Copenhagen
Denmark
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Copenhagen, Denmark

Ships docked in the Nyhavn District harbor of Copenhagen, Denmark, on a sunny morning
Ships docked in the Nyhavn District harbor of Copenhagen, Denmark, on a sunny morning
The first month of the autumn, September, is still a comfortable month in Copenhagen, Denmark, with average temperature varying between 9.7°C (49.5°F) and 16.7°C (62.1°F).

Temperature

In Copenhagen, the average high-temperature in September slightly decreases, from a pleasant 21°C (69.8°F) in August, to an enjoyable 16.7°C (62.1°F). The average low-temperature, in September, is 9.7°C (49.5°F).

Humidity

The average relative humidity in Copenhagen, Denmark, is 78%.

Rainfall

September is the month with the most rainfall. Rain falls for 13.6 days and accumulates 58.9mm (2.3") of precipitation.

Snowfall

In Copenhagen, it doesn't snow. In October, it regularly snows. In Copenhagen, Denmark, during the entire year, snow falls for 21.5 days.

Sea temperature

In Copenhagen, in September, the average water temperature is 16.3°C (61.3°F).
Note: For most, swimming in 16.3°C (61.3°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in Copenhagen is 12.7h.

Sunshine

In September, the average sunshine in Copenhagen is 5.1h.

UV index

In Copenhagen, Denmark, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Copenhagen?

In Copenhagen, in September, the average high-temperature is 16.7°C (62.1°F), and the average low-temperature is 9.7°C (49.5°F).

What is the average humidity in September in Copenhagen?

The average relative humidity in September in Copenhagen is 78%.

How much does it rain in Copenhagen in September?

In Copenhagen, during September, the rain falls for 13.6 days and regularly aggregates up to 58.9mm (2.3") of precipitation.

What is the wettest month in Copenhagen?

September is the month with the most rainfall. Rain falls for 13.6 days and accumulates 58.9mm (2.3") of precipitation.

Does it snow in Copenhagen in September?

In Copenhagen, Denmark, in September, it doesn't snow. In October, it regularly snows.

How cold is the water in September in Copenhagen?

In Copenhagen, Denmark, the average seawater temperature in September is 16.3°C (61.3°F). Swimming in 16.3°C (61.3°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in September in Copenhagen?

In Copenhagen, the average length of the day in September is 12.7h.

How long on average sun shines in September in Copenhagen?

In Copenhagen, the average sunshine in September is 5.1h.

How high is the UV index in September in Copenhagen?

In Copenhagen, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.
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%).
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 lowest rainfall) is February (22.7mm).

Average rainfall days in September - Copenhagen, Denmark
  • Average rainfall days in September: 13.6 days

Months with the highest number of rainy days are November and December (15.4 days).
The month with the lowest number of 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).
Months with the lowest number of 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: 12.7h

The month with the longest days is June (Average daylight: 17.4h).
The month with shortest days is December (Average daylight: 7.1h).

  • Average sunshine in September: 5.1h

The month with most sunshine is May (Average sunshine: 8.5h).
The month with least sunshine is December (Average sunshine: 1.2h).

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).
Months with the lowest UV index are January and December (UV index 0).