Herdecke Weather in September
What's the weather like in Herdecke (North Rhine-Westphalia) in September 2025?
The climate in Herdecke during September can be summarized as mild and reasonably dry.
September is in the fall / autumn in Herdecke and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 19°C (65°F), whilst at night 10°C (51°F) is normal.
| Daytime temperature | 18.5°C 65.3°F |
|---|---|
| Nightly temperature | 10.3°C 50.5°F |
| Average temperature | 14.4°C 57.9°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 67 mm 2.6 ins |
| Rainy days | 15 days |
| Sea temperature | 18°C 64.4°F |
| Humidity | 79% |
| Windspeed | 10.8kph 7 mph |
On average September is the 6th wettest month of the year in Herdecke with around 67mm 2.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 5 hours of sunshine per day.
September temperatures in Herdecke
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Herdecke in September 2025.
Other monthly averages
Best places to visit in September
Herdecke weather stats
| Hottest month: | July | 21.7°C 71.1°F |
|---|---|---|
| Driest month: | February | 52mm 2ins |
| Sunniest month: | August | 6.6hrs |
| Coldest month: | January | 3.4°C 38.1°F |
| Wettest month: | July | 85mm 3.3ins |
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