Herlev, Denmark
- Average wind speed in September: 18.6km/h
The windiest month (with the highest average wind speed) is December (22.1km/h).
The calmest month (with the lowest average wind speed) is July (15.4km/h).
Average humidity in September
Herlev, Denmark
- Average humidity in September: 78%
The months with the highest relative humidity are January and December (86%).
The months with the lowest relative humidity are April, May and June (75%).
Average rainfall in September
Herlev, Denmark
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is August (50mm).
The driest month (with the least rainfall) is April (13mm).
Average rainfall days in September
Herlev, Denmark
- Average rainfall days in September: 14.9 days
The month with the highest number of rainy days is August (17.3 days).
The month with the least rainy days is February (9.2 days).
Average snowfall in September
Herlev, Denmark
- Average snowfall in September: 0mm
The month with the highest snowfall is February (34mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Herlev, Denmark
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.1 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
Herlev, Denmark
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 24min).
The month with the shortest days is December (Average daylight: 7h and 6min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 6min).
Average sunshine days in September
Herlev, Denmark
- Average sunshine days in September: 10.8 days
The month with the most sunshine days is April (16.5 days).
The month with the least sunshine days is December (9.1 days).
Average UV index in September
Herlev, Denmark
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Herlev, Denmark
- Average cloud cover in September: 45
The month with the most cloud cover is December (Cloud cover 70).
The months with the least cloud cover are June and August (Cloud cover 38).
Average visibility in September
Herlev, Denmark
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, November and December (9km).
