September weather forecastFrederikshavn, Denmark
September
Weather in September
As summer subsides, September introduces fall in Frederikshavn, with temperatures lowering to an average high of 15.9°C (60.6°F) and a low of 12.8°C (55°F). Rainfall totals start to decline, presenting relatively drier weather conditions. While the sea temperature begins to cool, it still maintains a comfortable temperature for water activities. However, the reduced daylight hours due to the approaching equinox indicate shorter days and longer nights. All in all, this time of year opens itself to the calming influence of autumn and the beautiful change of colors it brings to the landscape of Frederikshavn.Temperature
Frederikshavn experiences a minor change to a moderate 15.9°C (60.6°F) in average high-temperature during September, closely reflecting August. A modest nighttime temperature average of 12.8°C (55°F) characterizes September in Frederikshavn.Humidity
The average relative humidity in September in Frederikshavn is 78%.Rainfall
In Frederikshavn, during September, the rain falls for 11.2 days and regularly aggregates up to 20mm (0.79") of precipitation. In Frederikshavn, during the entire year, the rain falls for 135.8 days and collects up to 290mm (11.42") of precipitation.Snowfall
May through September are months without snowfall in Frederikshavn.Sea temperature
In September, the average sea temperature in Frederikshavn is 16.3°C (61.3°F).Note: Swimming in water at 16.3°C (61.3°F) is not a pleasurable experience for most. The task of managing breathing becomes more challenging as the water temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in September in Frederikshavn is 12h and 47min.On the first day of September in Frederikshavn, sunrise is at 06:20 and sunset at 20:15. On the last day of the month, sunrise is at 07:20 and sunset at 18:54 CEST.
Sunshine
The average sunshine in September is 7.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Frederikshavn, Denmark
- Average high temperature in September: 15.9°C
The warmest months (with the highest average high temperature) are July and August (18.8°C).
The month with the lowest average high temperature is February (2.8°C).
- Average low temperature in September: 12.8°C
The month with the highest average low temperature is August (15.1°C).
The coldest month (with the lowest average low temperature) is February (0.4°C).
Average pressure in September
Frederikshavn, Denmark
- Average pressure in September: 1013.7mbar
The month with the highest atmospheric pressure is April (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008.8mbar).
Average wind speed in September
Frederikshavn, Denmark
- Average wind speed in September: 21.3km/h
The windiest month (with the highest average wind speed) is December (25km/h).
The calmest month (with the lowest average wind speed) is June (17.7km/h).
Average humidity in September
Frederikshavn, Denmark
- Average humidity in September: 78%
The months with the highest relative humidity are January, February and November (83%).
The months with the lowest relative humidity are April, May and June (74%).
Average rainfall in September
Frederikshavn, Denmark
- Average rainfall in September: 20mm
The wettest month (with the highest rainfall) is August (37mm).
The driest month (with the least rainfall) is April (14mm).
Average rainfall days in September
Frederikshavn, Denmark
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is August (14.1 days).
The month with the least rainy days is February (7.6 days).
Average snowfall in September
Frederikshavn, Denmark
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (21mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Frederikshavn, Denmark
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Frederikshavn, Denmark
- Average sea temperature in September: 16.3°C
The best month for swimming (with the highest average sea temperature) is August (18.3°C).
The coldest month (with the lowest average sea temperature) is March (2.8°C).
Average daylight in September /
Average sunshine in September
Frederikshavn, Denmark
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 17h and 54min).
The month with the shortest days is December (Average daylight: 6h and 42min).
- Average sunshine in September: 7h and 42min
The month with the most sunshine is June (Average sunshine: 11h and 0min).
The months with the least sunshine are November and December (Average sunshine: 3h and 18min).
Average sunshine days in September
Frederikshavn, Denmark
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is April (18.3 days).
The month with the least sunshine days is December (11.7 days).
Average UV index in September
Frederikshavn, Denmark
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Frederikshavn, Denmark
- Average cloud cover in September: 46
The month with the most cloud cover is November (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in September
Frederikshavn, 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).
