September weather forecastCopenhagen, Denmark
September
Weather in September
September sees a dip in temperatures, with values as high as 16.7°C (62.1°F) in Copenhagen. The start of autumn brings in a refreshingly brisk climate, taking over from the heat of summer. The weather leans towards being cool and moist, with more rain than in the summer months. This change in weather presents a majestic transformation of the city's foliage into hues of red and orange.Temperature
Copenhagen's September weather features a light decline in high-temperatures, reducing from a pleasant 21°C (69.8°F) in August to a refreshing 16.7°C (62.1°F). Copenhagen's temperature tends to fall to an average low of 9.7°C (49.5°F) during the nights of September.Humidity
In Copenhagen, the average relative humidity in September is 78%.Rainfall
The month with the most rainfall is September, when the rain falls for 13.6 days and typically aggregates up to 59mm (2.32") of precipitation.Snowfall
In Copenhagen, snow does not fall in May through September.Sea temperature
In Copenhagen, Denmark, in September, the average water temperature is 16.3°C (61.3°F).Note: For the majority of people, swimming in water at 16.3°C (61.3°F) is not enjoyable. The challenge of controlling breathing escalates as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in September in Copenhagen is 12h and 44min.On the first day of September, sunrise is at 06:15 and sunset at 20:03. On the last day of the month, sunrise is at 07:11 and sunset at 18:47 CEST.
Sunshine
The average sunshine in September in Copenhagen, Denmark, is 5.1h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. 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
Copenhagen, Denmark
- Average high temperature in September: 16.7°C
The warmest month (with the highest average high temperature) is July (21.2°C).
The month with the lowest average high temperature is January (2.5°C).
- Average low temperature in September: 9.7°C
The month with the highest average low temperature is July (12.9°C).
The coldest month (with the lowest average low temperature) is February (-1.9°C).
Average humidity in September
Copenhagen, Denmark
- Average humidity in September: 78%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are May and June (72%).
Average rainfall in September
Copenhagen, Denmark
- Average rainfall in September: 58.9mm
The wettest month (with the highest rainfall) is September (58.9mm).
The driest month (with the least rainfall) is February (22.7mm).
Average rainfall days in September
Copenhagen, Denmark
- Average rainfall days in September: 13.6 days
The months with the highest number of rainy days are November and December (15.4 days).
The month with the least rainy days is May (10.8 days).
Average snowfall days in September
Copenhagen, Denmark
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Copenhagen, Denmark
- Average sea temperature in September: 16.3°C
The best month for swimming (with the highest average sea temperature) is August (17.8°C).
The coldest month (with the lowest average sea temperature) is February (2.3°C).
Average daylight in September /
Average sunshine in September
Copenhagen, 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: 5h and 6min
The month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 12min).
Average UV index in September
Copenhagen, Denmark
- Average UV index in September: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 0).
