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Bonn, North Rhine-Westphalia Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Bonn, North Rhine-Westphalia?
Bonn, North Rhine-Westphalia gets 752 mm of precipitation a year over about 170 rainy days. July is the warmest month (average high 24°C) and January the coldest (average low 1°C).
Oceanic climate
Bonn, North Rhine-Westphalia has warm summers and chilly winters. Daytime highs range from about 5°C in January to 24°C in July. June is usually the wettest month. The most comfortable time to visit is typically May and July to September, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 1° | 6° |
| Spring | Mar–May | 6° | 15° |
| Summer | Jun–Aug | 13° | 23° |
| Autumn | Sep–Nov | 7° | 15° |
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.
From October 2025 to September 2026 Bonn got 634 mm of rain, against a normal of 752 mm for those months. May 2026 had the most, with 102 mm.
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. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 42% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 19%. The annual cloud-cover estimate is 33% of daylight hours; it is not a measurement of sunshine duration. 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 72% 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
These records cover BONN-ROLEBER during 1990–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 88 mm of precipitation, 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 1° | 6° | 55 mm | 16 | 84% | 23% | 16° | -17° |
| February | 1° | 7° | 47 mm | 15 | 77% | 28% | 21° | -16° |
| March | 2° | 11° | 52 mm | 15 | 68% | 38% | 25° | -12° |
| April | 5° | 16° | 45 mm | 12 | 65% | 40% | 28° | -5° |
| May | 9° | 19° | 69 mm | 13 | 66% | 37% | 33° | -2° |
| June | 12° | 22° | 84 mm | 14 | 64% | 42% | 38° | 4° |
| July | 14° | 24° | 82 mm | 14 | 66% | 37% | 41° | 7° |
| August | 13° | 24° | 77 mm | 13 | 67% | 41% | 37° | 5° |
| September | 11° | 20° | 62 mm | 13 | 73% | 41% | 33° | 1° |
| October | 7° | 15° | 61 mm | 14 | 82% | 27% | 27° | -6° |
| November | 4° | 10° | 59 mm | 15 | 84% | 26% | 21° | -7° |
| December | 2° | 6° | 59 mm | 17 | 86% | 19% | 17° | -16° |
Station: BONN-ROLEBER, 7 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1990–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
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?
Within the available 1990–2026 station history, 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 estimated sunshine of 42% of daylight hours from ERA5 cloud cover. 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.