September weather forecastDortmund, Germany
September
Weather in September
September brings noticeable change in Dortmund's weather, signaling the start of the autumn season. The intensity of the summer heat lessens, replaced with more moderate temperatures and shorter periods of daylight. As the tree leaves start turning into shades of red and gold, the city bathes in an array of autumn colors, creating a picturesque sight. Occasional rainfall introduces a soothing contrast to the encroaching cool weather. Overall, the month of September offers a beautiful blend of late summer warmth and the cool onset of fall.Temperature
Dortmund's weather subtly changes with the onset of September, barely falling from a warm 23.6°C (74.5°F) in August to a comfortable 19.1°C (66.4°F). During September, Dortmund's temperature averages to a fresh 11.3°C (52.3°F) at night.Humidity
In September, the average relative humidity is 76%.Rainfall
In Dortmund, in September, it is raining for 14.6 days, with typically 35mm (1.38") of accumulated precipitation. In Dortmund, during the entire year, the rain falls for 199.5 days and collects up to 608mm (23.94") of precipitation.Snowfall
In Dortmund, Germany, snow does not fall in May through October.Daylight
In September, the average length of the day in Dortmund is 12h and 38min.On the first day of September, sunrise is at 06:43 and sunset at 20:16. On the last day of the month, sunrise is at 07:30 and sunset at 19:09 CEST.
Sunshine
In September, the average sunshine in Dortmund, Germany, is 8.1h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. 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
Dortmund, Germany
- Average high temperature in September: 19.1°C
The warmest month (with the highest average high temperature) is August (23.6°C).
The month with the lowest average high temperature is January (3.9°C).
- Average low temperature in September: 11.3°C
The month with the highest average low temperature is August (14.5°C).
The coldest month (with the lowest average low temperature) is January (0.1°C).
Average pressure in September
Dortmund, Germany
- Average pressure in September: 1017.6mbar
The month with the highest atmospheric pressure is September (1017.6mbar).
The month with the lowest atmospheric pressure is November (1013.1mbar).
Average wind speed in September
Dortmund, Germany
- Average wind speed in September: 10.7km/h
The windiest month (with the highest average wind speed) is December (16km/h).
The calmest month (with the lowest average wind speed) is August (10.5km/h).
Average humidity in September
Dortmund, Germany
- Average humidity in September: 76%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is August (70%).
Average rainfall in September
Dortmund, Germany
- Average rainfall in September: 35mm
The wettest month (with the highest rainfall) is December (71mm).
The driest month (with the least rainfall) is April (31mm).
Average rainfall days in September
Dortmund, Germany
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (14.3 days).
Average snowfall in September
Dortmund, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is January (71mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Dortmund, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Dortmund, Germany
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 8h and 6min
The month with the most sunshine is August (Average sunshine: 9h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in September
Dortmund, Germany
- Average sunshine days in September: 11.8 days
The month with the most sunshine days is October (12.8 days).
The month with the least sunshine days is December (7.7 days).
Average UV index in September
Dortmund, Germany
- 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, November and December (UV index 2).
Average cloud cover in September
Dortmund, Germany
- Average cloud cover in September: 44
The month with the most cloud cover is December (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in September
Dortmund, Germany
- Average visibility in September: 9km
The months with the highest visibility are March, April, May, June, July, August and September (9km).
The months with the lowest visibility are January, February, October, November and December (8km).
