Weather in Dortmund in September 2025
Average weather
Average temperature in Dortmund in September
The expected average maximum temperature in September is +75°F with a maximum of +90°F and a minimum of +46°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +66°F to +66°F.
Is Dortmund warm or cold in September?
Dortmund is typically mild in September.
Maximum temperatures go down compared to the previous month from +73°F to +66°F. The minimum temperature also goes down from +57°F to +52°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Dortmund:
Climate in Dortmund in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +73°F | +66°F | +57°F | ||||
| Min. temperature | ||||||
| +43°F | +36°F | +21°F | ||||
| Max. temperature | ||||||
| +97°F | +93°F | +81°F | ||||
| Rainfall | ||||||
| 84 mm | 76 mm | 77 mm | ||||
| Wind | ||||||
| 2 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 72% | 78% | 81% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 6 | 6 | 5 | ||||
| Cloudy days | ||||||
| 5 | 6 | 8 | ||||
| Rainy days | ||||||
| 19 | 18 | 18 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting colder in September. From +73°F in the day, the average maximum temperature lowers to +66°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 84 mm to 76 mm. Humidity rises from 72% to 78%. Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average. The amount of sunny days stay about the same, averaging 6 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Dortmund is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Dortmund?
Climate Change Over the Years
The climate in Dortmund in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1985 (+52°F) and the highest in 2022 (+61°F). The driest year was 2018 with only 627 mm of rainfall, and the wettest year was 2023 with 1615 mm.
FAQ
Is September a good time to visit Dortmund?
Can you sunbathe in Dortmund in September?
Is Dortmund rainy in September?
Is it sunny in Dortmund in September?
Other cities in Germany
Monthly weather in Dortmund
Source of the data
For this page, we’ve looked at the typical weather in Dortmund, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.