Bonn Weather in September
Bonn in September
The short of it: Bonn in September averages a high of 21 °C (69 °F) and a low of 11 °C (51 °F), with 58 mm (2.3 in) of rain and about 12 h 32 min of daylight. Rated 4 of 5 for a visit; the best months are April and June. Source: TerraClimate climate normals, 1991–2020.
Average high 21° · low 11° · rain 58 mm · daylight 12 h 32 min
✦✦✦✦ Recommended for a visit · best months: April & June
Thirty years of records give Bonn an average September high of 21°, a low of 11° and some 58 mm of rain. The year turns hard here: highs drop 4° from August to about 21°, with nights near 11°. Rain is modest, about 58 mm, the 7th wettest month.
The sun is up for about 12 h 32 min in mid-September, 119 minutes less than a month before.
For the traveller: pack light clothes and a jacket for the evening. The Almanac rates September 4 of 5 for a visit; the finest months here are April and June.
Against its neighbours, Bonn runs warmer than most and drier than most in September. Bornheim, 8 km to the WNW, sees much the same highs.
September in Bonn, by the numbers
- Warmth rank
- 4th warmest of 12
- Rain rank
- 7th wettest of 12
- Versus August
- 4° colder, 16 mm less rain
- Versus October
- 5° warmer
- Day–night spread
- 10°
- Snow season
- seldom any
- Daylight, mid-month
- 12 h 32 min
- Average wind
- 9 km/h
Neighbouring Towns
September averages · distance by the crow’s flight| Town | Distance | High | Low | Rain |
|---|---|---|---|---|
| BornheimNorth Rhine-Westphalia | 8 km WNW | 20° | 11° | 57 mm |
| Sankt AugustinNorth Rhine-Westphalia | 8 km ENE | 21° | 10° | 62 mm |
| TroisdorfNorth Rhine-Westphalia | 9 km NNE | 21° | 10° | 64 mm |
| Hennef (Sieg)North Rhine-Westphalia | 14 km ENE | 20° | 10° | 67 mm |
| BrühlNorth Rhine-Westphalia | 17 km NW | 20° | 11° | 58 mm |
| Porz am RheinNorth Rhine-Westphalia | 17 km N | 20° | 11° | 66 mm |
| RodenkirchenNorth Rhine-Westphalia | 19 km NNW | 20° | 11° | 65 mm |
| HürthNorth Rhine-Westphalia | 22 km NW | 20° | 11° | 59 mm |