Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
A minor decrease in the average high-temperature is observed during September, shifting from a pleasant 20.3°C (68.5°F) in August to a comfortable 16.9°C (62.4°F). A mean low-temperature of 12.3°C (54.1°F) is a distinguishing feature of September, indicating a slight dip from daytime highs.Humidity
The average relative humidity in September in Roskilde is 81%.Rainfall
In September, in Roskilde, the rain falls for 14.5 days. Throughout September, 28mm (1.1") of precipitation is accumulated. Throughout the year, in Roskilde, there are 166.6 rainfall days, and 341mm (13.43") of precipitation is accumulated.Snowfall
May through October are months without snowfall.Sea temperature
In Roskilde, in September, the average water temperature is 16.4°C (61.5°F).Note: Swimming in 16.4°C (61.5°F) is not an enjoyable experience for most. Breathing becomes progressively more challenging as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in September is 12h and 44min.On the first day of the month, sunrise is at 06:17 and sunset at 20:05. On the last day of September, in Roskilde, sunrise is at 07:13 and sunset at 18:49 CEST.
Sunshine
In Roskilde, Denmark, the average sunshine in September is 7.7h.UV index
In Roskilde, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the UV index of 4 transforms into the following advice:
Take precautions - Protection against skin and eye damage is obliged. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What are September temperatures in Roskilde?
What is the average humidity in September in Roskilde?
How much does it rain in Roskilde in September?
When it does not snow in Roskilde?
What is the sea temperature in September in Roskilde?
How many hours of daylight does Roskilde have in September?
When are sunrise and sunset in September in Roskilde?
How long on average sun shines in September in Roskilde?
What is the UV index intensity in September in Roskilde?
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).
The 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).
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).
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).
Average humidity in September
Roskilde, Denmark
- Average humidity in September: 81%
The months with the highest relative humidity are January, November and December (88%).
The months with the lowest relative humidity are April, May, June and July (77%).
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).
Average rainfall days in September
Roskilde, Denmark
- Average rainfall days in September: 14.5 days
The 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).
Average snowfall in September
Roskilde, Denmark
- Average snowfall in September: 0mm
The month with the highest snowfall is February (35mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
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).
Average daylight in September /
Average sunshine in September
Roskilde, Denmark
- Average daylight in September: 12h and 4min
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 12min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 0min).
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).
Average UV index in September
Roskilde, Denmark
- Average UV index in September: 4
The 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).
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).
Average visibility in September
Roskilde, Denmark
- Average visibility in September: 10km
The months with the highest visibility are April, June, August and September (10km).
The months with the lowest visibility are January, February, March, May, July, October, November and December (9km).
Roskilde, Denmark
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