Climate averages 1991–2020
Bonn weather
in August.
A warm, moderately wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Bonn: daytime highs average 23.2°C and nights cool to about 14.6°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 78 mm of rain on roughly 12 days, which makes August a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 32 min on an average August day.
The nearest other city in this atlas is Troisdorf (9 km away). In August its highs average 23.0°C, about as warm as Bonn, with 81 mm of rain.
Among the 120 cities listed in Germany, Bonn ranks joint 42nd of 120 for the warmest August highs and joint 65th of 120 for the driest August (rainfall, lowest first). The mean August high of those 120 cities is 22.9°C; Bonn is 0.3°C warmer than that mean.
From August to September, average highs fall by 3.9°C to 19.3°C, and monthly rainfall falls from 78 mm to 62 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bonn climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.4°C0.7°C | 0.7°C | 63 | 13.1 | 8.59 h |
| February | 6.6°C0.7°C | 0.7°C | 55 | 11.5 | 10.010 h |
| March | 10.3°C2.5°C | 2.5°C | 59 | 12.8 | 11.812 h |
| April | 14.5°C5.3°C | 5.3°C | 48 | 10.4 | 13.814 h |
| May | 18.3°C9.3°C | 9.3°C | 61 | 11.6 | 15.515 h |
| June | 21.3°C12.5°C | 12.5°C | 71 | 11.8 | 16.416 h |
| July | 23.4°C14.8°C | 14.8°C | 74 | 12.6 | 16.016 h |
| August, selected | 23.2°C14.6°C | 14.6°C | 78 | 11.8 | 14.515 h |
| September | 19.3°C11.5°C | 11.5°C | 62 | 10.5 | 12.713 h |
| October | 14.5°C8.3°C | 8.3°C | 65 | 11.6 | 10.811 h |
| November | 9.3°C4.6°C | 4.6°C | 66 | 12.7 | 9.09 h |
| December | 6.0°C1.7°C | 1.7°C | 75 | 14.9 | 8.18 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Troisdorf in AugustGermany · 9 kmHigh 23.0°C · Low 14.6°C · 81 mm rain
- Köln in AugustGermany · 24 kmHigh 22.9°C · Low 14.4°C · 80 mm rain
- Bergisch Gladbach in AugustGermany · 28 kmHigh 22.8°C · Low 14.6°C · 87 mm rain
- Leverkusen in AugustGermany · 34 kmHigh 23.1°C · Low 14.8°C · 80 mm rain
- Düren in AugustGermany · 43 kmHigh 22.4°C · Low 14.0°C · 79 mm rain
- Solingen in AugustGermany · 49 kmHigh 21.7°C · Low 13.9°C · 94 mm rain
- Remscheid in AugustGermany · 50 kmHigh 21.0°C · Low 13.2°C · 99 mm rain
- Koblenz in AugustGermany · 54 kmHigh 23.5°C · Low 14.7°C · 59 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Bonn) is explained once on the Bonn year overview and on the Sources, method and limits page.