May weather forecast
Bonn, Germany

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A stand-alone ancient castle in Bonn, Germany, with an urban setting down below
A stand-alone ancient castle in Bonn, Germany, with an urban setting down below

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. The consistent rise in temperature is complemented by an increase in daylight hours. Generally, the weather remains moderate and pleasant, rendering May as an ideal month for outdoor activities and explorations.

Temperature

May brings an average high-temperature of an enjoyable 17.8°C (64°F), nearly identical to the preceding month. During the month of May, an average low-temperature of 7.7°C (45.9°F) is recorded.

Humidity

In May, the average relative humidity in Bonn, Germany, is 76%.

Rainfall

In Bonn, Germany, in May, during 14.7 rainfall days, 30mm (1.18") of precipitation is typically accumulated. In Bonn, Germany, during the entire year, the rain falls for 156 days and collects up to 305mm (12.01") of precipitation.

Snowfall

In Bonn, snow does not fall in April through October.

Daylight

In May, the average length of the day is 15h and 32min.
On the first day of May, sunrise is at 06:04 and sunset at 20:52. On the last day of the month, sunrise is at 05:24 and sunset at 21:34 CEST.

Sunshine

The average sunshine in May in Bonn is 9h.

UV index

The average daily maximum UV index in May in Bonn is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 4 in May converts into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Frequently asked questions

What is the temperature in May in Bonn?

The average high-temperature, in May, in Bonn, is 17.8°C (64°F), while the average low-temperature is 7.7°C (45.9°F).

What is the average humidity in May in Bonn?

The average relative humidity in May in Bonn, Germany, is 76%.

How much does it rain in Bonn in May?

In Bonn, in May, it is raining for 14.7 days, with typically 30mm (1.18") of accumulated precipitation.

When it does not snow in Bonn?

In Bonn, snow does not fall in April through October.

What is the average length of the day in May in Bonn?

The average day length in May in Bonn, Germany, is 15h and 32min.

When is the sunrise / sunset in May in Bonn?

In May, on the first day of the month, sunrise is at 06:04 and sunset at 20:52. On the last day of the month, in Bonn, sunrise is at 05:24 and sunset at 21:34 CEST.

How many hours of sunshine does Bonn have in May?

The average sunshine duration in May in Bonn is 9h.

How high is the UV index in May in Bonn?

In May, the average daily maximum UV index in Bonn is 4. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Bonn, Germany

Average temperature in May - Bonn, Germany
  • Average high temperature in May: 17.8°C

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).

  • Average low temperature in May: 7.7°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 in May
Bonn, Germany

Average pressure in May - Bonn, Germany
  • Average pressure in May: 1016.1mbar

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 in May
Bonn, Germany

Average wind speed in May - Bonn, Germany
  • Average wind speed in May: 9.9km/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 in May
Bonn, Germany

Average humidity in May - Bonn, Germany
  • Average humidity in May: 76%

The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are July and August (73%).

Average rainfall in May
Bonn, Germany

Average rainfall in May - Bonn, Germany
  • Average rainfall in May: 30mm

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 in May
Bonn, Germany

Average rainfall days in May - Bonn, Germany
  • Average rainfall days in May: 14.7 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 in May
Bonn, Germany

Average snowfall in May - Bonn, Germany
  • Average snowfall in May: 0mm

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 in May
Bonn, Germany

Average snowfall days in May - Bonn, Germany
  • Average snowfall days in May: 0 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 in May /
Average sunshine in May
Bonn, Germany

Average daylight in May / Average sunshine in May - Bonn, Germany
  • Average daylight in May: 15h and 3min

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 May: 9h and 0min

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 in May
Bonn, Germany

Average sunshine days in May - Bonn, Germany
  • Average sunshine days in May: 13.1 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 in May
Bonn, Germany

Average UV index in May - Bonn, Germany
  • Average UV index in May: 4

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 in May
Bonn, Germany

Average cloud cover in May - Bonn, Germany
  • Average cloud cover in May: 44

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 in May
Bonn, Germany

Average visibility in May - Bonn, Germany
  • Average visibility in May: 9km

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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