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Contents
- The climate of Bonn
- The best time to visit Bonn
- The worst time to visit Bonn
- Spring weather in Bonn
- Summer weather in Bonn
- Autumn weather in Bonn
- Winter weather in Bonn
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
A stand-alone ancient castle in Bonn, Germany, with an urban setting down below
The climate of Bonn
Bonn, situated in Western Germany, experiences a type of climate classified as Cfb by the Köppen climate classification system. This is also known as a marine climate, notable for mild summers and winters. As a city nestled on the banks of the Rhine River, Bonn features weather conditions defined by its geographical location, coupled with the influences from the temperate oceanic climate that is typical across western Europe.
Throughout the year, the climatological parameters in Bonn exhibit significant variation. The highest recorded temperatures average out at 23.5°C (74.3°F) in July, and reach their lowest in January at 4°C (39.2°F). The coldest temperatures also occur in winter months, specifically January, with a -0.3°C (31.5°F) average, warming up to an average of 13°C (55.4°F) during July and August nights.
There is a gradual humidity trail, highest in December with levels peaking at around 89%, then gradually plummeting to its lowest at 73% in July and August. The amount of rainfall, however, does not correspondingly follow this trend. The heaviest rainfall averages at 33mm (1.3") in August each year. An interesting observation is that after the wettest month, September has considerably lower rainfall at 17mm (0.67").
The city experiences a fair amount of snow too. January and December are the months with the greatest snowfall, with average levels reaching 25mm (0.98") and days of snowfall reaching 6 and 5.1 respectively. The season of winter, from late December until February, also brings along the shortest daylight hours in the year, lowest sunshine hours, and highest cloud coverage.
Throughout the year, the climatological parameters in Bonn exhibit significant variation. The highest recorded temperatures average out at 23.5°C (74.3°F) in July, and reach their lowest in January at 4°C (39.2°F). The coldest temperatures also occur in winter months, specifically January, with a -0.3°C (31.5°F) average, warming up to an average of 13°C (55.4°F) during July and August nights.
There is a gradual humidity trail, highest in December with levels peaking at around 89%, then gradually plummeting to its lowest at 73% in July and August. The amount of rainfall, however, does not correspondingly follow this trend. The heaviest rainfall averages at 33mm (1.3") in August each year. An interesting observation is that after the wettest month, September has considerably lower rainfall at 17mm (0.67").
The city experiences a fair amount of snow too. January and December are the months with the greatest snowfall, with average levels reaching 25mm (0.98") and days of snowfall reaching 6 and 5.1 respectively. The season of winter, from late December until February, also brings along the shortest daylight hours in the year, lowest sunshine hours, and highest cloud coverage.
The best time to visit Bonn
Preferring mild weather conditions with ample sunshine and relatively less rainfall is a key consideration when planning a trip to Bonn. In this aspect, the spring months starting from April till June offer moderate temperatures, varying from 15.1°C (59.2°F) to 21.3°C (70.3°F) and rainfall decreasing to 17mm (0.67") to 30mm (1.18"). Moreover, daylight hours increase significantly from 13.8 hours in April to 16.4 hours in June, with May and June experiencing a healthy average of 9 hours of daily sunshine.
The worst time to visit Bonn
When analyzing the climatic parameters, the most challenging time to visit falls during the coldest months. Unfortunately, these coincide with the highest snowfall and lowest daylight hours, and they happen to be December through February. It has been observed that these months experience lower visibility, with an average of 8km (5mi). The freezing weather accompanied by shorter days makes outdoor sightseeing a challenging task and overall less enjoyable.
Spring weather in Bonn
Springtime is an enjoyable period in Bonn, with weather transitioning from the freezing cold winter to a warmer and more vibrant season. During March, the daily high temperatures rise sharply, from 5.2°C (41.4°F) in February to 9.7°C (49.5°F) in March and continue to rise to 15.1°C (59.2°F) in April and reach 17.8°C (64°F) in May. The rainfall is varied during this period, with March receiving an average shower of 27mm (1.06"), April getting approximately 17mm (0.67"), and May averaging 30mm (1.18").
Summer weather in Bonn
The summer season in Bonn can be categorized by warm and humid weather. June marks the start of summer, and the city experiences its highest atmospheric temperatures during this period, reaching up to 21.3°C (70.3°F) in June, peaking at 23.5°C (74.3°F) in July, and settling back to 23.3°C (73.9°F) in August. Rainfall remains fairly constant at 30mm (1.18") in both June and July but rises slightly to 33mm (1.3") in August.
Autumn weather in Bonn
Autumn months of September through November, or fall as some might refer to it, bring in cooler weather following the warm summer. In September, average temperatures typically decrease to 18.9°C (66°F), then further drop to 14°C (57.2°F) in October and 8.9°C (48°F) in November. Rainfall decreases to 17mm (0.67") in September, increases to 27mm (1.06") in October, and then lowers slightly to 23mm (0.91") in November.
Winter weather in Bonn
Winter in Bonn is characterized by a chill in the air with average temperatures dropping to 5.4°C (41.7°F) in December, down to 4°C (39.2°F) in January and gradually warming up to 5.2°C (41.4°F) in February. Rainfall remains quite high during these months, with December receiving an average of 29mm (1.14") of rain, January 22mm (0.87") and February receiving equal amount as January. These conditions, along with the fact that December and January are the snowiest months with average snowfall of 25mm (0.98"), make outdoor activities quite limited during the winter months.
Weather in January
The weather in Bonn, Germany, during the month of January is generally cold and harsh. With an average high temperature of 4°C (39.2°F) and a low of -0.3°C (31.5°F), visitors and residents should expect chilly days and freezing nights. Weather in January »
Weather in February
The climate in Bonn begins to transition in February as it strides towards the arrival of Spring. The average temperatures start to climb slightly, however, the weather remains predominantly cold. The city often receives a fresh coat of snow, although the frequency of snowfall decreases compared to January. Weather in February »
Weather in March
March brings more noticeable signs of seasonal change in Bonn. The temperatures continue their upward trajectory, and the days continue to get longer, leading to increased daylight hours. The spring season officially commences during this month, bringing with it incremental warmth and greening landscapes. Weather in March »
Weather in April
Bonn, Germany, continues its gradual transition from winter to spring weather during the month of April. The climate is more temperate now, with the longer days and increased daylight hours enhancing the pleasant atmosphere. The frequency of rainfall decreases, but the city continues to receive rainy days approximately 12 times this month, ensuring that the greenery stays well-nourished. Weather in April »
Weather in May
With the arrival of May, Bonn moves on from the transitional spring period and embraces the warmer temperatures signifying the onset of Summer. The city's landscapes burst into full bloom further enhancing the visuals. Rainfall increases and the city receives rainfall on close to 15 days this month, ensuring the plenty of water supply for blossoming buds. Weather in May »
Weather in June
June marks the official arrival of Summer in Bonn, with balmy weather and longer sunny days. The rising temperatures create a vibrant atmosphere in the city, as people spend more time outdoors enjoying the sunshine. With an average high of 21.3°C (70.3°F), the city and its inhabitants make the most of sunny days in outdoor parks and cafes filled with sun seekers. Weather in June »
Weather in July
July is the warmest month in Bonn with temperatures rising to an average high of approximately 23.5°C (74.3°F). The city basks in the full glory of the summer sun, with the longest daylight hours of the year. Despite the high temperatures, rainfall maintains its presence though it varies hardly from the previous month. Weather in July »
Weather in August
The weather remains warm and welcoming in August in Bonn, Germany. There is a trivial diminution in the average temperature from July, but not enough to bring a significant change. Rainfall is slightly higher than in previous months, but it does nothing to dampen the spirits of Bonn's residents and visitors alike. Weather in August »
Weather in September
The climes in Bonn begin to cool down entering September, signaling the onset of the Autumn season. Temperatures slide down to more comfortable levels, providing relief from the scorching heat of the summer months. The frequency of rainfall subsides and the city witnesses showers less frequently than in August. Weather in September »
Weather in October
October witnesses a clear transition from the warm days of September to true Autumn in Bonn. The temperatures further descend, and a distinct chill permeates the air, especially during the evenings. Rain and clouds frequently mask the city's skies, adding to the somber tone typical of the Fall season. Weather in October »
Weather in November
As November checks in, Bonn, Germany prepares to bid farewell to Fall and welcome Winter. The city witnesses a significant drop in temperature, suggesting the arrival of colder days. Rainfall shrouds the city for a significant number of days, fueling the transformation from autumn scenery to a bare, winter canvas. Weather in November »
Weather in December
December marks the official arrival of winter in Bonn, and it brings with it all the indicators of a conventional European Winter. The temperatures continue to descend, reaching an average minimum of around 1.2°C (34.2°F). The city dresses itself with a white blanket of snow, particularly towards the end of the month. Weather in December »
[Resources]Frequently asked questions
What time of the year is the coldest in Bonn?
The coldest period in Bonn tends to be January, when average temperatures fluctuate between a high of 4°C (39.2°F) and a low of -0.3°C (31.5°F).
How many days does it rain in Bonn?
Throughout the year, there are 156 rainfall days, and 305mm (12.01") of precipitation is accumulated.
When does it snow in Bonn?
Months with snowfall in Bonn are January through March, November and December.
How much does it snow in Bonn?
In Bonn, during the entire year, snow falls for 19.5 days and aggregates up to 98mm (3.86") of snow.
What is the month with the lowest UV index in Bonn?
The months with the lowest UV index in Bonn, Germany, are January, February, November and December, with an average maximum UV index of 2.
What is the snowiest month in Bonn?
The month with the most snowfall in Bonn, Germany, is February, when snow falls for 5.3 days and typically aggregates up to 35mm (1.38") of snow.
What is the driest month in Bonn?
April and September are months with the least rain when the rain falls for 11.8 days and typically aggregates up to 17mm (0.67") of rain.
When it does not snow in Bonn?
April through October are months without snowfall in Bonn.
When are the longest days in Bonn?
The month with the longest days in Bonn is June, with an average of 16h and 24min of daylight.
What is the month with the highest UV index in Bonn?
The months with the highest UV index in Bonn are June and July, with an average maximum UV index of 5.
What month is the hottest in Bonn?
With average high and low temperatures of 23.5°C (74.3°F) and 13°C (55.4°F) respectively, July is Bonn's warmest month.
What are the least humid months in Bonn?
July and August, with an average relative humidity of 73%, are the least humid months.
What month has the most sunshine in Bonn?
The month with the most sunshine in Bonn is July, with an average of 9.9h of sunshine.
What is the wettest month in Bonn?
The month with the most rainfall is August, when the rain falls for 14.3 days and typically aggregates up to 33mm (1.3") of precipitation.
When is Daylight Saving Time (DST) in Bonn?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends in Bonn, Germany, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
What is the most humid month in Bonn?
December is the most humid month in Bonn, with an average relative humidity of 89%.
What is the month with the shortest days in Bonn?
With an average of 8h and 6min of daylight, December has the shortest days of the year.
What is the month with the least sunshine in Bonn?
The month with the least sunshine in Bonn is December, with an average of 3.8h of sunshine.
Average temperature
Bonn, Germany
The warmest month (with the highest average high temperature) is July (23.5°C).
The month with the lowest average high temperature is January (4°C).
The month with the highest average low temperature is August (13.3°C).
The coldest month (with the lowest average low temperature) is January (-0.3°C).
Average pressure
Bonn, Germany
- Average pressure in January:
1016.8mbar - Average pressure in February:
1015.9mbar - Average pressure in March:
1016.3mbar - Average pressure in April:
1015.8mbar - Average pressure in May:
1016.1mbar - Average pressure in June:
1016mbar
- Average pressure in July:
1015.5mbar - Average pressure in August:
1015.9mbar - Average pressure in September:
1017.8mbar - Average pressure in October:
1017.2mbar - Average pressure in November:
1013.6mbar - Average pressure in December:
1017.1mbar
The month with the highest atmospheric pressure is September (1017.8mbar).
The month with the lowest atmospheric pressure is November (1013.6mbar).
Average wind speed
Bonn, Germany
- Average wind speed in January:
12.4km/h - Average wind speed in February:
12.8km/h - Average wind speed in March:
12km/h - Average wind speed in April:
10.2km/h - Average wind speed in May:
9.9km/h - Average wind speed in June:
9.7km/h
- Average wind speed in July:
9.3km/h - Average wind speed in August:
8.9km/h - Average wind speed in September:
9.1km/h - Average wind speed in October:
10.5km/h - Average wind speed in November:
11.5km/h - Average wind speed in December:
12.5km/h
The windiest month (with the highest average wind speed) is February (12.8km/h).
The calmest month (with the lowest average wind speed) is August (8.9km/h).
Average humidity
Bonn, Germany
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall
Bonn, Germany
The wettest month (with the highest rainfall) is August (33mm).
The driest months (with the least rainfall) are April and September (17mm).
Average rainfall days
Bonn, Germany
- Average rainfall days in January:
12.6 days - Average rainfall days in February:
10.4 days - Average rainfall days in March:
13.6 days - Average rainfall days in April:
11.8 days - Average rainfall days in May:
14.7 days - Average rainfall days in June:
14.5 days
- Average rainfall days in July:
15.6 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
11.7 days - Average rainfall days in November:
12.7 days - Average rainfall days in December:
13.6 days
The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is February (10.4 days).
Average snowfall
Bonn, Germany
The month with the highest snowfall is February (35mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Bonn, Germany
- Average snowfall days in January:
6 days - Average snowfall days in February:
5.3 days - Average snowfall days in March:
2 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.8 days - Average snowfall days in December:
5.1 days
The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Bonn, Germany
- Average daylight in January:
8h and 4min - Average daylight in February:
10h and 1min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 3min - Average daylight in June:
16h and 2min
- Average daylight in July:
16h and 0min - Average daylight in August:
14h and 3min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
9h and 0min - Average daylight in December:
8h and 1min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 0min - Average sunshine in April:
9h and 0min - Average sunshine in May:
9h and 0min - Average sunshine in June:
9h and 2min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 2min - Average sunshine in October:
5h and 3min - Average sunshine in November:
4h and 4min - Average sunshine in December:
3h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days
Bonn, Germany
- Average sunshine days in January:
12.8 days - Average sunshine days in February:
11.5 days - Average sunshine days in March:
14 days - Average sunshine days in April:
15.8 days - Average sunshine days in May:
13.1 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
13 days - Average sunshine days in August:
13.1 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
14.1 days - Average sunshine days in December:
11.4 days
The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is December (11.4 days).
Average UV index
Bonn, Germany
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Bonn, Germany
The month with the most cloud cover is December (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility
Bonn, Germany
The months with the highest visibility are March, April, May, June, July and August (9km).
The months with the lowest visibility are January, February, September, October, November and December (8km).
Bonn, Germany
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