The temperatures in Hennef in September are comfortable with low of 10°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Hennef during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Hennef in September 2026.
If you’re planning to visit Hennef in the near future, we highly recommend that you review the 14 day weather forecast for Hennef before you arrive.
Temperatures
21° / 10°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
46
mm
Sun Hours
10.2
Hrs
