Bonn, Germany Climate & Monthly Averages
Bonn has an oceanic climate. August is the hottest month, averaging 77° by day; January is the coldest at 43°.
How weather changes through the year in Bonn
Expect mild temperatures year-round with regular rainfall in Bonn: that is what an oceanic climate means in practice. Highs peak at 77°F (25°C) in August and fall to 43°F (6°C) by January, with 7.7 hours of sun on an average day.
Bonn climate quick facts
- Hottest month: August - highs near 77°F (25°C)
- Coldest month: January - highs near 43°F (6°C)
- Decade extremes (2015-2024): 101°F (39°C) high · 15°F (-10°C) low
- Wettest month: January (17 rainy days) · Sunniest: June (11.1 h sun/day)
- Climate type: oceanic
- Annual swing: 16°C between the average warmest and coolest month · day to night: 8°C
- Snow: about 6 days a year
- Average humidity: 75%
Temperatures, rain and sunshine
Warmth peaks in August: highs of 77°F (25°C), lows of 60°F (15°C). January sits at the other end of the year: 43°F (6°C) by day, 34°F (1°C) at night. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 101°F (39°C) and the lowest daily minimum 15°F (-10°C). January is the wettest month at 3.1 inches (80 mm) over 17 days; April is the driest.
Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is June through September. Sunshine averages 7.7 hours a day over the year - duller than about 89% of the cities we track, peaking in June at 11.1 hours. Snow falls on roughly 6 days a year, mostly November through April.
Where Bonn sits among other climates
- 28% of the year's precipitation falls in its wettest three months - more evenly spread than almost every other city we track.
These comparisons use the same ten-year window for every city in the dataset.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 43° | 34° | 17 | 3.1 in | 3.7 h/day | 8.4 h | 54% | 83% |
| February | 47° | 35° | 12 | 2.5 in | 5.6 h/day | 9.9 h | 42% | 78% |
| March | 52° | 37° | 14 | 2.9 in | 7.1 h/day | 11.7 h | 45% | 75% |
| April | 58° | 41° | 11 | 2.1 in | 9.4 h/day | 13.7 h | 38% | 71% |
| May | 66° | 49° | 13 | 2.7 in | 10.8 h/day | 15.5 h | 41% | 71% |
| June | 74° | 57° | 12 | 2.9 in | 11.1 h/day | 16.5 h | 40% | 69% |
| July | 76° | 59° | 12 | 3.1 in | 11.1 h/day | 16.1 h | 39% | 67% |
| August | 77° | 60° | 12 | 2.8 in | 10.5 h/day | 14.5 h | 37% | 69% |
| September | 70° | 53° | 10 | 2.9 in | 9.2 h/day | 12.5 h | 34% | 73% |
| October | 60° | 48° | 13 | 2.6 in | 6.0 h/day | 10.6 h | 43% | 80% |
| November | 50° | 41° | 14 | 3.0 in | 4.4 h/day | 8.9 h | 46% | 84% |
| December | 46° | 37° | 16 | 3.1 in | 3.1 h/day | 8.0 h | 51% | 85% |
Bonn month by month
Each card shows the average high and low. The bar places that month between Bonn's coldest night and warmest afternoon.
January
- Rain
- 17 days
- Sunshine
- 3.7 h
- Daylight
- 8.4 h
- Snow
- 3 days
February
- Rain
- 12 days
- Sunshine
- 5.6 h
- Daylight
- 9.9 h
- Snow
- 1 day
March
- Rain
- 14 days
- Sunshine
- 7.1 h
- Daylight
- 11.7 h
April
- Rain
- 11 days
- Sunshine
- 9.4 h
- Daylight
- 13.7 h
May
- Rain
- 13 days
- Sunshine
- 10.8 h
- Daylight
- 15.5 h
June
- Rain
- 12 days
- Sunshine
- 11.1 h
- Daylight
- 16.5 h
July
- Rain
- 12 days
- Sunshine
- 11.1 h
- Daylight
- 16.1 h
August
- Rain
- 12 days
- Sunshine
- 10.5 h
- Daylight
- 14.5 h
September
- Rain
- 10 days
- Sunshine
- 9.2 h
- Daylight
- 12.5 h
October
- Rain
- 13 days
- Sunshine
- 6.0 h
- Daylight
- 10.6 h
November
- Rain
- 14 days
- Sunshine
- 4.4 h
- Daylight
- 8.9 h
December
- Rain
- 16 days
- Sunshine
- 3.1 h
- Daylight
- 8.0 h
Looking for warmer alternatives? Browse warm places by month, or compare Bonn's coolest part of the year: January, December, February.
A season-by-season guide to Bonn
Spring (March through May)
Spring runs cool rather than cold here - highs near 59°F (15°C), nights near 42°F (6°C), and rain falls on around 38 of the 90 days.
Summer (June through August)
Summer in Bonn settles into easy warmth, with daytime highs averaging 75°F (24°C) and nights around 58°F (15°C); rain falls on around 35 of the 90 days. Daylight is generous - around 10.9 hours of sun a day.
Fall (September through November)
Fall in Bonn is crisp but comfortable, with daytime highs averaging 60°F (16°C) and nights around 47°F (9°C); rain falls on around 37 of the 90 days.
Winter (December through February)
Through winter, Bonn is chilly: 45°F (7°C) by day, 36°F (2°C) after dark, and rain falls on around 44 of the 90 days, plus about 5 snowy days.
Questions people ask about Bonn's climate
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The most useful weather window for Bonn
Best time to visit Bonn
Aim for June to September if you get the choice: warm days, manageable rainfall and plenty of daylight line up, and highs average 74°F (23°C) against roughly 11 wet days a month. For the same question asked the other way round, see where else is warm in June.
What to pack
Pack for Bonn with a warm jacket and layers for the cooler season and proper waterproofs rather than an umbrella - wet days are the norm here. Even in August, lows of 60°F (15°C) make an extra layer worth the space.
Bonn temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.