Is Bonn hot in September?
Days are typically mild at 20°C, while nights average 10.2°C.
Germany · 1991–2020 normal
Bonn in
September.
Typical September weather in Bonn: 20°C by day, 10.2°C at night, 63 mm of rain over 9.3 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high20°C
Typical low10.2°C
Rain63 mm
Wet days9.3
In the year-round weather comparison, September scores 69 out of 100 (August leads the year at 84). Daylight is calculated as 12 h 33 from latitude 50.73°.
September at a glance
What is Bonn like in September?
Plain answers from the measured climate record—not a forecast or a promise about a particular trip.
Does it rain much?
The measured monthly average is 63 mm across about 9 wet days.
How much daylight is there?
There are about 12 h 33 between sunrise and sunset at mid-month, calculated from the place latitude.
Is September a good time to visit?
September ranks 4 of 12 in our weather comparison; August ranks first.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 2946447
- NOAA station
- GME00130990 · BONN-ROLEBER
- Station distance
- 6.9 km from the place centre
- Coverage
- Good coverage · 21 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Bonn is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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