Bonn, North Rhine-Westphalia Weather by Month and Climate Averages

How much rain does Bonn get?

Bonn gets 752 mm of precipitation in an average year, spread over about 170 days with measurable rain. That is more rainy days than 55% of Germany.

June is the wettest month, with 84 mm. April is the driest, with 45 mm. December has the most rainy days, about 17.

The longest dry spell in the last five years lasted 33 days, to June 17, 2023.

Bonn weather by month

Bonn weather in January

In January, Bonn averages a high of 6°C and a low of 1°C. It gets 55 mm of precipitation over about 16 rainy days. The sun is out about 23% of daylight hours. The January record high is 16°C (2023) and the record low is -17°C (2009).

Bonn weather in February

In February, Bonn averages a high of 7°C and a low of 1°C. It gets 47 mm of precipitation over about 15 rainy days. The sun is out about 28% of daylight hours. The February record high is 21°C (2019) and the record low is -16°C (2012).

Bonn weather in March

In March, Bonn averages a high of 11°C and a low of 2°C. It gets 52 mm of precipitation over about 15 rainy days. The sun is out about 38% of daylight hours. The March record high is 25°C (2021) and the record low is -12°C (2013).

Bonn weather in April

In April, Bonn averages a high of 16°C and a low of 5°C. It gets 45 mm of precipitation over about 12 rainy days. The sun is out about 40% of daylight hours. The April record high is 28°C (2018) and the record low is -5°C (2013).

Bonn weather in May

In May, Bonn averages a high of 19°C and a low of 9°C. It gets 69 mm of precipitation over about 13 rainy days. The sun is out about 37% of daylight hours. The May record high is 33°C (2005) and the record low is -2°C (2020). May is one of the most comfortable months to visit.

Bonn weather in June

In June, Bonn averages a high of 22°C and a low of 12°C. It gets 84 mm of precipitation over about 14 rainy days. The sun is out about 42% of daylight hours. The June record high is 38°C (2026) and the record low is 4°C (2006).

Bonn weather in July

In July, Bonn averages a high of 24°C and a low of 14°C. It gets 82 mm of precipitation over about 14 rainy days. The sun is out about 37% of daylight hours. The July record high is 41°C (2019) and the record low is 7°C (2015). July is one of the most comfortable months to visit.

Bonn weather in August

In August, Bonn averages a high of 24°C and a low of 13°C. It gets 77 mm of precipitation over about 13 rainy days. The sun is out about 41% of daylight hours. The August record high is 37°C (2003) and the record low is 5°C (2007). August is one of the most comfortable months to visit.

Bonn weather in September

In September, Bonn averages a high of 20°C and a low of 11°C. It gets 62 mm of precipitation over about 13 rainy days. The sun is out about 41% of daylight hours. The September record high is 33°C (2020) and the record low is 1°C (2018). September is one of the most comfortable months to visit.

Bonn weather in October

In October, Bonn averages a high of 15°C and a low of 7°C. It gets 61 mm of precipitation over about 14 rainy days. The sun is out about 27% of daylight hours. The October record high is 27°C (2023) and the record low is -6°C (2003).

Bonn weather in November

In November, Bonn averages a high of 10°C and a low of 4°C. It gets 59 mm of precipitation over about 15 rainy days. The sun is out about 26% of daylight hours. The November record high is 21°C (2014) and the record low is -7°C (2010).

Bonn weather in December

In December, Bonn averages a high of 6°C and a low of 2°C. It gets 59 mm of precipitation over about 17 rainy days. The sun is out about 19% of daylight hours. The December record high is 17°C (2022) and the record low is -16°C (2009).

Sunshine, humidity and wind in Bonn

June is the sunniest month in Bonn, with sunshine about 42% of daylight hours. December is the cloudiest, at 19%. Over the year the sun shines about 33% of daylight hours. Bonn is sunnier than 73% of Germany.

Humidity peaks in December at 86% and is lowest in June at 64%.

Bonn has about 5 days a year above 32°C. Bonn is hotter than 71% of Germany.

First and last freeze in Bonn

The first fall freeze in Bonn typically comes around November 10, and the last spring freeze around April 14. That leaves a frost-free growing season of about 210 days.

Bonn weather records

The hottest temperature on record at the Bonn station is 41°C, on July 25, 2019. The coldest is -17°C, on January 6, 2009.

The wettest day on record brought 88 mm of rain, on June 20, 1992.

39 all-time records have been set at the station since 1990.

The best time to visit Bonn

The most comfortable time to visit is typically May and July to September, when daytime highs sit near 22°C.

Winter (December–February) is chilly, with average highs around 6°C and lows near 1°C.

Spring (March–May) is mild, with average highs around 15°C and lows near 5°C.

Summer (June–August) is warm, with average highs around 24°C and lows near 13°C.

Autumn (September–November) is mild, with average highs around 15°C and lows near 7°C.

Bonn climate questions

How much rain does Bonn get?

Bonn gets 752 mm of precipitation in an average year, over about 170 rainy days.

What is the wettest month in Bonn?

June is the wettest month in Bonn, with 84 mm. April is the driest, with 45 mm.

How many rainy days does Bonn have a year?

Bonn has about 170 days with measurable rain in an average year. December has the most, about 17.

What is the hottest month in Bonn?

July is the warmest month in Bonn, with an average high of 24°C.

What is the coldest month in Bonn?

January is the coldest month in Bonn, with an average low of 1°C.

What is the record high temperature in Bonn?

The record high at the Bonn station is 41°C, set on July 25, 2019. The record low is -17°C, on January 6, 2009.

What is the sunniest month in Bonn?

June is the sunniest month in Bonn, with sunshine about 42% of daylight hours. December is the cloudiest.

When is the first frost in Bonn?

The first fall freeze in Bonn typically comes around November 10. The last spring freeze is around April 14.

What is the best time to visit Bonn?

The most comfortable time to visit is typically May and July to September, when daytime highs sit near 22°C.