Tønder Weather in September
What's the weather like in Tønder (South Denmark) in September 2025?
The climate in Tønder during September can be summarized as mild and a little damp.
September is in the fall / autumn in Tønder and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 17°C (62°F), whilst at night 10°C (49°F) is normal.
| Daytime temperature | 16.9°C 62.4°F |
|---|---|
| Nightly temperature | 9.5°C 49.1°F |
| Average temperature | 13.2°C 55.8°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 90 mm 3.5 ins |
| Rainy days | 18 days |
| Sea temperature | 16.8°C 62.3°F |
| Humidity | 85% |
| Windspeed | 18.7kph 12 mph |
On average September is the 3rd wettest month of the year in Tønder with around 90mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 18 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 Tønder
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 Tønder in September 2025.
Other monthly averages
Best places to visit in September
Tønder weather stats
| Hottest month: | August | 20°C 68°F |
|---|---|---|
| Driest month: | February | 43mm 1.7ins |
| Sunniest month: | May | 8hrs |
| Coldest month: | January | 2.4°C 36.3°F |
| Wettest month: | November | 97mm 3.8ins |
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