Arnsberg Weather in September
What's the weather like in Arnsberg (North Rhine-Westphalia) in September 2025?
The climate in Arnsberg during September can be summarized as mild and reasonably dry.
September is in the fall / autumn in Arnsberg and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 18°C (64°F), whilst at night 9°C (49°F) is normal.
| Daytime temperature | 17.8°C 64°F |
|---|---|
| Nightly temperature | 9.3°C 48.7°F |
| Average temperature | 13.5°C 56.3°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 65 mm 2.5 ins |
| Rainy days | 15 days |
| Sea temperature | 18.1°C 64.6°F |
| Humidity | 79% |
| Windspeed | 10.8kph 7 mph |
On average September is the 6th driest month of the year in Arnsberg with around 65mm 2.5 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 Arnsberg
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 Arnsberg in September 2025.
Other monthly averages
Best places to visit in September
Arnsberg weather stats
| Hottest month: | July | 20.9°C 69.6°F |
|---|---|---|
| Driest month: | February | 53mm 2.1ins |
| Sunniest month: | August | 6.7hrs |
| Coldest month: | January | 2.2°C 36°F |
| Wettest month: | July | 85mm 3.3ins |
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