September weather forecast
Roskilde, Denmark

Weather in September

September, the first month of the autumn, in Roskilde, is still a comfortable month, with temperature in the range of an average high of 16.9°C (62.4°F) and an average low of 12.3°C (54.1°F).

Temperature

In Roskilde, the average high-temperature slightly decreases, from an agreeable 20.3°C (68.5°F) in August, to a comfortable 16.9°C (62.4°F). The average low-temperature, in Roskilde, is 12.3°C (54.1°F).

Humidity

In September, the average relative humidity in Roskilde is 81%.

Rainfall

In Roskilde, during 14.5 rainfall days, 28mm (1.1") of precipitation is typically accumulated. In Roskilde, during the entire year, the rain falls for 166.6 days and collects up to 341mm (13.43") of precipitation.

Snowfall

In Roskilde, Denmark, snow does not fall in May through October.

Sea temperature

In Roskilde, the average water temperature is 16.4°C (61.5°F).
Note: For most, swimming in 16.4°C (61.5°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 Roskilde is 12.7h.

Sunshine

In September, the average sunshine is 7.7h.

UV index

In Roskilde, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the average humidity in September in Roskilde?

The average relative humidity in September is 81%.

How much does it rain in Roskilde in September?

In Roskilde, Denmark, in September, during 14.5 rainfall days, 28mm (1.1") of precipitation is typically accumulated.

When it does not snow in Roskilde?

In Roskilde, Denmark, snow does not fall in May through October.

What is the sea water temperature in September in Roskilde?

In Roskilde, the average seawater temperature in September is 16.4°C (61.5°F). Swimming in 16.4°C (61.5°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 Roskilde?

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

How long on average sun shines in September in Roskilde?

In September, the average sunshine is 7.7h.

How high is the UV index in September in Roskilde?

In September, the average daily maximum UV index in Roskilde is 4. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Roskilde, Denmark

Average temperature in September - Roskilde, Denmark
  • Average high temperature in September: 16.9°C

The warmest month (with the highest average high temperature) is July (20.4°C).
Months with the lowest average high temperature are January and February (2.8°C).

  • Average low temperature in September: 12.3°C

The month with the highest average low temperature is August (14.9°C).
The coldest month (with the lowest average low temperature) is February (-0.6°C).

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Average pressure in September
Roskilde, Denmark

Average pressure in September - Roskilde, Denmark
  • Average pressure in September: 1015.3mbar

The month with the highest atmospheric pressure is April (1015.6mbar).
The month with the lowest atmospheric pressure is December (1011.2mbar).

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Average wind speed in September
Roskilde, Denmark

Average wind speed in September - Roskilde, Denmark
  • Average wind speed in September: 16km/h

The windiest month (with the highest average wind speed) is December (19.1km/h).
The calmest month (with the lowest average wind speed) is July (13.9km/h).

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Average humidity in September
Roskilde, Denmark

Average humidity in September - Roskilde, Denmark
  • Average humidity in September: 81%

Months with the highest relative humidity are January, November and December (88%).
Months with the lowest relative humidity are April, May, June and July (77%).

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Average rainfall in September
Roskilde, Denmark

Average rainfall in September - Roskilde, Denmark
  • Average rainfall in September: 28mm

The wettest month (with the highest rainfall) is August (45mm).
The driest month (with the least rainfall) is April (17mm).

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Average rainfall days in September
Roskilde, Denmark

Average rainfall days in September - Roskilde, Denmark
  • Average rainfall days in September: 14.5 days

Months with the highest number of rainy days are July and August (16.9 days).
The month with the least rainy days is February (9.1 days).

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Average snowfall in September
Roskilde, Denmark

Average snowfall in September - Roskilde, Denmark
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (35mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in September
Roskilde, Denmark

Average snowfall days in September - Roskilde, Denmark
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.3 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Roskilde, Denmark

Average sea temperature in September - Roskilde, Denmark
  • Average sea temperature in September: 16.4°C

The best month for swimming (with the highest average sea temperature) is August (18.4°C).
The coldest month (with the lowest average sea temperature) is February (2.1°C).

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Average daylight in September /
Average sunshine in September
Roskilde, Denmark

Average daylight in September / Average sunshine in September - Roskilde, Denmark
  • Average daylight in September: 12.7h

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

  • Average sunshine in September: 7.7h

The month with the most sunshine is August (Average sunshine: 9.4h).
The month with the least sunshine is December (Average sunshine: 3h).

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Average sunshine days in September
Roskilde, Denmark

Average sunshine days in September - Roskilde, Denmark
  • Average sunshine days in September: 11.5 days

The month with the most sunshine days is April (14.6 days).
The month with the least sunshine days is August (9.8 days).

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Average UV index in September
Roskilde, Denmark

Average UV index in September - Roskilde, Denmark
  • Average UV index in September: 4

Months with the highest UV index are July and August (UV index 5).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in September
Roskilde, Denmark

Average cloud cover in September - Roskilde, Denmark
  • Average cloud cover in September: 47

The month with the most cloud cover is December (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 39).

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Average visibility in September
Roskilde, Denmark

Average visibility in September - Roskilde, Denmark
  • Average visibility in September: 10km

Months with the highest visibility are April, June, August and September (10km).
Months with the lowest visibility are January, February, March, May, July, October, November and December (9km).

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